drivers/media/dvb-frontends/atbm8830.c - linux/kernel/git/viro/vfs - Git at Google


            
            // SPDX-License-Identifier: GPL-2.0-or-later

            
            /*

            
             *    Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator

            
             *    ATBM8830, ATBM8831

            
             *

            
             *    Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com>

            
             */


            #include <asm/div64.h>

            
            #include <media/dvb_frontend.h>


            #include "atbm8830.h"

            
            #include "atbm8830_priv.h"


            #define dprintk(args...) \

            
            	do { \

            
            		if (debug) \

            
            			printk(KERN_DEBUG "atbm8830: " args); \

            
            	} while (0)


            static int debug;


            module_param(debug, int, 0644);

            
            MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");


            static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)

            
            {

            
            	int ret = 0;

            
            	u8 dev_addr;

            
            	u8 buf1[] = { reg >> 8, reg & 0xFF };

            
            	u8 buf2[] = { data };

            
            	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };

            
            	struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };


            	dev_addr = priv->config->demod_address;

            
            	msg1.addr = dev_addr;

            
            	msg2.addr = dev_addr;


            	if (debug >= 2)

            
            		dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);


            	ret = i2c_transfer(priv->i2c, &msg1, 1);

            
            	if (ret != 1)

            
            		return -EIO;


            	ret = i2c_transfer(priv->i2c, &msg2, 1);

            
            	return (ret != 1) ? -EIO : 0;

            
            }


            static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)

            
            {

            
            	int ret;

            
            	u8 dev_addr;


            	u8 buf1[] = { reg >> 8, reg & 0xFF };

            
            	u8 buf2[] = { 0 };

            
            	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };

            
            	struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };


            	dev_addr = priv->config->demod_address;

            
            	msg1.addr = dev_addr;

            
            	msg2.addr = dev_addr;


            	ret = i2c_transfer(priv->i2c, &msg1, 1);

            
            	if (ret != 1) {

            
            		dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);

            
            		return -EIO;

            
            	}


            	ret = i2c_transfer(priv->i2c, &msg2, 1);

            
            	if (ret != 1)

            
            		return -EIO;


            	*p_data = buf2[0];

            
            	if (debug >= 2)

            
            		dprintk("%s: reg=0x%04X, data=0x%02X\n",

            
            			__func__, reg, buf2[0]);


            	return 0;

            
            }


            /* Lock register latch so that multi-register read is atomic */

            
            static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)

            
            {

            
            	return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);

            
            }


            static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)

            
            {

            
            	u32 val;

            
            	u64 t;


            	/* 0x100000 * freq / 30.4MHz */

            
            	t = (u64)0x100000 * freq;

            
            	do_div(t, 30400);

            
            	val = t;


            	atbm8830_write_reg(priv, REG_OSC_CLK, val);

            
            	atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);

            
            	atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);


            	return 0;

            
            }


            static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)

            
            {


            	u32 fs = priv->config->osc_clk_freq;

            
            	u64 t;

            
            	u32 val;

            
            	u8 dat;


            	if (freq != 0) {

            
            		/* 2 * PI * (freq - fs) / fs * (2 ^ 22) */

            
            		t = (u64) 2 * 31416 * (freq - fs);

            
            		t <<= 22;

            
            		do_div(t, fs);

            
            		do_div(t, 1000);

            
            		val = t;


            		atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);

            
            		atbm8830_write_reg(priv, REG_IF_FREQ, val);

            
            		atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);

            
            		atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);


            		atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);

            
            		dat &= 0xFC;

            
            		atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);

            
            	} else {

            
            		/* Zero IF */

            
            		atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);


            		atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);

            
            		dat &= 0xFC;

            
            		dat |= 0x02;

            
            		atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);


            		if (priv->config->zif_swap_iq)

            
            			atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);

            
            		else

            
            			atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);

            
            	}


            	return 0;

            
            }


            static int is_locked(struct atbm_state *priv, u8 *locked)

            
            {

            
            	u8 status;


            	atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);


            	if (locked != NULL)

            
            		*locked = (status == 1);

            
            	return 0;

            
            }


            static int set_agc_config(struct atbm_state *priv,

            
            	u8 min, u8 max, u8 hold_loop)

            
            {

            
            	/* no effect if both min and max are zero */

            
            	if (!min && !max)

