merge: http://linuxtv.org/hg/~jfrancois/v4l-dvb/

From: Mauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

13 files changed, 1787 insertions, 65 deletions

diff --git a/linux/drivers/media/dvb/firewire/firedtv-avc.c b/linux/drivers/media/dvb/firewire/firedtv-avc.c
index d8dae2599..79fab477c 100644
--- a/linux/drivers/media/dvb/firewire/firedtv-avc.c
+++ b/linux/drivers/media/dvb/firewire/firedtv-avc.c
@@ -150,7 +150,7 @@ static void debug_fcp(const u8 *data, size_t length)
 		subunit_type = data[1] >> 3;
 		subunit_id = data[1] & 7;
 		op = subunit_type == 0x1e || subunit_id == 5 ? ~0 : data[2];
-		printk(KERN_INFO "%ssu=%x.%x l=%zu: %-8s - %s\n",
+		printk(KERN_INFO "%ssu=%x.%x l=%d: %-8s - %s\n",
 		       prefix, subunit_type, subunit_id, length,
 		       debug_fcp_ctype(data[0]),
 		       debug_fcp_opcode(op, data, length));
diff --git a/linux/drivers/media/dvb/frontends/Kconfig b/linux/drivers/media/dvb/frontends/Kconfig
index a206cee23..578b834bf 100644
--- a/linux/drivers/media/dvb/frontends/Kconfig
+++ b/linux/drivers/media/dvb/frontends/Kconfig
@@ -513,6 +513,13 @@ config DVB_LGS8GL5
 	help
 	  A DMB-TH tuner module. Say Y when you want to support this frontend.
 
+config DVB_LGS8GXX
+	tristate "Legend Silicon LGS8913/LGS8GL5/LGS8GXX DMB-TH demodulator"
+	depends on DVB_CORE && I2C
+	default m if DVB_FE_CUSTOMISE
+	help
+	  A DMB-TH tuner module. Say Y when you want to support this frontend.
+
 comment "Tools to develop new frontends"
 
