V4L/DVB (7644): Adding support for the NXP TDA10048HN DVB OFDM demodulator

Adding support for the NXP TDA10048HN DVB OFDM demodulator
Signed-off-by: NSteven Toth <stoth@hauppauge.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/Kconfig

@@ -188,6 +188,14 @@ config DVB_DIB7000P
 	  A DVB-T tuner module. Designed for mobile usage. Say Y when you want
 	  to support this frontend.
 
+config DVB_TDA10048
+	tristate "Philips TDA10048HN based"
+	depends on DVB_CORE && I2C
+	default m if DVB_FE_CUSTOMISE
+	select FW_LOADER
+	help
+	  A DVB-T tuner module. Say Y when you want to support this frontend.
+
 comment "DVB-C (cable) frontends"
 	depends on DVB_CORE
 

drivers/media/dvb/frontends/Makefile

@@ -54,3 +54,4 @@ obj-$(CONFIG_DVB_S5H1409) += s5h1409.o
 obj-$(CONFIG_DVB_TUNER_XC5000) += xc5000.o
 obj-$(CONFIG_DVB_TUNER_ITD1000) += itd1000.o
 obj-$(CONFIG_DVB_AU8522) += au8522.o
+obj-$(CONFIG_DVB_TDA10048) += tda10048.o

drivers/media/dvb/frontends/tda10048.c

+/*
+    NXP TDA10048HN DVB OFDM demodulator driver
+
+    Copyright (C) 2008 Steven Toth <stoth@hauppauge.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; 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/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include "dvb_frontend.h"
+#include "tda10048.h"
+
+#define TDA10048_DEFAULT_FIRMWARE "dvb-fe-tda10048-1.0.fw"
+#define TDA10048_DEFAULT_FIRMWARE_SIZE 24878
+
+/* Register name definitions */
+#define TDA10048_IDENTITY          0x00
+#define TDA10048_VERSION           0x01
+#define TDA10048_DSP_CODE_CPT      0x0C
+#define TDA10048_DSP_CODE_IN       0x0E
+#define TDA10048_IN_CONF1          0x10
+#define TDA10048_IN_CONF2          0x11
+#define TDA10048_IN_CONF3          0x12
+#define TDA10048_OUT_CONF1         0x14
+#define TDA10048_OUT_CONF2         0x15
+#define TDA10048_OUT_CONF3         0x16
+#define TDA10048_AUTO              0x18
+#define TDA10048_SYNC_STATUS       0x1A
+#define TDA10048_CONF_C4_1         0x1E
+#define TDA10048_CONF_C4_2         0x1F
+#define TDA10048_CODE_IN_RAM       0x20
+#define TDA10048_CHANNEL_INFO_1_R  0x22
+#define TDA10048_CHANNEL_INFO_2_R  0x23
+#define TDA10048_CHANNEL_INFO1     0x24
+#define TDA10048_CHANNEL_INFO2     0x25
+#define TDA10048_TIME_ERROR_R      0x26
+#define TDA10048_TIME_ERROR        0x27
+#define TDA10048_FREQ_ERROR_LSB_R  0x28
+#define TDA10048_FREQ_ERROR_MSB_R  0x29
+#define TDA10048_FREQ_ERROR_LSB    0x2A
+#define TDA10048_FREQ_ERROR_MSB    0x2B
+#define TDA10048_IT_SEL            0x30
+#define TDA10048_IT_STAT           0x32
+#define TDA10048_DSP_AD_LSB        0x3C
+#define TDA10048_DSP_AD_MSB        0x3D
+#define TDA10048_DSP_REF_LSB       0x3E
+#define TDA10048_DSP_REF_MSB       0x3F
+#define TDA10048_CONF_TRISTATE1    0x44
+#define TDA10048_CONF_TRISTATE2    0x45
+#define TDA10048_CONF_POLARITY     0x46
+#define TDA10048_GPIO_SP_DS0       0x48
+#define TDA10048_GPIO_SP_DS1       0x49
+#define TDA10048_GPIO_SP_DS2       0x4A
+#define TDA10048_GPIO_SP_DS3       0x4B
+#define TDA10048_GPIO_OUT_SEL      0x4C