            
            	    return 0;


            	atbm8830_write_reg(priv, REG_AGC_MIN, min);

            
            	atbm8830_write_reg(priv, REG_AGC_MAX, max);

            
            	atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);


            	return 0;

            
            }


            static int set_static_channel_mode(struct atbm_state *priv)

            
            {

            
            	int i;


            	for (i = 0; i < 5; i++)

            
            		atbm8830_write_reg(priv, 0x099B + i, 0x08);


            	atbm8830_write_reg(priv, 0x095B, 0x7F);

            
            	atbm8830_write_reg(priv, 0x09CB, 0x01);

            
            	atbm8830_write_reg(priv, 0x09CC, 0x7F);

            
            	atbm8830_write_reg(priv, 0x09CD, 0x7F);

            
            	atbm8830_write_reg(priv, 0x0E01, 0x20);


            	/* For single carrier */

            
            	atbm8830_write_reg(priv, 0x0B03, 0x0A);

            
            	atbm8830_write_reg(priv, 0x0935, 0x10);

            
            	atbm8830_write_reg(priv, 0x0936, 0x08);

            
            	atbm8830_write_reg(priv, 0x093E, 0x08);

            
            	atbm8830_write_reg(priv, 0x096E, 0x06);


            	/* frame_count_max0 */

            
            	atbm8830_write_reg(priv, 0x0B09, 0x00);

            
            	/* frame_count_max1 */

            
            	atbm8830_write_reg(priv, 0x0B0A, 0x08);


            	return 0;

            
            }


            static int set_ts_config(struct atbm_state *priv)

            
            {

            
            	const struct atbm8830_config *cfg = priv->config;


            	/*Set parallel/serial ts mode*/

            
            	atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);

            
            	atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);

            
            	/*Set ts sampling edge*/

            
            	atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,

            
            		cfg->ts_sampling_edge ? 1 : 0);

            
            	/*Set ts clock freerun*/

            
            	atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,

            
            		cfg->ts_clk_gated ? 0 : 1);


            	return 0;

            
            }


            static int atbm8830_init(struct dvb_frontend *fe)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;

            
            	const struct atbm8830_config *cfg = priv->config;


            	/*Set oscillator frequency*/

            
            	set_osc_freq(priv, cfg->osc_clk_freq);


            	/*Set IF frequency*/

            
            	set_if_freq(priv, cfg->if_freq);


            	/*Set AGC Config*/

            
            	set_agc_config(priv, cfg->agc_min, cfg->agc_max,

            
            		cfg->agc_hold_loop);


            	/*Set static channel mode*/

            
            	set_static_channel_mode(priv);


            	set_ts_config(priv);

            
            	/*Turn off DSP reset*/

            
            	atbm8830_write_reg(priv, 0x000A, 0);


            	/*SW version test*/

            
            	atbm8830_write_reg(priv, 0x020C, 11);


            	/* Run */

            
            	atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);


            	return 0;

            
            }


            static void atbm8830_release(struct dvb_frontend *fe)

            
            {

            
            	struct atbm_state *state = fe->demodulator_priv;

            
            	dprintk("%s\n", __func__);


            	kfree(state);

            
            }


            static int atbm8830_set_fe(struct dvb_frontend *fe)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;

            
            	int i;

            
            	u8 locked = 0;

            
            	dprintk("%s\n", __func__);


            	/* set 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);

            
            		if (fe->ops.i2c_gate_ctrl)

            
            			fe->ops.i2c_gate_ctrl(fe, 0);

            
            	}


            	/* start auto lock */

            
            	for (i = 0; i < 10; i++) {

            
            		mdelay(100);

            
            		dprintk("Try %d\n", i);

            
            		is_locked(priv, &locked);

            
            		if (locked != 0) {

            
            			dprintk("ATBM8830 locked!\n");

            
            			break;

            
            		}

            
            	}


            	return 0;

            
            }


            static int atbm8830_get_fe(struct dvb_frontend *fe,

            
            			   struct dtv_frontend_properties *c)

            
            {

            
            	dprintk("%s\n", __func__);


            	/* TODO: get real readings from device */

            
            	/* inversion status */

            
            	c->inversion = INVERSION_OFF;


            	/* bandwidth */

            
            	c->bandwidth_hz = 8000000;


            	c->code_rate_HP = FEC_AUTO;