 config DVB_DUMMY_FE
diff --git a/linux/drivers/media/dvb/frontends/Makefile b/linux/drivers/media/dvb/frontends/Makefile
index 65a336aa1..bc2b00abd 100644
--- a/linux/drivers/media/dvb/frontends/Makefile
+++ b/linux/drivers/media/dvb/frontends/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_DVB_TDA10048) += tda10048.o
 obj-$(CONFIG_DVB_TUNER_CX24113) += cx24113.o
 obj-$(CONFIG_DVB_S5H1411) += s5h1411.o
 obj-$(CONFIG_DVB_LGS8GL5) += lgs8gl5.o
+obj-$(CONFIG_DVB_LGS8GXX) += lgs8gxx.o
 obj-$(CONFIG_DVB_DUMMY_FE) += dvb_dummy_fe.o
 obj-$(CONFIG_DVB_AF9013) += af9013.o
 obj-$(CONFIG_DVB_CX24116) += cx24116.o
diff --git a/linux/drivers/media/dvb/frontends/lgs8gxx.c b/linux/drivers/media/dvb/frontends/lgs8gxx.c
new file mode 100644
index 000000000..1395f3b5b
--- /dev/null
+++ b/linux/drivers/media/dvb/frontends/lgs8gxx.c
@@ -0,0 +1,859 @@
+/*
+ *    Support for Legend Silicon DMB-TH demodulator
+ *    LGS8913, LGS8GL5
+ *    experimental support LGS8G42, LGS8G52
+ *
+ *    Copyright (C) 2007,2008 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)
+ *
+ *    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 <asm/div64.h>
+
+#include "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;
+
+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:off).");
+
+/* 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 (reg >= 0xC0)
+		msg.addr += 0x02;
+
+	if (debug >= 2)
+		printk(KERN_DEBUG "%s: reg=0x%02X, data=0x%02X\n",
+			__func__, reg, data);
+
+	ret = i2c_transfer(priv->i2c, &msg, 1);
+
+	if (ret != 1)
+		dprintk(KERN_DEBUG "%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 (reg >= 0xC0)
+		dev_addr += 0x02;
+	msg[1].addr =  msg[0].addr = dev_addr;
+
+	ret = i2c_transfer(priv->i2c, msg, 2);
+	if (ret != 2) {
+		dprintk(KERN_DEBUG "%s: error reg=0x%x, ret=%i\n",
+			__func__, reg, ret);
+		return -1;
+	}
+
+	*p_data = b1[0];
+	if (debug >= 2)
+		printk(KERN_DEBUG "%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 lgs8gxx_set_ad_mode(struct lgs8gxx_state *priv)
+{
+	const struct lgs8gxx_config *config = priv->config;
+	u8 if_conf;
+
+	if_conf = 0x10; /* AGC output on; */
+
+	if_conf |=
+		((config->ext_adc) ? 0x80 : 0x00) |
+		((config->if_neg_center) ? 0x04 : 0x00) |
+		((config->if_freq == 0) ? 0x08 : 0x00) | /* Baseband */
+		((config->ext_adc && config->adc_signed) ? 0x02 : 0x00) |
+		((config->ext_adc && 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 *= (u64)1 << 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);
+
+	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_set_mode_auto(struct lgs8gxx_state *priv)
+{
+	u8 t;
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913)
+		lgs8gxx_write_reg(priv, 0xC6, 0x01);
+
+	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 (priv->config->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);
+	}
+
+
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
+		/* 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)
+{
+	int ret = 0;
+	u8 t;
+
+	/* 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);
+
+	ret = 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;
+
+	ret = lgs8gxx_read_reg(priv, 0x4B, &t);
+	if (ret != 0)
+		return ret;
+
+	*locked = ((t & 0xC0) == 0xC0) ? 1 : 0;
+	return 0;
+}
+
+static int lgs8gxx_is_autodetect_finished(struct lgs8gxx_state *priv,
+					  u8 *finished)
+{
+	int ret = 0;
+	u8 t;
+
+	ret = lgs8gxx_read_reg(priv, 0xA4, &t);
+	if (ret != 0)
+		return ret;
+
+	*finished = ((t & 0x3) == 0x1) ? 1 : 0;
+
+	return 0;
+}
+
+static int lgs8gxx_autolock_gi(struct lgs8gxx_state *priv, u8 gi, u8 *locked)
+{
+	int err;
+	u8 ad_fini = 0;
+
+	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");
+	lgs8gxx_write_reg(priv, 0x04, gi);
+	lgs8gxx_soft_reset(priv);
+	msleep(50);
+	err = lgs8gxx_is_autodetect_finished(priv, &ad_fini);
+	if (err != 0)
+		return err;
+	if (ad_fini) {
+		err = lgs8gxx_is_locked(priv, locked);
+		if (err != 0)
+			return err;
+	}
+
+	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);
+	/* 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, &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, &locked);
+			if (err)
+				goto out;
+			if (locked)
+				goto locked;
+		}
+		tmp_gi = GI_595;
+		err = lgs8gxx_autolock_gi(priv, GI_595, &locked);
+		if (err)
+			goto out;
+		if (locked)
+			goto locked;
+	}
+
+locked:
+	if ((err == 0) && (locked == 1)) {
+		u8 t;
+
+		lgs8gxx_read_reg(priv, 0xA2, &t);
+		*detected_param = t;
+
+		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) {
+#if 0
+		/* Set auto guardinterval detection */
+		lgs8gxx_write_reg(priv, 0x03, 0x01);
+#endif
+		dprintk("lgs8gxx_auto_detect failed\n");
+	}
+
+	/* Apply detected parameters */
+	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
+		u8 inter_leave_len = detected_param & TIM_MASK ;
+		inter_leave_len = (inter_leave_len == TIM_LONG) ? 0x60 : 0x40;
+		detected_param &= CF_MASK | SC_MASK  | LGS_FEC_MASK;
+		detected_param |= inter_leave_len;
+	}
+	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;
+
+	ret = lgs8gxx_read_reg(priv, 0xC2, &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, 0xC2, t);
+	if (ret != 0)
+		return ret;
+
+	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);
+
+#if 0
+	/* set AGC ref */
+	/* TODO better set from configuration per hardware */
+	lgs8gxx_write_reg(priv, 0x2C, 0);
+	lgs8gxx_write_reg(priv, 0x2D, 0x18);
+	lgs8gxx_write_reg(priv, 0x2E, 0xA2);
+#endif
+
+	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);
+
+	/* 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);
+	if (config->prod != LGS8GXX_PROD_LGS8913)
+		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);
+}
+
+#if 0
+static int lgs8gxx_sleep(struct dvb_frontend *fe)
+{
+	dprintk("%s\n", __func__);
+
+	return 0;
+}
+#endif
+
+static int lgs8gxx_write(struct dvb_frontend *fe, 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 dvb_frontend_parameters *fe_params)
+{
+	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, fe_params);
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 0);
+	}
+
+	/* start auto lock */
+	lgs8gxx_auto_lock(priv);
+
+	msleep(10);
+
+	return 0;
+}
+
+static int lgs8gxx_get_fe(struct dvb_frontend *fe,
+			  struct dvb_frontend_parameters *fe_params)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	u8 t;
+#if 0
+	int translated_fec = FEC_1_2;
+#endif
+
+	dprintk("%s\n", __func__);
+
+	/* TODO: get real readings from device */
+	/* inversion status */
+	fe_params->inversion = INVERSION_OFF;
+
+	/* bandwidth */
+	fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
+
+
+	lgs8gxx_read_reg(priv, 0x7D, &t);
+#if 0
+	/* FEC. No exact match for DMB-TH, pick approx. value */
+	switch (t & LGS_FEC_MASK) {
+	case  LGS_FEC_0_4: /* FEC 0.4 */
+		translated_fec = FEC_1_2;
+		break;
+	case  LGS_FEC_0_6: /* FEC 0.6 */
+		translated_fec = FEC_2_3;
+		break;
+	case  LGS_FEC_0_8: /* FEC 0.8 */
+		translated_fec = FEC_5_6;
+		break;
+	default:
+		translated_fec = FEC_1_2;
+	}
+	fe_params->u.ofdm.code_rate_HP = translated_fec;
+	fe_params->u.ofdm.code_rate_LP = translated_fec;
+#endif
+	fe_params->u.ofdm.code_rate_HP = FEC_AUTO;
+	fe_params->u.ofdm.code_rate_LP = FEC_AUTO;
+
+	/* constellation */
+	switch (t & SC_MASK) {
+	case SC_QAM64:
+		fe_params->u.ofdm.constellation = QAM_64;
+		break;
+	case SC_QAM32:
+		fe_params->u.ofdm.constellation = QAM_32;
+		break;
+	case SC_QAM16:
+		fe_params->u.ofdm.constellation = QAM_16;
+		break;
+	case SC_QAM4:
+	case SC_QAM4NR:
+		fe_params->u.ofdm.constellation = QPSK;
+		break;
+	default:
+		fe_params->u.ofdm.constellation = QAM_64;
+	}
+