+#define TDA10048_GPIO_SELECT       0x4D
+#define TDA10048_IC_MODE           0x4E
+#define TDA10048_CONF_XO           0x50
+#define TDA10048_CONF_PLL1         0x51
+#define TDA10048_CONF_PLL2         0x52
+#define TDA10048_CONF_PLL3         0x53
+#define TDA10048_CONF_ADC          0x54
+#define TDA10048_CONF_ADC_2        0x55
+#define TDA10048_CONF_C1_1         0x60
+#define TDA10048_CONF_C1_3         0x62
+#define TDA10048_AGC_CONF          0x70
+#define TDA10048_AGC_THRESHOLD_LSB 0x72
+#define TDA10048_AGC_THRESHOLD_MSB 0x73
+#define TDA10048_AGC_RENORM        0x74
+#define TDA10048_AGC_GAINS         0x76
+#define TDA10048_AGC_TUN_MIN       0x78
+#define TDA10048_AGC_TUN_MAX       0x79
+#define TDA10048_AGC_IF_MIN        0x7A
+#define TDA10048_AGC_IF_MAX        0x7B
+#define TDA10048_AGC_TUN_LEVEL     0x7E
+#define TDA10048_AGC_IF_LEVEL      0x7F
+#define TDA10048_DIG_AGC_LEVEL     0x81
+#define TDA10048_FREQ_PHY2_LSB     0x86
+#define TDA10048_FREQ_PHY2_MSB     0x87
+#define TDA10048_TIME_INVWREF_LSB  0x88
+#define TDA10048_TIME_INVWREF_MSB  0x89
+#define TDA10048_TIME_WREF_LSB     0x8A
+#define TDA10048_TIME_WREF_MID1    0x8B
+#define TDA10048_TIME_WREF_MID2    0x8C
+#define TDA10048_TIME_WREF_MSB     0x8D
+#define TDA10048_NP_OUT            0xA2
+#define TDA10048_CELL_ID_LSB       0xA4
+#define TDA10048_CELL_ID_MSB       0xA5
+#define TDA10048_EXTTPS_ODD        0xAA
+#define TDA10048_EXTTPS_EVEN       0xAB
+#define TDA10048_TPS_LENGTH        0xAC
+#define TDA10048_FREE_REG_1        0xB2
+#define TDA10048_FREE_REG_2        0xB3
+#define TDA10048_CONF_C3_1         0xC0
+#define TDA10048_CYBER_CTRL        0xC2
+#define TDA10048_CBER_NMAX_LSB     0xC4
+#define TDA10048_CBER_NMAX_MSB     0xC5
+#define TDA10048_CBER_LSB          0xC6
+#define TDA10048_CBER_MSB          0xC7
+#define TDA10048_VBER_LSB          0xC8
+#define TDA10048_VBER_MID          0xC9
+#define TDA10048_VBER_MSB          0xCA
+#define TDA10048_CYBER_LUT         0xCC
+#define TDA10048_UNCOR_CTRL        0xCD
+#define TDA10048_UNCOR_CPT_LSB     0xCE
+#define TDA10048_UNCOR_CPT_MSB     0xCF
+#define TDA10048_SOFT_IT_C3        0xD6
+#define TDA10048_CONF_TS2          0xE0
+#define TDA10048_CONF_TS1          0xE1
+
+static unsigned int debug;
+
+#define dprintk(level, fmt, arg...)\
+	do { if (debug >= level)\
+		printk(KERN_DEBUG "tda10048: " fmt, ## arg);\
+	} while (0)
+
+struct tda10048_state {
+
+	struct i2c_adapter *i2c;
+
+	/* configuration settings */
+	const struct tda10048_config *config;
+	struct dvb_frontend frontend;
+
+	int fwloaded;
+};
+
+static struct init_tab {
+	u8	reg;
+	u16	data;
+} init_tab[] = {
+	{ TDA10048_CONF_PLL1, 0x08 },
+	{ TDA10048_CONF_ADC_2, 0x00 },
+	{ TDA10048_CONF_C4_1, 0x00 },
+	{ TDA10048_CONF_PLL1, 0x0f },
+	{ TDA10048_CONF_PLL2, 0x0a },
+	{ TDA10048_CONF_PLL3, 0x43 },
+	{ TDA10048_FREQ_PHY2_LSB, 0x02 },
+	{ TDA10048_FREQ_PHY2_MSB, 0x0a },
+	{ TDA10048_TIME_WREF_LSB, 0xbd },
+	{ TDA10048_TIME_WREF_MID1, 0xe4 },
+	{ TDA10048_TIME_WREF_MID2, 0xa8 },
+	{ TDA10048_TIME_WREF_MSB, 0x02 },