            
            	c->code_rate_LP = FEC_AUTO;


            	c->modulation = QAM_AUTO;


            	/* transmission mode */

            
            	c->transmission_mode = TRANSMISSION_MODE_AUTO;


            	/* guard interval */

            
            	c->guard_interval = GUARD_INTERVAL_AUTO;


            	/* hierarchy */

            
            	c->hierarchy = HIERARCHY_NONE;


            	return 0;

            
            }


            static int atbm8830_get_tune_settings(struct dvb_frontend *fe,

            
            	struct dvb_frontend_tune_settings *fesettings)

            
            {

            
            	fesettings->min_delay_ms = 0;

            
            	fesettings->step_size = 0;

            
            	fesettings->max_drift = 0;

            
            	return 0;

            
            }


            static int atbm8830_read_status(struct dvb_frontend *fe,

            
            				enum fe_status *fe_status)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;

            
            	u8 locked = 0;

            
            	u8 agc_locked = 0;


            	dprintk("%s\n", __func__);

            
            	*fe_status = 0;


            	is_locked(priv, &locked);

            
            	if (locked) {

            
            		*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |

            
            			FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;

            
            	}

            
            	dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);


            	atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);

            
            	dprintk("AGC Lock: %d\n", agc_locked);


            	return 0;

            
            }


            static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;

            
            	u32 frame_err;

            
            	u8 t;


            	dprintk("%s\n", __func__);


            	atbm8830_reglatch_lock(priv, 1);


            	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);

            
            	frame_err = t & 0x7F;

            
            	frame_err <<= 8;

            
            	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);

            
            	frame_err |= t;


            	atbm8830_reglatch_lock(priv, 0);


            	*ber = frame_err * 100 / 32767;


            	dprintk("%s: ber=0x%x\n", __func__, *ber);

            
            	return 0;

            
            }


            static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;

            
            	u32 pwm;

            
            	u8 t;


            	dprintk("%s\n", __func__);

            
            	atbm8830_reglatch_lock(priv, 1);


            	atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);

            
            	pwm = t & 0x03;

            
            	pwm <<= 8;

            
            	atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);

            
            	pwm |= t;


            	atbm8830_reglatch_lock(priv, 0);


            	dprintk("AGC PWM = 0x%02X\n", pwm);

            
            	pwm = 0x400 - pwm;


            	*signal = pwm * 0x10000 / 0x400;


            	return 0;

            
            }


            static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)

            
            {

            
            	dprintk("%s\n", __func__);

            
            	*snr = 0;

            
            	return 0;

            
            }


            static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)

            
            {

            
            	dprintk("%s\n", __func__);

            
            	*ucblocks = 0;

            
            	return 0;

            
            }


            static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)

            
            {

            
            	struct atbm_state *priv = fe->demodulator_priv;


            	return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);

            
            }


            static const struct dvb_frontend_ops atbm8830_ops = {

            
            	.delsys = { SYS_DTMB },

            
            	.info = {

            
            		.name = "AltoBeam ATBM8830/8831 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 = atbm8830_release,


            	.init = atbm8830_init,

            
            	.sleep = NULL,

            
            	.write = NULL,

            
            	.i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,


            	.set_frontend = atbm8830_set_fe,

            
            	.get_frontend = atbm8830_get_fe,

            
            	.get_tune_settings = atbm8830_get_tune_settings,


            	.read_status = atbm8830_read_status,

            
            	.read_ber = atbm8830_read_ber,

            
            	.read_signal_strength = atbm8830_read_signal_strength,

            
            	.read_snr = atbm8830_read_snr,

            
            	.read_ucblocks = atbm8830_read_ucblocks,

            
            };


            struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,

            
            	struct i2c_adapter *i2c)

            
            {

            
            	struct atbm_state *priv = NULL;

            
            	u8 data = 0;


            	dprintk("%s()\n", __func__);


            	if (config == NULL || i2c == NULL)

            
            		return NULL;


            	priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);

            
            	if (priv == NULL)

            
            		goto error_out;


            	priv->config = config;

            
            	priv->i2c = i2c;


            	/* check if the demod is there */

            
            	if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {

            
            		dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",

            
            			__func__, priv->config->demod_address);

            
            		goto error_out;