+	/* transmission mode */
+	fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
+
+	/* guard interval */
+	fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
+
+	/* hierarchy */
+	fe_params->u.ofdm.hierarchy_information = 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, fe_status_t *fe_status)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	s8 ret;
+	u8 t;
+
+	dprintk("%s\n", __func__);
+
+	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;
+
+	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 as 50\n");
+			*signal = 0x32;
+		} 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 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
+		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;
+
+	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 int lgs8gxx_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct lgs8gxx_state *priv = fe->demodulator_priv;
+	u8 r0, r1, r2, r3;
+	u32 total_cnt, err_cnt;
+
+	dprintk("%s\n", __func__);
+
+	lgs8gxx_write_reg(priv, 0xc6, 0x01);
+	lgs8gxx_write_reg(priv, 0xc6, 0x41);
+	lgs8gxx_write_reg(priv, 0xc6, 0x01);
+
+	msleep(200);
+
+	lgs8gxx_write_reg(priv, 0xc6, 0x81);
+	lgs8gxx_read_reg(priv, 0xd0, &r0);
+	lgs8gxx_read_reg(priv, 0xd1, &r1);
+	lgs8gxx_read_reg(priv, 0xd2, &r2);
+	lgs8gxx_read_reg(priv, 0xd3, &r3);
+	total_cnt = (r3 << 24) | (r2 << 16) | (r1 << 8) | (r0);
+	lgs8gxx_read_reg(priv, 0xd4, &r0);
+	lgs8gxx_read_reg(priv, 0xd5, &r1);
+	lgs8gxx_read_reg(priv, 0xd6, &r2);
+	lgs8gxx_read_reg(priv, 0xd7, &r3);
+	err_cnt = (r3 << 24) | (r2 << 16) | (r1 << 8) | (r0);
+	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 struct dvb_frontend_ops lgs8gxx_ops = {
+	.info = {
+		.name = "Legend Silicon LGS8913/LGS8GXX DMB-TH",
+		.type = FE_OFDM,
+		.frequency_min = 474000000,
+		.frequency_max = 858000000,
+		.frequency_stepsize = 10000,
+		.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,
+#if 0
+	.sleep = lgs8gxx_sleep,
+#endif
+	.write = lgs8gxx_write,
+	.i2c_gate_ctrl = lgs8gxx_i2c_gate_ctrl,
+
+	.set_frontend = lgs8gxx_set_fe,
+	.get_frontend = lgs8gxx_get_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;
+
+	return &priv->frontend;
+
+error_out:
+	dprintk("%s() error_out\n", __func__);
+	kfree(priv);
+	return NULL;
+
+}
+EXPORT_SYMBOL(lgs8gxx_attach);
+
+MODULE_DESCRIPTION("Legend Silicon LGS8913/LGS8GXX DMB-TH demodulator driver");
+MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
+MODULE_LICENSE("GPL");
diff --git a/linux/drivers/media/dvb/frontends/lgs8gxx.h b/linux/drivers/media/dvb/frontends/lgs8gxx.h
new file mode 100644
index 000000000..321d366a8
--- /dev/null
+++ b/linux/drivers/media/dvb/frontends/lgs8gxx.h
@@ -0,0 +1,90 @@
+/*
+ *    Support for Legend Silicon DMB-TH demodulator
+ *    LGS8913, LGS8GL5
+ *    experimental support LGS8G42, LGS8G52
+ *
+ *    Copyright (C) 2007,2008 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)
+ *
+ *    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.
+ *
+ */
+
+#ifndef __LGS8GXX_H__
+#define __LGS8GXX_H__
+
+#include <linux/dvb/frontend.h>
+#include <linux/i2c.h>
+
+#define LGS8GXX_PROD_LGS8913 0
+#define LGS8GXX_PROD_LGS8GL5 1
+#define LGS8GXX_PROD_LGS8G42 3
+#define LGS8GXX_PROD_LGS8G52 4
+#define LGS8GXX_PROD_LGS8G54 5
+
+struct lgs8gxx_config {
+
+	/* product type */
+	u8 prod;
+
+	/* the demodulator's i2c address */
+	u8 demod_address;
+
+	/* parallel or serial transport stream */
+	u8 serial_ts;
+
+	/* transport stream polarity*/
+	u8 ts_clk_pol;
+
+	/* transport stream clock gated by ts_valid */
+	u8 ts_clk_gated;
+
+	/* A/D Clock frequency */
+	u32 if_clk_freq; /* in kHz */
+
+	/* IF frequency */
+	u32 if_freq; /* in kHz */
+
+	/*Use External ADC*/
+	u8 ext_adc;
+
+	/*External ADC output two's complement*/
+	u8 adc_signed;
+
+	/*Sample IF data at falling edge of IF_CLK*/
+	u8 if_neg_edge;
+
+	/*IF use Negative center frequency*/
+	u8 if_neg_center;
+
+	/* slave address and configuration of the tuner */
+	u8 tuner_address;
+};
+
+#if defined(CONFIG_DVB_LGS8GXX) || \
+	(defined(CONFIG_DVB_LGS8GXX_MODULE) && defined(MODULE))
+extern struct dvb_frontend *lgs8gxx_attach(const struct lgs8gxx_config *config,
+					   struct i2c_adapter *i2c);
+#else
+static inline
+struct dvb_frontend *lgs8gxx_attach(const struct lgs8gxx_config *config,
+				    struct i2c_adapter *i2c) {
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_LGS8GXX */
+
+#endif /* __LGS8GXX_H__ */
diff --git a/linux/drivers/media/dvb/frontends/lgs8gxx_priv.h b/linux/drivers/media/dvb/frontends/lgs8gxx_priv.h
new file mode 100644
index 000000000..9776d3068
--- /dev/null
+++ b/linux/drivers/media/dvb/frontends/lgs8gxx_priv.h
@@ -0,0 +1,70 @@
+/*
+ *    Support for Legend Silicon DMB-TH demodulator
+ *    LGS8913, LGS8GL5
+ *    experimental support LGS8G42, LGS8G52
+ *
+ *    Copyright (C) 2007,2008 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)
+ *
+ *    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.
+ *
+ */
+
+#ifndef LGS8913_PRIV_H
+#define LGS8913_PRIV_H
+
+struct lgs8gxx_state {
+	struct i2c_adapter *i2c;
+	/* configuration settings */
+	const struct lgs8gxx_config *config;
+	struct dvb_frontend frontend;
+	u16 curr_gi; /* current guard interval */
+};
+
+#define SC_MASK		0x1C	/* Sub-Carrier Modulation Mask */
+#define SC_QAM64	0x10	/* 64QAM modulation */
+#define SC_QAM32	0x0C	/* 32QAM modulation */
+#define SC_QAM16	0x08	/* 16QAM modulation */
+#define SC_QAM4NR	0x04	/* 4QAM modulation */
+#define SC_QAM4		0x00	/* 4QAM modulation */
+
+#define LGS_FEC_MASK	0x03	/* FEC Rate Mask */
+#define LGS_FEC_0_4	0x00	/* FEC Rate 0.4 */
+#define LGS_FEC_0_6	0x01	/* FEC Rate 0.6 */
+#define LGS_FEC_0_8	0x02	/* FEC Rate 0.8 */
+
+#define TIM_MASK	  0x20	/* Time Interleave Length Mask */
+#define TIM_LONG	  0x00	/* Time Interleave Length = 720 */
+#define TIM_MIDDLE     0x20   /* Time Interleave Length = 240 */
+
+#define CF_MASK	0x80	/* Control Frame Mask */
+#define CF_EN	0x80	/* Control Frame On */
+
+#define GI_MASK	0x03	/* Guard Interval Mask */
+#define GI_420	0x00	/* 1/9 Guard Interval */
+#define GI_595	0x01	/* */
+#define GI_945	0x02	/* 1/4 Guard Interval */
+
+
+#define TS_PARALLEL	0x00	/* Parallel TS Output a.k.a. SPI */
+#define TS_SERIAL	0x01	/* Serial TS Output a.k.a. SSI */
+#define TS_CLK_NORMAL		0x00	/* MPEG Clock Normal */
+#define TS_CLK_INVERTED		0x02	/* MPEG Clock Inverted */
+#define TS_CLK_GATED		0x00	/* MPEG clock gated */
+#define TS_CLK_FREERUN		0x04	/* MPEG clock free running*/
+
+
+#endif
diff --git a/linux/drivers/media/radio/radio-si470x.c b/linux/drivers/media/radio/radio-si470x.c
index 599fc0dcf..b4d6641b4 100644
--- a/linux/drivers/media/radio/radio-si470x.c
+++ b/linux/drivers/media/radio/radio-si470x.c
@@ -1687,7 +1687,7 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 	/* show some infos about the specific si470x device */
 	if (si470x_get_all_registers(radio) < 0) {
 		retval = -EIO;
-		goto err_all;
+		goto err_video;
 	}
 	printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4hx ChipID=0x%4.4hx\n",
 			radio->registers[DEVICEID], radio->registers[CHIPID]);
@@ -1695,7 +1695,7 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 	/* get software and hardware versions */
 	if (si470x_get_scratch_page_versions(radio) < 0) {
 		retval = -EIO;
-		goto err_all;
+		goto err_video;
 	}
 	printk(KERN_INFO DRIVER_NAME
 			": software version %d, hardware version %d\n",
@@ -1728,7 +1728,7 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 	radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
 	if (!radio->buffer) {
 		retval = -EIO;
-		goto err_all;
+		goto err_video;
 	}
 