+	{ TDA10048_TIME_INVWREF_LSB, 0x04 },
+	{ TDA10048_TIME_INVWREF_MSB, 0x06 },
+	{ TDA10048_CONF_C4_1, 0x00 },
+	{ TDA10048_CONF_C1_1, 0xa8 },
+	{ TDA10048_AGC_CONF, 0x16 },
+	{ TDA10048_CONF_C1_3, 0x0b },
+	{ TDA10048_AGC_TUN_MIN, 0x00 },
+	{ TDA10048_AGC_TUN_MAX, 0xff },
+	{ TDA10048_AGC_IF_MIN, 0x00 },
+	{ TDA10048_AGC_IF_MAX, 0xff },
+	{ TDA10048_AGC_THRESHOLD_MSB, 0x00 },
+	{ TDA10048_AGC_THRESHOLD_LSB, 0x70 },
+	{ TDA10048_CYBER_CTRL, 0x38 },
+	{ TDA10048_AGC_GAINS, 0x12 },
+	{ TDA10048_CONF_XO, 0x00 },
+	{ TDA10048_CONF_TS1, 0x07 },
+	{ TDA10048_IC_MODE, 0x00 },
+	{ TDA10048_CONF_TS2, 0xc0 },
+	{ TDA10048_CONF_TRISTATE1, 0x21 },
+	{ TDA10048_CONF_TRISTATE2, 0x00 },
+	{ TDA10048_CONF_POLARITY, 0x00 },
+	{ TDA10048_CONF_C4_2, 0x04 },
+	{ TDA10048_CONF_ADC, 0x60 },
+	{ TDA10048_CONF_ADC_2, 0x10 },
+	{ TDA10048_CONF_ADC, 0x60 },
+	{ TDA10048_CONF_ADC_2, 0x00 },
+	{ TDA10048_CONF_C1_1, 0xa8 },
+	{ TDA10048_UNCOR_CTRL, 0x00 },
+	{ TDA10048_CONF_C4_2, 0x04 },
+};
+
+static int tda10048_writereg(struct tda10048_state *state, u8 reg, u8 data)
+{
+	int ret;
+	u8 buf [] = { reg, data };
+	struct i2c_msg msg = {
+		.addr = state->config->demod_address,
+		.flags = 0, .buf = buf, .len = 2 };
+
+	dprintk(2, "%s(reg = 0x%02x, data = 0x%02x)\n", __func__, reg, data);
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+
+	if (ret != 1)
+		printk("%s: writereg error (ret == %i)\n", __func__, ret);
+
+	return (ret != 1) ? -1 : 0;
+}
+
+static u8 tda10048_readreg(struct tda10048_state *state, u8 reg)
+{
+	int ret;
+	u8 b0 [] = { reg };
+	u8 b1 [] = { 0 };
+	struct i2c_msg msg [] = {
+		{ .addr = state->config->demod_address,
+			.flags = 0, .buf = b0, .len = 1 },
+		{ .addr = state->config->demod_address,
+			.flags = I2C_M_RD, .buf = b1, .len = 1 } };
+
+	dprintk(2, "%s(reg = 0x%02x)\n", __func__, reg);
+
+	ret = i2c_transfer(state->i2c, msg, 2);
+
+	if (ret != 2)
+		printk(KERN_ERR "%s: readreg error (ret == %i)\n",
+			__func__, ret);
+
+	return b1[0];
+}
+
+static int tda10048_writeregbulk(struct tda10048_state *state, u8 reg,
+	u8 *data, u16 len)
+{
+	int ret = -EREMOTEIO;
+	struct i2c_msg msg;
+	u8 *buf;
+
+	dprintk(2, "%s(%d, ?, len = %d)\n", __func__, reg, len);
+
+	buf = kmalloc(len + 1, GFP_KERNEL);
+	if (buf == NULL) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	*buf = reg;
+	memcpy(buf + 1, data, len);
+
+	msg.addr = state->config->demod_address;
+	msg.flags = 0;
+	msg.buf = buf;
+	msg.len = len + 1;
+
+	dprintk(2, "%s():  write len = %d\n",
+		__func__, msg.len);
+
+	ret = i2c_transfer(state->i2c, &msg, 1);
+	if (ret != 1) {
+		printk(KERN_ERR "%s(): writereg error err %i\n",
+			 __func__, ret);
+		ret = -EREMOTEIO;
+	}
+
+error:
+	kfree(buf);
+
+	return ret;
+}
+
+static int tda10048_firmware_upload(struct dvb_frontend *fe)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	const struct firmware *fw;
+	int ret;
+	int pos = 0;
+	int cnt;
+	u8 wlen = state->config->fwbulkwritelen;
+
+	if ((wlen != TDA10048_BULKWRITE_200) && (wlen != TDA10048_BULKWRITE_50))