            
            	}

            
            	dprintk("atbm8830 chip id: 0x%02X\n", data);


            	memcpy(&priv->frontend.ops, &atbm8830_ops,

            
            	       sizeof(struct dvb_frontend_ops));

            
            	priv->frontend.demodulator_priv = priv;


            	atbm8830_init(&priv->frontend);


            	atbm8830_i2c_gate_ctrl(&priv->frontend, 1);


            	return &priv->frontend;


            error_out:

            
            	dprintk("%s() error_out\n", __func__);

            
            	kfree(priv);

            
            	return NULL;


            }

            
            EXPORT_SYMBOL_GPL(atbm8830_attach);


            MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");

            
            MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");

            
            MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
	* ATBM8830, ATBM8831
	*
	* Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.com>
	*/

	#include <asm/div64.h>
	#include <media/dvb_frontend.h>

	#include "atbm8830.h"
	#include "atbm8830_priv.h"

	#define dprintk(args...) \
	do { \
	if (debug) \
	printk(KERN_DEBUG "atbm8830: " args); \
	} while (0)

	static int debug;

	module_param(debug, int, 0644);
	MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

	static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
	{
	int ret = 0;
	u8 dev_addr;
	u8 buf1[] = { reg >> 8, reg & 0xFF };
	u8 buf2[] = { data };
	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
	struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };

	dev_addr = priv->config->demod_address;
	msg1.addr = dev_addr;
	msg2.addr = dev_addr;

	if (debug >= 2)
	dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);

	ret = i2c_transfer(priv->i2c, &msg1, 1);
	if (ret != 1)
	return -EIO;

	ret = i2c_transfer(priv->i2c, &msg2, 1);
	return (ret != 1) ? -EIO : 0;
	}

	static int atbm8830_read_reg(struct atbm_state priv, u16 reg, u8 p_data)
	{
	int ret;
	u8 dev_addr;

	u8 buf1[] = { reg >> 8, reg & 0xFF };
	u8 buf2[] = { 0 };
	struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
	struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };

	dev_addr = priv->config->demod_address;
	msg1.addr = dev_addr;
	msg2.addr = dev_addr;

	ret = i2c_transfer(priv->i2c, &msg1, 1);
	if (ret != 1) {
	dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
	return -EIO;
	}

	ret = i2c_transfer(priv->i2c, &msg2, 1);
	if (ret != 1)
	return -EIO;

	*p_data = buf2[0];
	if (debug >= 2)
	dprintk("%s: reg=0x%04X, data=0x%02X\n",
	__func__, reg, buf2[0]);

	return 0;
	}

	/* Lock register latch so that multi-register read is atomic */
	static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
	{
	return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
	}

	static int set_osc_freq(struct atbm_state priv, u32 freq /in kHz*/)
	{
	u32 val;
	u64 t;

	/* 0x100000 * freq / 30.4MHz */
	t = (u64)0x100000 * freq;
	do_div(t, 30400);
	val = t;

	atbm8830_write_reg(priv, REG_OSC_CLK, val);
	atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
	atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);

	return 0;
	}

	static int set_if_freq(struct atbm_state priv, u32 freq /in kHz*/)
	{

	u32 fs = priv->config->osc_clk_freq;
	u64 t;
	u32 val;
	u8 dat;

	if (freq != 0) {
	/* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
	t = (u64) 2 * 31416 * (freq - fs);
	t <<= 22;
	do_div(t, fs);
	do_div(t, 1000);
	val = t;

	atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
	atbm8830_write_reg(priv, REG_IF_FREQ, val);
	atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
	atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);

	atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
	dat &= 0xFC;
	atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
	} else {
	/* Zero IF */
	atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);

	atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
	dat &= 0xFC;
	dat \|= 0x02;
	atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);

	if (priv->config->zif_swap_iq)
	atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
	else
	atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
	}

	return 0;
	}

	static int is_locked(struct atbm_state priv, u8 locked)
	{
	u8 status;

	atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);

	if (locked != NULL)
	*locked = (status == 1);
	return 0;
	}

	static int set_agc_config(struct atbm_state *priv,
	u8 min, u8 max, u8 hold_loop)
	{
	/* no effect if both min and max are zero */
	if (!min && !max)
	return 0;

	atbm8830_write_reg(priv, REG_AGC_MIN, min);
	atbm8830_write_reg(priv, REG_AGC_MAX, max);
	atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);

	return 0;
	}

	static int set_static_channel_mode(struct atbm_state *priv)
	{
	int i;

	for (i = 0; i < 5; i++)
	atbm8830_write_reg(priv, 0x099B + i, 0x08);

	atbm8830_write_reg(priv, 0x095B, 0x7F);
	atbm8830_write_reg(priv, 0x09CB, 0x01);
	atbm8830_write_reg(priv, 0x09CC, 0x7F);
	atbm8830_write_reg(priv, 0x09CD, 0x7F);
	atbm8830_write_reg(priv, 0x0E01, 0x20);