 	/* rds buffer configuration */
@@ -1750,8 +1750,9 @@ static int si470x_usb_driver_probe(struct usb_interface *intf,
 
 	return 0;
 err_all:
-	video_device_release(radio->videodev);
 	kfree(radio->buffer);
+err_video:
+	video_device_release(radio->videodev);
 err_radio:
 	kfree(radio);
 err_initial:
diff --git a/linux/drivers/media/video/cx88/Makefile b/linux/drivers/media/video/cx88/Makefile
index b06b1275a..5b7e26761 100644
--- a/linux/drivers/media/video/cx88/Makefile
+++ b/linux/drivers/media/video/cx88/Makefile
@@ -1,5 +1,5 @@
 cx88xx-objs	:= cx88-cards.o cx88-core.o cx88-i2c.o cx88-tvaudio.o \
-		   cx88-input.o
+		   cx88-dsp.o cx88-input.o
 cx8800-objs	:= cx88-video.o cx88-vbi.o
 cx8802-objs	:= cx88-mpeg.o
 
diff --git a/linux/drivers/media/video/cx88/cx88-core.c b/linux/drivers/media/video/cx88/cx88-core.c
index 71dccf6af..39cbd152a 100644
--- a/linux/drivers/media/video/cx88/cx88-core.c
+++ b/linux/drivers/media/video/cx88/cx88-core.c
@@ -232,7 +232,7 @@ cx88_free_buffer(struct videobuf_queue *q, struct cx88_buffer *buf)
  * can use the whole SDRAM for the DMA fifos.  To simplify things, we
  * use a static memory layout.  That surely will waste memory in case
  * we don't use all DMA channels at the same time (which will be the
- * case most of the time).  But that still gives us enougth FIFO space
+ * case most of the time).  But that still gives us enough FIFO space
  * to be able to deal with insane long pci latencies ...
  *
  * FIFO space allocations:
@@ -242,6 +242,7 @@ cx88_free_buffer(struct videobuf_queue *q, struct cx88_buffer *buf)
  *    channel  24    (vbi)      -  4.0k
  *    channels 25+26 (audio)    -  4.0k
  *    channel  28    (mpeg)     -  4.0k
+ *    channel  27    (audio rds)-  3.0k
  *    TOTAL                     = 29.0k
  *
  * Every channel has 160 bytes control data (64 bytes instruction
@@ -338,6 +339,18 @@ struct sram_channel cx88_sram_channels[] = {
 		.cnt1_reg   = MO_DMA28_CNT1,
 		.cnt2_reg   = MO_DMA28_CNT2,
 	},
+	[SRAM_CH27] = {
+		.name       = "audio rds",
+		.cmds_start = 0x1801C0,
+		.ctrl_start = 0x180860,
+		.cdt        = 0x180860 + 64,
+		.fifo_start = 0x187400,
+		.fifo_size  = 0x000C00,
+		.ptr1_reg   = MO_DMA27_PTR1,
+		.ptr2_reg   = MO_DMA27_PTR2,
+		.cnt1_reg   = MO_DMA27_CNT1,
+		.cnt2_reg   = MO_DMA27_CNT2,
+	},
 };
 
 int cx88_sram_channel_setup(struct cx88_core *core,
@@ -623,6 +636,7 @@ int cx88_reset(struct cx88_core *core)
 	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], 128, 0);
 	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], 128, 0);
 	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH28], 188*4, 0);
+	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH27], 128, 0);
 