+		wlen = TDA10048_BULKWRITE_200;
+
+	/* request the firmware, this will block and timeout */
+	printk(KERN_INFO "%s: waiting for firmware upload (%s)...\n",
+		__func__,
+		TDA10048_DEFAULT_FIRMWARE);
+
+	ret = request_firmware(&fw, TDA10048_DEFAULT_FIRMWARE,
+		&state->i2c->dev);
+	if (ret) {
+		printk(KERN_ERR "%s: Upload failed. (file not found?)\n",
+			__func__);
+		return -EIO;
+	} else {
+		printk(KERN_INFO "%s: firmware read %Zu bytes.\n",
+			__func__,
+			fw->size);
+		ret = 0;
+	}
+
+	if (fw->size != TDA10048_DEFAULT_FIRMWARE_SIZE) {
+		printk(KERN_ERR "%s: firmware incorrect size\n", __func__);
+		return -EIO;
+	} else {
+		printk(KERN_INFO "%s: firmware uploading\n", __func__);
+
+		/* Soft reset */
+		tda10048_writereg(state, TDA10048_CONF_TRISTATE1,
+			tda10048_readreg(state, TDA10048_CONF_TRISTATE1)
+				& 0xfe);
+		tda10048_writereg(state, TDA10048_CONF_TRISTATE1,
+			tda10048_readreg(state, TDA10048_CONF_TRISTATE1)
+				| 0x01);
+
+		/* Put the demod into host download mode */
+		tda10048_writereg(state, TDA10048_CONF_C4_1,
+			tda10048_readreg(state, TDA10048_CONF_C4_1) & 0xf9);
+
+		/* Boot the DSP */
+		tda10048_writereg(state, TDA10048_CONF_C4_1,
+			tda10048_readreg(state, TDA10048_CONF_C4_1) | 0x08);
+
+		/* Prepare for download */
+		tda10048_writereg(state, TDA10048_DSP_CODE_CPT, 0);
+
+		/* Download the firmware payload */
+		while (pos < fw->size) {
+
+			if ((fw->size - pos) > wlen)
+				cnt = wlen;
+			else
+				cnt = fw->size - pos;
+
+			tda10048_writeregbulk(state, TDA10048_DSP_CODE_IN,
+				&fw->data[pos], cnt);
+
+			pos += cnt;
+		}
+
+		ret = -EIO;
+		/* Wait up to 250ms for the DSP to boot */
+		for (cnt = 0; cnt < 250 ; cnt += 10) {
+
+			msleep(10);
+
+			if (tda10048_readreg(state, TDA10048_SYNC_STATUS)
+				& 0x40) {
+				ret = 0;
+				break;
+			}
+		}
+	}
+
+	release_firmware(fw);
+
+	if (ret == 0) {
+		printk(KERN_INFO "%s: firmware uploaded\n", __func__);
+		state->fwloaded = 1;
+	} else
+		printk(KERN_ERR "%s: firmware upload failed\n", __func__);
+
+	return ret;
+}
+
+static int tda10048_set_inversion(struct dvb_frontend *fe, int inversion)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s(%d)\n", __func__, inversion);
+
+	if (inversion == TDA10048_INVERSION_ON)
+		tda10048_writereg(state, TDA10048_CONF_C1_1,
+			tda10048_readreg(state, TDA10048_CONF_C1_1) | 0x20);
+	else
+		tda10048_writereg(state, TDA10048_CONF_C1_1,
+			tda10048_readreg(state, TDA10048_CONF_C1_1) & 0xdf);
+
+	return 0;
+}
+
+/* Retrieve the demod settings */
+static int tda10048_get_tps(struct tda10048_state *state,
+	struct dvb_ofdm_parameters *p)
+{
+	u8 val;
+
+	/* Make sure the TPS regs are valid */
+	if (!(tda10048_readreg(state, TDA10048_AUTO) & 0x01))
+		return -EAGAIN;
+
+	val = tda10048_readreg(state, TDA10048_OUT_CONF2);
+	switch ((val & 0x60) >> 5) {
+	case 0: p->constellation =   QPSK; break;
+	case 1: p->constellation = QAM_16; break;
+	case 2: p->constellation = QAM_64; break;
+	}
+	switch ((val & 0x18) >> 3) {