	/* For single carrier */
	atbm8830_write_reg(priv, 0x0B03, 0x0A);
	atbm8830_write_reg(priv, 0x0935, 0x10);
	atbm8830_write_reg(priv, 0x0936, 0x08);
	atbm8830_write_reg(priv, 0x093E, 0x08);
	atbm8830_write_reg(priv, 0x096E, 0x06);

	/* frame_count_max0 */
	atbm8830_write_reg(priv, 0x0B09, 0x00);
	/* frame_count_max1 */
	atbm8830_write_reg(priv, 0x0B0A, 0x08);

	return 0;
	}

	static int set_ts_config(struct atbm_state *priv)
	{
	const struct atbm8830_config *cfg = priv->config;

	/Set parallel/serial ts mode/
	atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
	atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
	/Set ts sampling edge/
	atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
	cfg->ts_sampling_edge ? 1 : 0);
	/Set ts clock freerun/
	atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
	cfg->ts_clk_gated ? 0 : 1);

	return 0;
	}

	static int atbm8830_init(struct dvb_frontend *fe)
	{
	struct atbm_state *priv = fe->demodulator_priv;
	const struct atbm8830_config *cfg = priv->config;

	/Set oscillator frequency/
	set_osc_freq(priv, cfg->osc_clk_freq);

	/Set IF frequency/
	set_if_freq(priv, cfg->if_freq);

	/Set AGC Config/
	set_agc_config(priv, cfg->agc_min, cfg->agc_max,
	cfg->agc_hold_loop);

	/Set static channel mode/
	set_static_channel_mode(priv);

	set_ts_config(priv);
	/Turn off DSP reset/
	atbm8830_write_reg(priv, 0x000A, 0);

	/SW version test/
	atbm8830_write_reg(priv, 0x020C, 11);

	/* Run */
	atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);

	return 0;
	}


	static void atbm8830_release(struct dvb_frontend *fe)
	{
	struct atbm_state *state = fe->demodulator_priv;
	dprintk("%s\n", __func__);

	kfree(state);
	}

	static int atbm8830_set_fe(struct dvb_frontend *fe)
	{
	struct atbm_state *priv = fe->demodulator_priv;
	int i;
	u8 locked = 0;
	dprintk("%s\n", __func__);

	/* set 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);
	if (fe->ops.i2c_gate_ctrl)
	fe->ops.i2c_gate_ctrl(fe, 0);
	}

	/* start auto lock */
	for (i = 0; i < 10; i++) {
	mdelay(100);
	dprintk("Try %d\n", i);
	is_locked(priv, &locked);
	if (locked != 0) {
	dprintk("ATBM8830 locked!\n");
	break;
	}
	}

	return 0;
	}

	static int atbm8830_get_fe(struct dvb_frontend *fe,
	struct dtv_frontend_properties *c)
	{
	dprintk("%s\n", __func__);

	/* TODO: get real readings from device */
	/* inversion status */
	c->inversion = INVERSION_OFF;

	/* bandwidth */
	c->bandwidth_hz = 8000000;

	c->code_rate_HP = FEC_AUTO;
	c->code_rate_LP = FEC_AUTO;

	c->modulation = QAM_AUTO;

	/* transmission mode */
	c->transmission_mode = TRANSMISSION_MODE_AUTO;

	/* guard interval */
	c->guard_interval = GUARD_INTERVAL_AUTO;