 	/* misc init ... */
 	cx_write(MO_INPUT_FORMAT, ((1 << 13) |   // agc enable
@@ -821,6 +835,8 @@ int cx88_start_audio_dma(struct cx88_core *core)
 	/* constant 128 made buzz in analog Nicam-stereo for bigger fifo_size */
 	int bpl = cx88_sram_channels[SRAM_CH25].fifo_size/4;
 
+	int rds_bpl = cx88_sram_channels[SRAM_CH27].fifo_size/AUD_RDS_LINES;
+
 	/* If downstream RISC is enabled, bail out; ALSA is managing DMA */
 	if (cx_read(MO_AUD_DMACNTRL) & 0x10)
 		return 0;
@@ -828,12 +844,14 @@ int cx88_start_audio_dma(struct cx88_core *core)
 	/* setup fifo + format */
 	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH25], bpl, 0);
 	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH26], bpl, 0);
+	cx88_sram_channel_setup(core, &cx88_sram_channels[SRAM_CH27],
+				rds_bpl, 0);
 
 	cx_write(MO_AUDD_LNGTH, bpl); /* fifo bpl size */
-	cx_write(MO_AUDR_LNGTH, bpl); /* fifo bpl size */
+	cx_write(MO_AUDR_LNGTH, rds_bpl); /* fifo bpl size */
 
-	/* start dma */
-	cx_write(MO_AUD_DMACNTRL, 0x0003); /* Up and Down fifo enable */
+	/* enable Up, Down and Audio RDS fifo */
+	cx_write(MO_AUD_DMACNTRL, 0x0007);
 