+	case 0: p->hierarchy_information = HIERARCHY_NONE; break;
+	case 1: p->hierarchy_information =    HIERARCHY_1; break;
+	case 2: p->hierarchy_information =    HIERARCHY_2; break;
+	case 3: p->hierarchy_information =    HIERARCHY_4; break;
+	}
+	switch (val & 0x07) {
+	case 0: p->code_rate_HP = FEC_1_2; break;
+	case 1: p->code_rate_HP = FEC_2_3; break;
+	case 2: p->code_rate_HP = FEC_3_4; break;
+	case 3: p->code_rate_HP = FEC_5_6; break;
+	case 4: p->code_rate_HP = FEC_7_8; break;
+	}
+
+	val = tda10048_readreg(state, TDA10048_OUT_CONF3);
+	switch (val & 0x07) {
+	case 0: p->code_rate_LP = FEC_1_2; break;
+	case 1: p->code_rate_LP = FEC_2_3; break;
+	case 2: p->code_rate_LP = FEC_3_4; break;
+	case 3: p->code_rate_LP = FEC_5_6; break;
+	case 4: p->code_rate_LP = FEC_7_8; break;
+	}
+
+	val = tda10048_readreg(state, TDA10048_OUT_CONF1);
+	switch ((val & 0x0c) >> 2) {
+	case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
+	case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
+	case 2: p->guard_interval =  GUARD_INTERVAL_1_8; break;
+	case 3: p->guard_interval =  GUARD_INTERVAL_1_4; break;
+	}
+	switch (val & 0x02) {
+	case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
+	case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
+	}
+
+	return 0;
+}
+
+static int tda10048_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	dprintk(1, "%s(%d)\n", __func__, enable);
+
+	if (enable)
+		return tda10048_writereg(state, TDA10048_CONF_C4_1,
+			tda10048_readreg(state, TDA10048_CONF_C4_1) | 0x02);
+	else
+		return tda10048_writereg(state, TDA10048_CONF_C4_1,
+			tda10048_readreg(state, TDA10048_CONF_C4_1) & 0xfd);
+}
+
+static int tda10048_output_mode(struct dvb_frontend *fe, int serial)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	dprintk(1, "%s(%d)\n", __func__, serial);
+
+	/* Ensure pins are out of tri-state */
+	tda10048_writereg(state, TDA10048_CONF_TRISTATE1, 0x21);
+	tda10048_writereg(state, TDA10048_CONF_TRISTATE2, 0x00);
+
+	if (serial) {
+		tda10048_writereg(state, TDA10048_IC_MODE, 0x80 | 0x20);
+		tda10048_writereg(state, TDA10048_CONF_TS2, 0xc0);
+	} else {
+		tda10048_writereg(state, TDA10048_IC_MODE, 0x00);
+		tda10048_writereg(state, TDA10048_CONF_TS2, 0x01);
+	}
+
+	return 0;
+}
+
+/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
+/* TODO: Support manual tuning with specific params */
+static int tda10048_set_frontend(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *p)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s(frequency=%d)\n", __func__, p->frequency);
+
+	if (fe->ops.tuner_ops.set_params) {
+
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 1);
+
+		fe->ops.tuner_ops.set_params(fe, p);
+
+		if (fe->ops.i2c_gate_ctrl)
+			fe->ops.i2c_gate_ctrl(fe, 0);
+	}
+
+	/* Enable demod TPS auto detection and begin acquisition */
+	tda10048_writereg(state, TDA10048_AUTO, 0x57);
+
+	return 0;
+}
+
+/* Establish sane defaults and load firmware. */
+static int tda10048_init(struct dvb_frontend *fe)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	int ret = 0, i;