	/* hierarchy */
	c->hierarchy = HIERARCHY_NONE;

	return 0;
	}

	static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
	struct dvb_frontend_tune_settings *fesettings)
	{
	fesettings->min_delay_ms = 0;
	fesettings->step_size = 0;
	fesettings->max_drift = 0;
	return 0;
	}

	static int atbm8830_read_status(struct dvb_frontend *fe,
	enum fe_status *fe_status)
	{
	struct atbm_state *priv = fe->demodulator_priv;
	u8 locked = 0;
	u8 agc_locked = 0;

	dprintk("%s\n", __func__);
	*fe_status = 0;

	is_locked(priv, &locked);
	if (locked) {
	*fe_status \|= FE_HAS_SIGNAL \| FE_HAS_CARRIER \|
	FE_HAS_VITERBI \| FE_HAS_SYNC \| FE_HAS_LOCK;
	}
	dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);

	atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
	dprintk("AGC Lock: %d\n", agc_locked);

	return 0;
	}

	static int atbm8830_read_ber(struct dvb_frontend fe, u32 ber)
	{
	struct atbm_state *priv = fe->demodulator_priv;
	u32 frame_err;
	u8 t;

	dprintk("%s\n", __func__);

	atbm8830_reglatch_lock(priv, 1);

	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
	frame_err = t & 0x7F;
	frame_err <<= 8;
	atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
	frame_err \|= t;

	atbm8830_reglatch_lock(priv, 0);

	ber = frame_err 100 / 32767;

	dprintk("%s: ber=0x%x\n", __func__, *ber);
	return 0;
	}

	static int atbm8830_read_signal_strength(struct dvb_frontend fe, u16 signal)
	{
	struct atbm_state *priv = fe->demodulator_priv;
	u32 pwm;
	u8 t;

	dprintk("%s\n", __func__);
	atbm8830_reglatch_lock(priv, 1);

	atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
	pwm = t & 0x03;
	pwm <<= 8;
	atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
	pwm \|= t;

	atbm8830_reglatch_lock(priv, 0);

	dprintk("AGC PWM = 0x%02X\n", pwm);
	pwm = 0x400 - pwm;

	signal = pwm 0x10000 / 0x400;

	return 0;
	}

	static int atbm8830_read_snr(struct dvb_frontend fe, u16 snr)
	{
	dprintk("%s\n", __func__);
	*snr = 0;
	return 0;
	}

	static int atbm8830_read_ucblocks(struct dvb_frontend fe, u32 ucblocks)
	{
	dprintk("%s\n", __func__);
	*ucblocks = 0;
	return 0;
	}

	static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
	{
	struct atbm_state *priv = fe->demodulator_priv;

	return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
	}

	static const struct dvb_frontend_ops atbm8830_ops = {
	.delsys = { SYS_DTMB },
	.info = {
	.name = "AltoBeam ATBM8830/8831 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 = atbm8830_release,

	.init = atbm8830_init,
	.sleep = NULL,
	.write = NULL,
	.i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,

	.set_frontend = atbm8830_set_fe,
	.get_frontend = atbm8830_get_fe,
	.get_tune_settings = atbm8830_get_tune_settings,

	.read_status = atbm8830_read_status,
	.read_ber = atbm8830_read_ber,
	.read_signal_strength = atbm8830_read_signal_strength,
	.read_snr = atbm8830_read_snr,
	.read_ucblocks = atbm8830_read_ucblocks,
	};

	struct dvb_frontend atbm8830_attach(const struct atbm8830_config config,
	struct i2c_adapter *i2c)
	{
	struct atbm_state *priv = NULL;
	u8 data = 0;

	dprintk("%s()\n", __func__);

	if (config == NULL \|\| i2c == NULL)
	return NULL;

	priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
	if (priv == NULL)
	goto error_out;

	priv->config = config;
	priv->i2c = i2c;

	/* check if the demod is there */
	if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
	dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
	__func__, priv->config->demod_address);
	goto error_out;
	}
	dprintk("atbm8830 chip id: 0x%02X\n", data);

	memcpy(&priv->frontend.ops, &atbm8830_ops,
	sizeof(struct dvb_frontend_ops));
	priv->frontend.demodulator_priv = priv;

	atbm8830_init(&priv->frontend);

	atbm8830_i2c_gate_ctrl(&priv->frontend, 1);

	return &priv->frontend;

	error_out:
	dprintk("%s() error_out\n", __func__);
	kfree(priv);
	return NULL;

	}
	EXPORT_SYMBOL_GPL(atbm8830_attach);

	MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
	MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
	MODULE_LICENSE("GPL");