 	return 0;
 }
diff --git a/linux/drivers/media/video/cx88/cx88-dsp.c b/linux/drivers/media/video/cx88/cx88-dsp.c
new file mode 100644
index 000000000..da2b306c0
--- /dev/null
+++ b/linux/drivers/media/video/cx88/cx88-dsp.c
@@ -0,0 +1,304 @@
+/*
+ *
+ *  Stereo and SAP detection for cx88
+ *
+ *  Copyright (c) 2009 Marton Balint <cus@fazekas.hu>
+ *
+ *  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/kernel.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+
+#include "cx88.h"
+#include "cx88-reg.h"
+
+#define INT_PI			((s32)(3.141592653589 * 32768.0))
+
+#define compat_remainder(a, b) \
+	 ((float)(((s32)((a)*100))%((s32)((b)*100)))/100.0)
+
+#define baseband_freq(carrier, srate, tone) ((s32)( \
+	 (compat_remainder(carrier + tone, srate)) / srate * 2 * INT_PI))
+
+/* We calculate the baseband frequencies of the carrier and the pilot tones
+ * based on the the sampling rate of the audio rds fifo. */
+
+#define FREQ_A2_CARRIER         baseband_freq(54687.5, 2689.36, 0.0)
+#define FREQ_A2_DUAL            baseband_freq(54687.5, 2689.36, 274.1)
+#define FREQ_A2_STEREO          baseband_freq(54687.5, 2689.36, 117.5)
+
+/* The frequencies below are from the reference driver. They probably need
+ * further adjustments, because they are not tested at all. You may even need
+ * to play a bit with the registers of the chip to select the proper signal
+ * for the input of the audio rds fifo, and measure it's sampling rate to
+ * calculate the proper baseband frequencies... */
+
+#define FREQ_A2M_CARRIER	((s32)(2.114516 * 32768.0))
+#define FREQ_A2M_DUAL		((s32)(2.754916 * 32768.0))
+#define FREQ_A2M_STEREO		((s32)(2.462326 * 32768.0))
+
+#define FREQ_EIAJ_CARRIER	((s32)(1.963495 * 32768.0)) /* 5pi/8  */
+#define FREQ_EIAJ_DUAL		((s32)(2.562118 * 32768.0))
+#define FREQ_EIAJ_STEREO	((s32)(2.601053 * 32768.0))
+
+#define FREQ_BTSC_DUAL		((s32)(1.963495 * 32768.0)) /* 5pi/8  */
+#define FREQ_BTSC_DUAL_REF	((s32)(1.374446 * 32768.0)) /* 7pi/16 */
+
+#define FREQ_BTSC_SAP		((s32)(2.471532 * 32768.0))
+#define FREQ_BTSC_SAP_REF	((s32)(1.730072 * 32768.0))
+
+/* The spectrum of the signal should be empty between these frequencies. */
+#define FREQ_NOISE_START	((s32)(0.100000 * 32768.0))
+#define FREQ_NOISE_END		((s32)(1.200000 * 32768.0))
+
+static unsigned int dsp_debug;
+module_param(dsp_debug, int, 0644);
+MODULE_PARM_DESC(dsp_debug, "enable audio dsp debug messages");
+
+#define dprintk(level, fmt, arg...)	if (dsp_debug >= level) \
+	printk(KERN_DEBUG "%s/0: " fmt, core->name , ## arg)
+
+static s32 int_cos(u32 x)
+{
+	u32 t2, t4, t6, t8;
+	s32 ret;
+	u16 period = x / INT_PI;
+	if (period % 2)
+		return -int_cos(x - INT_PI);
+	x = x % INT_PI;
+	if (x > INT_PI/2)
+		return -int_cos(INT_PI/2 - (x % (INT_PI/2)));
+	/* Now x is between 0 and INT_PI/2.
+	 * To calculate cos(x) we use it's Taylor polinom. */
+	t2 = x*x/32768/2;
+	t4 = t2*x/32768*x/32768/3/4;
+	t6 = t4*x/32768*x/32768/5/6;
+	t8 = t6*x/32768*x/32768/7/8;
+	ret = 32768-t2+t4-t6+t8;
+	return ret;
+}
+
+static u32 int_goertzel(s16 x[], u32 N, u32 freq)
+{
+	/* We use the Goertzel algorithm to determine the power of the
+	 * given frequency in the signal */
+	s32 s_prev = 0;
+	s32 s_prev2 = 0;
+	s32 coeff = 2*int_cos(freq);
+	u32 i;
+	for (i = 0; i < N; i++) {
+		s32 s = x[i] + ((s64)coeff*s_prev/32768) - s_prev2;
+		s_prev2 = s_prev;
+		s_prev = s;
+	}
+	return (u32)(((s64)s_prev2*s_prev2 + (s64)s_prev*s_prev -
+		      (s64)coeff*s_prev2*s_prev/32768)/N/N);
+}
+
+static u32 freq_magnitude(s16 x[], u32 N, u32 freq)
+{
+	u32 sum = int_goertzel(x, N, freq);
+	return (u32)int_sqrt(sum);
+}
+
+static u32 noise_magnitude(s16 x[], u32 N, u32 freq_start, u32 freq_end)
+{
+	int i;
+	u32 sum = 0;
+	u32 freq_step;
+	int samples = 5;
+
+	if (N > 192) {
+		/* The last 192 samples are enough for noise detection */
+		x += (N-192);
+		N = 192;
+	}
+
+	freq_step = (freq_end - freq_start) / (samples - 1);
+
+	for (i = 0; i < samples; i++) {
+		sum += int_goertzel(x, N, freq_start);
+		freq_start += freq_step;
+	}
+
+	return (u32)int_sqrt(sum / samples);
+}
+
+static s32 detect_a2_a2m_eiaj(struct cx88_core *core, s16 x[], u32 N)
+{
+	s32 carrier, stereo, dual, noise;
+	s32 carrier_freq, stereo_freq, dual_freq;
+	s32 ret;
+
+	switch (core->tvaudio) {
+	case WW_BG:
+	case WW_DK:
+		carrier_freq = FREQ_A2_CARRIER;
+		stereo_freq = FREQ_A2_STEREO;
+		dual_freq = FREQ_A2_DUAL;
+		break;
+	case WW_M:
+		carrier_freq = FREQ_A2M_CARRIER;
+		stereo_freq = FREQ_A2M_STEREO;
+		dual_freq = FREQ_A2M_DUAL;
+		break;
+	case WW_EIAJ:
+		carrier_freq = FREQ_EIAJ_CARRIER;
+		stereo_freq = FREQ_EIAJ_STEREO;
+		dual_freq = FREQ_EIAJ_DUAL;
+		break;
+	default:
+		printk(KERN_WARNING "%s/0: unsupported audio mode %d for %s\n",
+		       core->name, core->tvaudio, __func__);
+		return UNSET;
+	}
+
+	carrier = freq_magnitude(x, N, carrier_freq);
+	stereo  = freq_magnitude(x, N, stereo_freq);
+	dual    = freq_magnitude(x, N, dual_freq);
+	noise   = noise_magnitude(x, N, FREQ_NOISE_START, FREQ_NOISE_END);
+
+	dprintk(1, "detect a2/a2m/eiaj: carrier=%d, stereo=%d, dual=%d, "
+		   "noise=%d\n", carrier, stereo, dual, noise);
+
+	if (stereo > dual)
+		ret = V4L2_TUNER_SUB_STEREO;
+	else
+		ret = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+
+	if (core->tvaudio == WW_EIAJ) {
+		/* EIAJ checks may need adjustments */
+		if ((carrier > max(stereo, dual)*2) &&
+		    (carrier < max(stereo, dual)*6) &&
+		    (carrier > 20 && carrier < 200) &&
+		    (max(stereo, dual) > min(stereo, dual))) {
+			/* For EIAJ the carrier is always present,
+			   so we probably don't need noise detection */
+			return ret;
+		}
+	} else {
+		if ((carrier > max(stereo, dual)*2) &&
+		    (carrier < max(stereo, dual)*8) &&
+		    (carrier > 20 && carrier < 200) &&
+		    (noise < 10) &&
+		    (max(stereo, dual) > min(stereo, dual)*2)) {
+			return ret;
+		}
+	}
+	return V4L2_TUNER_SUB_MONO;
+}
+
+static s32 detect_btsc(struct cx88_core *core, s16 x[], u32 N)
+{
+	s32 sap_ref = freq_magnitude(x, N, FREQ_BTSC_SAP_REF);
+	s32 sap = freq_magnitude(x, N, FREQ_BTSC_SAP);
+	s32 dual_ref = freq_magnitude(x, N, FREQ_BTSC_DUAL_REF);
+	s32 dual = freq_magnitude(x, N, FREQ_BTSC_DUAL);
+	dprintk(1, "detect btsc: dual_ref=%d, dual=%d, sap_ref=%d, sap=%d"
+		   "\n", dual_ref, dual, sap_ref, sap);
+	/* FIXME: Currently not supported */
+	return UNSET;
+}
+
+static s16 *read_rds_samples(struct cx88_core *core, u32 *N)
+{
+	struct sram_channel *srch = &cx88_sram_channels[SRAM_CH27];
+	s16 *samples;
+
+	unsigned int i;
+	unsigned int bpl = srch->fifo_size/AUD_RDS_LINES;
+	unsigned int spl = bpl/4;
+	unsigned int sample_count = spl*(AUD_RDS_LINES-1);
+
+	u32 current_address = cx_read(srch->ptr1_reg);
+	u32 offset = (current_address - srch->fifo_start + bpl);
+
+	dprintk(1, "read RDS samples: current_address=%08x (offset=%08x), "
+		"sample_count=%d, aud_intstat=%08x\n", current_address,
+		current_address - srch->fifo_start, sample_count,
+		cx_read(MO_AUD_INTSTAT));
+
+	samples = kmalloc(sizeof(s16)*sample_count, GFP_KERNEL);
+	if (!samples)
+		return NULL;
+
+	*N = sample_count;
+
+	for (i = 0; i < sample_count; i++)  {
+		offset = offset % (AUD_RDS_LINES*bpl);
+		samples[i] = cx_read(srch->fifo_start + offset);
+		offset += 4;
+	}
+
+	if (dsp_debug >= 2) {
+		dprintk(2, "RDS samples dump: ");
+		for (i = 0; i < sample_count; i++)
+			printk("%hd ", samples[i]);
+		printk(".\n");
+	}
+
+	return samples;
+}
+
+s32 cx88_dsp_detect_stereo_sap(struct cx88_core *core)
+{
+	s16 *samples;
+	u32 N = 0;
+	s32 ret = UNSET;
+
+	/* If audio RDS fifo is disabled, we can't read the samples */
+	if (!(cx_read(MO_AUD_DMACNTRL) & 0x04))
+		return ret;
+	if (!(cx_read(AUD_CTL) & EN_FMRADIO_EN_RDS))
+		return ret;
+
+	/* Wait at least 500 ms after an audio standard change */
+	if (time_before(jiffies, core->last_change + msecs_to_jiffies(500)))
+		return ret;
+
+	samples = read_rds_samples(core, &N);
+
+	if (!samples)
+		return ret;
+
+	switch (core->tvaudio) {
+	case WW_BG:
+	case WW_DK:
+#if 0
+	/* We should not detect these, until they are properly tested... */
+	case WW_EIAJ:
+	case WW_M:
+#endif
+		ret = detect_a2_a2m_eiaj(core, samples, N);
+		break;
+	case WW_BTSC:
+		ret = detect_btsc(core, samples, N);
+		break;
+	}
+
+	kfree(samples);
+
+	if (UNSET != ret)
+		dprintk(1, "stereo/sap detection result:%s%s%s\n",
+			   (ret & V4L2_TUNER_SUB_MONO) ? " mono" : "",
+			   (ret & V4L2_TUNER_SUB_STEREO) ? " stereo" : "",
+			   (ret & V4L2_TUNER_SUB_LANG2) ? " dual" : "");
+
+	return ret;
+}
+EXPORT_SYMBOL(cx88_dsp_detect_stereo_sap);
+
diff --git a/linux/drivers/media/video/cx88/cx88-tvaudio.c b/linux/drivers/media/video/cx88/cx88-tvaudio.c
index 0039354cf..76d42b3d8 100644
--- a/linux/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/linux/drivers/media/video/cx88/cx88-tvaudio.c
@@ -167,6 +167,8 @@ static void set_audio_finish(struct cx88_core *core, u32 ctl)
 	/* unmute */
 	volume = cx_sread(SHADOW_AUD_VOL_CTL);
 	cx_swrite(SHADOW_AUD_VOL_CTL, AUD_VOL_CTL, volume);
+
+	core->last_change = jiffies;
 }
 
 /* ----------------------------------------------------------- */
@@ -749,6 +751,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
 		break;
 	case WW_BG:
 	case WW_DK:
+	case WW_M:
 	case WW_I:
 	case WW_L:
 		/* prepare all dsp registers */
@@ -760,6 +763,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
 		if (0 == cx88_detect_nicam(core)) {
 			/* fall back to fm / am mono */
 			set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
+			core->audiomode_current = V4L2_TUNER_MODE_MONO;
 			core->use_nicam = 0;
 		} else {
 			core->use_nicam = 1;
@@ -791,6 +795,7 @@ void cx88_set_tvaudio(struct cx88_core *core)
 void cx88_newstation(struct cx88_core *core)
 {
 	core->audiomode_manual = UNSET;
+	core->last_change = jiffies;
 }
 
 void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
@@ -809,44 +814,42 @@ void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
 			aud_ctl_names[cx_read(AUD_CTL) & 63]);
 	core->astat = reg;
 