+
+	dprintk(1, "%s()\n", __func__);
+
+	/* Apply register defaults */
+	for (i = 0; i < ARRAY_SIZE(init_tab); i++)
+		tda10048_writereg(state, init_tab[i].reg, init_tab[i].data);
+
+	if (state->fwloaded == 0)
+		ret = tda10048_firmware_upload(fe);
+
+	/* Set either serial or parallel */
+	tda10048_output_mode(fe, state->config->output_mode);
+
+	/* set inversion */
+	tda10048_set_inversion(fe, state->config->inversion);
+
+	/* Ensure we leave the gate closed */
+	tda10048_i2c_gate_ctrl(fe, 0);
+
+	return ret;
+}
+
+static int tda10048_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	u8 reg;
+
+	*status = 0;
+
+	reg = tda10048_readreg(state, TDA10048_SYNC_STATUS);
+
+	dprintk(1, "%s() status =0x%02x\n", __func__, reg);
+
+	if (reg & 0x02)
+		*status |= FE_HAS_CARRIER;
+
+	if (reg & 0x04)
+		*status |= FE_HAS_SIGNAL;
+
+	if (reg & 0x08) {
+		*status |= FE_HAS_LOCK;
+		*status |= FE_HAS_VITERBI;
+		*status |= FE_HAS_SYNC;
+	}
+
+	return 0;
+}
+
+static int tda10048_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s()\n", __func__);
+
+	/* TODO: A reset may be required here */
+	*ber = tda10048_readreg(state, TDA10048_CBER_MSB) << 8 |
+		tda10048_readreg(state, TDA10048_CBER_LSB);
+
+	return 0;
+}
+
+static int tda10048_read_signal_strength(struct dvb_frontend *fe,
+	u16 *signal_strength)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	u16 v;
+
+	dprintk(1, "%s()\n", __func__);
+
+	v = tda10048_readreg(state, TDA10048_NP_OUT);
+	if (v == 0)
+		*signal_strength = 100;
+	else {
+		/* TODO: Apply .db math for correct values */
+		*signal_strength = v;
+	}
+
+	return 0;
+}
+
+static int tda10048_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s()\n", __func__);
+
+	/* TODO: This result should be the same as signal strength */
+	*snr = tda10048_readreg(state, TDA10048_NP_OUT);
+
+	return 0;
+}
+
+static int tda10048_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s()\n", __func__);
+
+	*ucblocks = tda10048_readreg(state, TDA10048_UNCOR_CPT_MSB) << 8 |
+		tda10048_readreg(state, TDA10048_UNCOR_CPT_LSB);
+
+	return 0;
+}
+
+static int tda10048_get_frontend(struct dvb_frontend *fe,
+	struct dvb_frontend_parameters *p)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+
+	dprintk(1, "%s()\n", __func__);
+
+	p->inversion = tda10048_readreg(state, TDA10048_CONF_C1_1)
+		& 0x20 ? INVERSION_ON : INVERSION_OFF;
+
+	return tda10048_get_tps(state, &p->u.ofdm);
+}
+
+static int tda10048_get_tune_settings(struct dvb_frontend *fe,
+	struct dvb_frontend_tune_settings *tune)
+{
+	tune->min_delay_ms = 1000;
+	return 0;
+}
+
+static void tda10048_release(struct dvb_frontend *fe)
+{
+	struct tda10048_state *state = fe->demodulator_priv;
+	dprintk(1, "%s()\n", __func__);
+	kfree(state);
+}
+
+static struct dvb_frontend_ops tda10048_ops;
+
+struct dvb_frontend *tda10048_attach(const struct tda10048_config *config,
+	struct i2c_adapter *i2c)
+{
+	struct tda10048_state *state = NULL;
+
+	dprintk(1, "%s()\n", __func__);
+
+	/* allocate memory for the internal state */