-/* TODO
-	Reading from AUD_STATUS is not enough
-	for auto-detecting sap/dual-fm/nicam.
-	Add some code here later.
-*/
-
-# if 0
 	t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP |
 	    V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
-	t->rxsubchans = V4L2_TUNER_SUB_MONO;
+	t->rxsubchans = UNSET;
 	t->audmode = V4L2_TUNER_MODE_MONO;
 
+	switch (mode) {
+	case 0:
+		t->audmode = V4L2_TUNER_MODE_STEREO;
+		break;
+	case 1:
+		t->audmode = V4L2_TUNER_MODE_LANG2;
+		break;
+	case 2:
+		t->audmode = V4L2_TUNER_MODE_MONO;
+		break;
+	case 3:
+		t->audmode = V4L2_TUNER_MODE_SAP;
+		break;
+	}
+
 	switch (core->tvaudio) {
 	case WW_BTSC:
-		t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP;
-		t->rxsubchans = V4L2_TUNER_SUB_STEREO;
-		if (1 == pilot) {
-			/* SAP */
-			t->rxsubchans |= V4L2_TUNER_SUB_SAP;
-		}
-		break;
-	case WW_A2_BG:
-	case WW_A2_DK:
-	case WW_A2_M:
-		if (1 == pilot) {
-			/* stereo */
-			t->rxsubchans =
-			    V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
-			if (0 == mode)
-				t->audmode = V4L2_TUNER_MODE_STEREO;
-		}
-		if (2 == pilot) {
-			/* dual language -- FIXME */
-			t->rxsubchans =
-			    V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
-			t->audmode = V4L2_TUNER_MODE_LANG1;
+	case WW_BG:
+	case WW_DK:
+	case WW_M:
+	case WW_EIAJ:
+		if (!core->use_nicam) {
+			t->rxsubchans = cx88_dsp_detect_stereo_sap(core);
+			break;
 		}
 		break;
+# if 0
+	/* TODO
+		Reading from AUD_STATUS is not enough
+		for auto-detecting sap/dual-fm/nicam.
+	*/
 	case WW_NICAM_BGDKL:
 		if (0 == mode) {
 			t->audmode = V4L2_TUNER_MODE_STEREO;
@@ -859,11 +862,20 @@ void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
 			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
 		}
 		break;
+# endif
 	default:
 		/* nothing */
 		break;
 	}
-# endif
+
+	/* If software stereo detection is not supported... */
+	if (UNSET == t->rxsubchans) {
+		t->rxsubchans = V4L2_TUNER_SUB_MONO;
+		/* If the hardware itself detected stereo, also return
+		   stereo as an available subchannel */
+		if (V4L2_TUNER_MODE_STEREO == t->audmode)
+			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
+	}
 	return;
 }
 
@@ -900,6 +912,7 @@ void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
 		break;
 	case WW_BG:
 	case WW_DK:
+	case WW_M:
 	case WW_I:
 	case WW_L:
 		if (1 == core->use_nicam) {
@@ -925,20 +938,18 @@ void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
 				set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
 			} else {
 				/* TODO: Add A2 autodection */
+				mask = 0x3f;
 				switch (mode) {
 				case V4L2_TUNER_MODE_MONO:
 				case V4L2_TUNER_MODE_LANG1:
-					set_audio_standard_A2(core,
-							      EN_A2_FORCE_MONO1);
+					ctl = EN_A2_FORCE_MONO1;
 					break;
 				case V4L2_TUNER_MODE_LANG2:
-					set_audio_standard_A2(core,
-							      EN_A2_FORCE_MONO2);
+					ctl = EN_A2_FORCE_MONO2;
 					break;
 				case V4L2_TUNER_MODE_STEREO:
 				case V4L2_TUNER_MODE_LANG1_LANG2:
-					set_audio_standard_A2(core,
-							      EN_A2_FORCE_STEREO);
+					ctl = EN_A2_FORCE_STEREO;
 					break;
 				}
 			}
@@ -985,24 +996,39 @@ int cx88_audio_thread(void *data)
 			break;
 		try_to_freeze();
 
-		/* just monitor the audio status for now ... */
-		memset(&t, 0, sizeof(t));
-		cx88_get_stereo(core, &t);
-
-		if (UNSET != core->audiomode_manual)
-			/* manually set, don't do anything. */
-			continue;
-
-		/* monitor signal */
-		if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
-			mode = V4L2_TUNER_MODE_STEREO;
-		else
-			mode = V4L2_TUNER_MODE_MONO;
-		if (mode == core->audiomode_current)
-			continue;
-
-		/* automatically switch to best available mode */
-		cx88_set_stereo(core, mode, 0);
+		switch (core->tvaudio) {
+		case WW_BG:
+		case WW_DK:
+		case WW_M:
+		case WW_I:
+		case WW_L:
+			if (core->use_nicam)
+				goto hw_autodetect;
+
+			/* just monitor the audio status for now ... */
+			memset(&t, 0, sizeof(t));
+			cx88_get_stereo(core, &t);
+
+			if (UNSET != core->audiomode_manual)
+				/* manually set, don't do anything. */
+				continue;
+
+			/* monitor signal and set stereo if available */
+			if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
+				mode = V4L2_TUNER_MODE_STEREO;
+			else
+				mode = V4L2_TUNER_MODE_MONO;
+			if (mode == core->audiomode_current)
+				continue;
+			/* automatically switch to best available mode */
+			cx88_set_stereo(core, mode, 0);
+			break;
+		default:
+hw_autodetect:
+			/* stereo autodetection is supported by hardware so
+			   we don't need to do it manually. Do nothing. */
+			break;
+		}
 	}
 
 	dprintk("cx88: tvaudio thread exiting\n");
diff --git a/linux/drivers/media/video/cx88/cx88.h b/linux/drivers/media/video/cx88/cx88.h
index a34f6ee0c..1cf6900e0 100644
--- a/linux/drivers/media/video/cx88/cx88.h
+++ b/linux/drivers/media/video/cx88/cx88.h
@@ -66,6 +66,8 @@
 #define VBI_LINE_COUNT              17
 #define VBI_LINE_LENGTH           2048
 
+#define AUD_RDS_LINES		     4
+
 /* need "shadow" registers for some write-only ones ... */
 #define SHADOW_AUD_VOL_CTL           1
 #define SHADOW_AUD_BAL_CTL           2
@@ -133,6 +135,7 @@ struct cx88_ctrl {
 #define SRAM_CH25 4   /* audio */
 #define SRAM_CH26 5
 #define SRAM_CH28 6   /* mpeg */
+#define SRAM_CH27 7   /* audio rds */
 /* more */
 
 struct sram_channel {
@@ -354,6 +357,7 @@ struct cx88_core {
 	u32                        input;
 	u32                        astat;
 	u32			   use_nicam;
+	unsigned long		   last_change;
 
 	/* IR remote control state */
 	struct cx88_IR             *ir;
@@ -673,6 +677,7 @@ extern void cx88_setup_xc3028(struct cx88_core *core, struct xc2028_ctrl *ctl);
 #define WW_I2SPT	 8
 #define WW_FM		 9
 #define WW_I2SADC	 10
+#define WW_M		 11
 
 void cx88_set_tvaudio(struct cx88_core *core);
 void cx88_newstation(struct cx88_core *core);
@@ -686,6 +691,11 @@ struct cx8802_dev *cx8802_get_device(int minor);
 struct cx8802_driver * cx8802_get_driver(struct cx8802_dev *dev, enum cx88_board_type btype);
 
 /* ----------------------------------------------------------- */
+/* cx88-dsp.c                                                  */
+
+s32 cx88_dsp_detect_stereo_sap(struct cx88_core *core);
+
+/* ----------------------------------------------------------- */
 /* cx88-input.c                                                */
 
 int cx88_ir_init(struct cx88_core *core, struct pci_dev *pci);
diff --git a/v4l2-apps/util/rewrite_eeprom.pl b/v4l2-apps/util/rewrite_eeprom.pl
new file mode 100644
index 000000000..495c4717c
--- /dev/null
+++ b/v4l2-apps/util/rewrite_eeprom.pl
@@ -0,0 +1,336 @@
+#!/usr/bin/perl -w
+#
+################################################################################
+#  Copyright (C) 2009
+#
+#  Mauro Carvalho Chehab <mchehab@redhat.com>
+#  Douglas Schilling Landgraf <dougsland@redhat.com>
+#
+#  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, version 2 of the License.
+#
+#  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.
+#
+#  Although not very common, on a few devices, the eeprom may be erased, due to a
+#  bug on a *few eeprom* chipsets that sometimes considers i2c messages to other
+#  devices as being for it.
+#
+#  The solution for it is to reprogram the eeprom with their original contents.
+#
+#  Modules this script is known to work with: em28xx and saa7134
+#  * Not tested against newer em28xx chipsets like the em2874 and em2884
+#
+########################################################
+# NOTE                                                 #
+################################################################################
+# Since the script will try to detect the proper i2c bus address, it will only #
+# work well if you have just one V4L device connected.                         #
+################################################################################
+#
+########################################
+# What do you need to run this script? #
+########################################
+#
+# * eeprom - A dump file with the older eeprom.
+#
+# As example this is a dump from EMPIRE TV DUAL (310U):
+#				 ^^^^^^^^^^^^^^
+# shell> dmesg
+#
+# [11196.181543] em28xx #0: i2c eeprom 00: 1a eb 67 95 1a eb 10 e3 d0 12 5c 03 6a 22 00 00
+# [11196.181559] em28xx #0: i2c eeprom 10: 00 00 04 57 4e 07 00 00 00 00 00 00 00 00 00 00
+# [11196.181572] em28xx #0: i2c eeprom 20: 46 00 01 00 f0 10 01 00 00 00 00 00 5b 1e 00 00
+# [11196.181585] em28xx #0: i2c eeprom 30: 00 00 20 40 20 80 02 20 01 01 00 00 00 00 00 00
+# [11196.181598] em28xx #0: i2c eeprom 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181610] em28xx #0: i2c eeprom 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181622] em28xx #0: i2c eeprom 60: 00 00 00 00 00 00 00 00 00 00 22 03 55 00 53 00
+# [11196.181635] em28xx #0: i2c eeprom 70: 42 00 20 00 32 00 38 00 38 00 31 00 20 00 44 00
+# [11196.181648] em28xx #0: i2c eeprom 80: 65 00 76 00 69 00 63 00 65 00 00 00 00 00 00 00
+# [11196.181660] em28xx #0: i2c eeprom 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181673] em28xx #0: i2c eeprom a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181685] em28xx #0: i2c eeprom b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181698] em28xx #0: i2c eeprom c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181710] em28xx #0: i2c eeprom d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181722] em28xx #0: i2c eeprom e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+# [11196.181735] em28xx #0: i2c eeprom f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+#
+#############################################
+# Where can I find my original eeprom?      #
+#############################################
+#
+# e.g: Old dmesg output
+#
+########################################
+# How this script works?	       #
+########################################
+#
+# To use it, you'll need to run the script, passing, as a parameter, the original dmesg with
+# your original eeprom (before the corruption). Something like:
+#
+# shell> perl ./rewrite_eeprom my_old_dmesg_with_right_eeprom.txt > eeprom_script
+#
+# It will generate the eeprom_script file, with a script capable of recovering
+# your eeprom.
+#
+# After having the proper eeprom_script generated, you'll need to run it, as root:
+#
+# shell> sh ./eeprom_script
+#
+#
+# After running the script, your original contents should be restored. Try to
+# remove it and reinsert to see if it will be properly detected again.
+#
+use Switch;
+
+$argv = $ARGV[0];
+
+# Files
+$file_eeprom = "/tmp/eeprom-original.txt";
+$file_bus = "/tmp/i2c-detect-bus.txt";
+$file_addr = "/tmp/i2c-detect-addr.txt";
+$file_i2c_tmp = "/tmp/i2ctmp.txt";
+
+# Bus
+$businfo = "";
+$addrinfo = "";
+
+# Modules
+$modules = "em28xx|saa713";
+$_  = $modules;
+tr/|/ /d;
+s/saa713/saa7134/g;
+$modules_str = $_;
+
+# eeprom stuff
+$eeprom_backup_dir = "~/.eeprom";
+$NR_EEPROM_REGS = 0;
+
+##########################
+# Subroutines            #
+##########################
+
+sub build_script
+{
+	my $script_prevent;
+
+	# Building script
+
+	$script_prevent  = "#!/bin/bash\n";
+	$script_prevent .= "#\n";
+	$script_prevent .= "# Notes:\n";
+	$script_prevent .= "# - i2c_dev module should be loaded\n";
+	$script_prevent .= "# - v4l driver should be loaded\n\n";
+
+
+	$script_prevent .= "if [ ! \"\$UID\" = \"0\" ]; then\n\techo \"You must run this script as root\";\n\texit;\nfi\n\n";
+
+	$script_prevent .= "i2cset &> /dev/null\n";
+	$script_prevent .= "if [ ! \"\$\?\" = \"1\" ]; then\n";
+	$script_prevent .= "\techo \"Please install i2c-tools package before continue.\";\n";
+	$script_prevent .= "\texit;\n";
+	$script_prevent .= "fi\n\n";
+
+	$script_prevent .= "modprobe i2c-dev\n";
+	$script_prevent .= "if [ ! \"\$\?\" = \"0\" ]; then\n";
+	$script_prevent .= "\techo \"Can't load i2c-dev module.\";\n";
+	$script_prevent .= "\texit;\n";
+	$script_prevent .= "fi\n\n";
+
+	$script_prevent .= "clear;\n";
+	$script_prevent .= "echo \"";
+	$script_prevent .=  "\n\033[1;31m#     #     #     ######   #     #  ###  #     #   #####\n";
+	$script_prevent .= "#  #  #    # #    #     #  ##    #   #   ##    #  #     #\n";
+	$script_prevent .= "#  #  #   #   #   #     #  # #   #   #   # #   #  #      \n";
+	$script_prevent .= "#  #  #  #     #  ######   #  #  #   #   #  #  #  #  ####\n";
+	$script_prevent .= "#  #  #  #######  #   #    #   # #   #   #   # #  #     #\n";
+	$script_prevent .= "#  #  #  #     #  #    #   #    ##   #   #    ##  #     #\n";
+	$script_prevent .= " ## ##   #     #  #     #  #     #  ###  #     #   #####\033[0m\n\n";
+
+
+	$script_prevent .= "This tool is *ONLY RECOMMENDED* in cases of: LOST or CORRUPTED EEPROM data.\n";
+	$script_prevent .= "Otherwise:\n\nYOU MAY *LOST* THE CURRENT EEPROM FROM YOUR DEVICE AND IT WILL MAKE YOUR BOARD ";
+	$script_prevent .= "*DO NOT WORK* UNTIL YOU SET THE RIGHT EEPROM AGAIN!\n\n";
+	$script_prevent .= "If you have *any doubt*, BEFORE run it contact people from: linux-media\@vger.kernel.org\n";
+
+	$script_prevent .= "Are you \033[1;31mABSOLUTELY SURE\033[0m to continue? (yes or not)\";\n\n";
+	$script_prevent .= "read confirmation;\n";
+	$script_prevent .= "if \[ ! \"\$confirmation\" = \"yes\" \]; then\n";
+	$script_prevent .= "\techo \"process aborted\";\n";
+	$script_prevent .= "\texit;\n";
+	$script_prevent .= "fi\n\n";
+
+	$script_prevent .= "lsmod | egrep -e \"$modules\" &> /dev/null\n";
+	$script_prevent .= "if [ ! \"\$\?\" = \"0\" ]; then\n";
+	$script_prevent .= "\techo \"Aborting script.. None of the supported driver $modules_str are loaded. Did you forget to connect the device?\";\n";
+	$script_prevent .= "\texit;";
+	$script_prevent .= "\nfi\n\n";
+
+	print $script_prevent;
+}
+
+sub check_user
+{
+	if ($>) {
+		die "You must run this program as root\n";
+	}
+
+}
+
+sub get_bus_and_addr
+{
+
+	my $lines = 0;
+	my $output = "#!/bin/bash\n";
+
+	system("\ni2cdetect -l | egrep -e \"$modules\" 2> /dev/null | cut -b 5 > $file_bus\n");
+
+	# Checking number if lines
+	open(FILE, $file_bus) or die "Can't open `$file_bus': $!";
+	while (sysread FILE, $buffer, 1) {
+		$lines += ($buffer =~ tr/\n//);
+	}
+	close FILE;
+
+	switch ($lines) {
+		case 0 {
+			$output .= "echo \"Could not detect i2c bus from any device, run again $0. Did you forget to connect the device?\";\n";
+			$output .= "echo \"Modules supported: $modules_str\";\n";
+			$output .= "exit;";
+			print $output;
+		}
+		case 1 {
+			# Starting script
+			&build_script;
+		}
+		else {
+			$output .= "humm, I got too many busses, please connect or plug just a hardware peer time!\n";
+			$output .= "Read a note inside the script!\n";
+			$output .= "exit;";
+			print $output;
+		}
+	}
+
+	# Reading BUS from temporary file
+	open (FILE, $file_bus);
+	while (<FILE>) {
+		$businfo = "$_";
+		chomp($businfo);
+	}
+	close FILE;
+
+	system("i2cdetect -y $businfo > $file_i2c_tmp 2> /dev/null");
+	system("awk \'NR==7\' $file_i2c_tmp | cut -d \' \' -f 2 > $file_addr");
+
+	# Reading BUS from temporary file
+	open (FILE, $file_addr);
+	while (<FILE>) {
+		$addrinfo = "$_";
+		chomp($addrinfo);
+	}
+
+	if($addrinfo eq "--") {
+		print "\necho \"**** Failed to recognize bus address!\n**** Please connect your device *with eeprom* and try to run $0 tool again, aborted!\";\n";
+		print "exit;";
+	}
+
+	# Double check
+	$bkp_eeprom  = "\n\ni2cdetect -y $businfo > $file_i2c_tmp 2> /dev/null;\n";
+	$bkp_eeprom .= "BUSCHECK=\`awk \'NR==7\' $file_i2c_tmp | cut -d \' \' -f 2\`;\n";
+	$bkp_eeprom .= "rm -f $file_i2c_tmp;\n";
+	$bkp_eeprom .= "if [ \"\$BUSCHECK\" == \"--\" ]; then\n";
+	$bkp_eeprom .= "\t echo \"Aborting script.. I cannot make backup of your current eeprom.. It's not safe to continue!\";\n";
+	$bkp_eeprom .= "\t exit;\n";
+	$bkp_eeprom .= "fi\n\n";
+
+	# Backup
+	$bkp_eeprom .= "\nDATE=\`/bin/date +%Y%m%d_%I%M%S\`\n";
+	$bkp_eeprom .= "echo \"\nMaking backup of current eeprom - dir [$eeprom_backup_dir/eeprom-\$DATE]\";\n";
+	$bkp_eeprom .= "mkdir -p $eeprom_backup_dir\n";
+	$bkp_eeprom .= "\necho \"\n--EEPROM DUMP START HERE--\n\" > $eeprom_backup_dir/eeprom-\$DATE\n";
+	$bkp_eeprom .= "i2cdump -y $businfo 0x$addrinfo >> $eeprom_backup_dir/eeprom-\$DATE 2> /dev/null\n";
+	$bkp_eeprom .= "if [ ! \"\$\?\" = \"0\" ]; then\n";
+	$bkp_eeprom .= "\t echo \"Aborting script.. I cannot make backup of your current eeprom.. It's not safe to continue!\";\n";
+	$bkp_eeprom .= "\t exit;";
+	$bkp_eeprom .= "\nfi\n";
+	$bkp_eeprom .= "\necho \"\n--DMESG START HERE--\n\" >> $eeprom_backup_dir/eeprom-\$DATE\n";
+	$bkp_eeprom .= "\ndmesg >> $eeprom_backup_dir/eeprom-\$DATE\n";
+
+	print $bkp_eeprom;
+
+	close FILE;
+}
+
+sub print_i2c
+{
+	$cmd = "cat $argv | egrep \"eeprom [0-9a-f]\"| sed -e \"s/.*eeprom/eeprom/\" | cut -d ' ' -f 3-22 > $file_eeprom";
+	system($cmd);
+
+	open (INPUT, "$file_eeprom") or die "Can't open data file: $!";
+
+	# Reading dump
+	@eeprom = "";
+	my $eeprom_pos = 0;
+	while (!eof(INPUT)) {
+		read(INPUT, $fc, 2);
+		$eeprom[$eeprom_pos] = "0x$fc";
+		seek(INPUT, tell(INPUT) + 1, 0);
+		$eeprom_pos++;
+		$NR_EEPROM_REGS++;
+	}
+	close INPUT;
+
+	if ($NR_EEPROM_REGS == 0) {
+		print "\necho \"**** Failed to recognize any dump in: $argv! Make sure that you have the right dump file before run again $0 tool, aborted!\";\n";
+		print "exit;";
+	}
+
+	print "\n\necho \"\033[1;31m\n[DO NOT REMOVE YOUR DEVICE UNTIL THE UPDATE IS FINISHED]\033[0m\";\n";
+	print "echo \"Press ENTER to start\";\n";
+	print "read\n";
+
+	for ($i=0; $i < $NR_EEPROM_REGS; $i++) {
+		printf("i2cset -y $businfo 0x$addrinfo 0x%02x $eeprom[$i] b\n", $i);
+	}
+
+	printf("\necho \"\nDone! Remove and re-insert your device to see if it will be properly detected again. :-)\n\";\n");
+}
+
+################
+# Main         #
+################
+
+&check_user;
+
+if (@ARGV <= 0) {
+
+	my $em28xx_note = "\n\033[1;31m\nNOTES\033[0m:\n\t Not tested against newer em28xx chipsets like the em2874 and em2884\n";
+
+	print "\033[1;31m\nWARNING\033[0m:\n \t This script can *\033[1;31mDAMAGE\033[0m* your board, if you are not sure how to use it, *DO NOT* run it\n";
+	print "\t Current modules supported: $modules_str *\033[1;31mONLY\033[0m*";
+	print $em28xx_note;
+	print "\t If you have *any doubt*, \033[1;31mBEFORE run it\033[0m contact people from: linux-media\@vger.kernel.org\n";
+
+	print "\nUsage:\n";
+	print "\tshell>perl $0 ./dmesg-dump-eeprom > eeprom_script.sh\n";
+	print "\tshell>sh ./eeprom_script.sh\n\n";
+	exit();
+}
+
+if (! -e $argv) {
+	printf("No such file: $argv\n");
+	exit();
+}
+
+# Calling sub routines
+&get_bus_and_addr;
+&print_i2c;
+
+# Removing tmp files
+system("rm -f $file_bus");
+system("rm -f $file_addr");
+system("rm -f $file_i2c_tmp");
+system("rm -f $file_eeprom");