+	state = kmalloc(sizeof(struct tda10048_state), GFP_KERNEL);
+	if (state == NULL)
+		goto error;
+
+	/* setup the state */
+	state->config = config;
+	state->i2c = i2c;
+	state->fwloaded = 0;
+
+	/* check if the demod is present */
+	if (tda10048_readreg(state, TDA10048_IDENTITY) != 0x048)
+		goto error;
+
+	/* create dvb_frontend */
+	memcpy(&state->frontend.ops, &tda10048_ops,
+		sizeof(struct dvb_frontend_ops));
+	state->frontend.demodulator_priv = state;
+
+	/* Leave the gate closed */
+	tda10048_i2c_gate_ctrl(&state->frontend, 0);
+
+	return &state->frontend;
+
+error:
+	kfree(state);
+	return NULL;
+}
+EXPORT_SYMBOL(tda10048_attach);
+
+static struct dvb_frontend_ops tda10048_ops = {
+
+	.info = {
+		.name			= "NXP TDA10048HN DVB-T",
+		.type			= FE_OFDM,
+		.frequency_min		= 177000000,
+		.frequency_max		= 858000000,
+		.frequency_stepsize	= 166666,
+		.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_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
+		FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
+		FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
+	},
+
+	.release = tda10048_release,
+	.init = tda10048_init,
+	.i2c_gate_ctrl = tda10048_i2c_gate_ctrl,
+	.set_frontend = tda10048_set_frontend,
+	.get_frontend = tda10048_get_frontend,
+	.get_tune_settings = tda10048_get_tune_settings,
+	.read_status = tda10048_read_status,
+	.read_ber = tda10048_read_ber,
+	.read_signal_strength = tda10048_read_signal_strength,
+	.read_snr = tda10048_read_snr,
+	.read_ucblocks = tda10048_read_ucblocks,
+};
+
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug, "Enable verbose debug messages");
+
+MODULE_DESCRIPTION("NXP TDA10048HN DVB-T Demodulator driver");
+MODULE_AUTHOR("Steven Toth");
+MODULE_LICENSE("GPL");

drivers/media/dvb/frontends/tda10048.h

+/*
+    NXP TDA10048HN DVB OFDM demodulator driver
+
+    Copyright (C) 2008 Steven Toth <stoth@hauppauge.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; 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 TDA10048_H
+#define TDA10048_H
+
+#include <linux/dvb/frontend.h>
+#include <linux/firmware.h>
+
+struct tda10048_config {
+
+	/* the demodulator's i2c address */
+	u8 demod_address;
+
+	/* serial/parallel output */
+#define TDA10048_PARALLEL_OUTPUT 0
+#define TDA10048_SERIAL_OUTPUT   1
+	u8 output_mode;
+
+#define TDA10048_BULKWRITE_200	200
+#define TDA10048_BULKWRITE_50	50
+	u8 fwbulkwritelen;
+
+	/* Spectral Inversion */
+#define TDA10048_INVERSION_OFF 0
+#define TDA10048_INVERSION_ON  1
+	u8 inversion;
+};
+
+#if defined(CONFIG_DVB_TDA10048) || \
+	(defined(CONFIG_DVB_TDA10048_MODULE) && defined(MODULE))
+extern struct dvb_frontend *tda10048_attach(
+	const struct tda10048_config *config,
+	struct i2c_adapter *i2c);
+#else
+static inline struct dvb_frontend *tda10048_attach(
+	const struct tda10048_config *config,
+	struct i2c_adapter *i2c)
+{
+	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+	return NULL;
+}
+#endif /* CONFIG_DVB_TDA10048 */
+
+#endif /* TDA10048_H */