Release 4.7 drivers/media/dvb-frontends/atbm8830.c

Directory: drivers/media/dvb-frontends
/*
 *    Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
 *    ATBM8830, ATBM8831
 *
 *    Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.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 <asm/div64.h>
#include "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;
}

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david wong david wong 175 99.43% 1 50.00%
joe perches joe perches 1 0.57% 1 50.00%
Total 176 100.00% 2 100.00%



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;
}

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david wong david wong 199 99.50% 1 50.00%
joe perches joe perches 1 0.50% 1 50.00%
Total 200 100.00% 2 100.00%

/* 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);
}

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david wong david wong 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%



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;
}

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david wong david wong 80 100.00% 2 100.00%
Total 80 100.00% 2 100.00%



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;
}

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david wong david wong 216 100.00% 2 100.00%
Total 216 100.00% 2 100.00%



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;
}

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david wong david wong 46 100.00% 1 100.00%
Total 46 100.00% 1 100.00%



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;
}

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david wong david wong 62 100.00% 1 100.00%
Total 62 100.00% 1 100.00%



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;
}

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david wong david wong 152 100.00% 1 100.00%
Total 152 100.00% 1 100.00%



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;
}

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david wong david wong 87 100.00% 1 100.00%
Total 87 100.00% 1 100.00%



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;
}


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david wong david wong 112 100.00% 2 100.00%
Total 112 100.00% 2 100.00%



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

	kfree(state);
}

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david wong david wong 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%



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;
}

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david wong david wong 150 100.00% 1 100.00%
Total 150 100.00% 1 100.00%



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;
}

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david wong david wong 63 78.75% 1 33.33%
mauro carvalho chehab mauro carvalho chehab 17 21.25% 2 66.67%
Total 80 100.00% 3 100.00%



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;
}

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david wong david wong 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%



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;
}

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david wong david wong 102 98.08% 1 50.00%
mauro carvalho chehab mauro carvalho chehab 2 1.92% 1 50.00%
Total 104 100.00% 2 100.00%



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;
}

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david wong david wong 109 100.00% 1 100.00%
Total 109 100.00% 1 100.00%



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;
}

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david wong david wong 112 100.00% 1 100.00%
Total 112 100.00% 1 100.00%



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

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david wong david wong 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%



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

Contributors
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david wong david wong 30 100.00% 1 100.00%
Total 30 100.00% 1 100.00%



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);
}

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david wong david wong 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%


static struct dvb_frontend_ops atbm8830_ops = {
	.delsys = { SYS_DTMB },
	.info = {
		.name = "AltoBeam ATBM8830/8831 DMB-TH",
		.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 = 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;

}
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david wong david wong 192 100.00% 1 100.00%
Total 192 100.00% 1 100.00%


EXPORT_SYMBOL(atbm8830_attach);

MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
MODULE_LICENSE("GPL");
Overall Contributors
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david wong david wong 2221 98.67% 3 37.50%
mauro carvalho chehab mauro carvalho chehab 27 1.20% 3 37.50%
joe perches joe perches 2 0.09% 1 12.50%
antti palosaari antti palosaari 1 0.04% 1 12.50%
Total 2251 100.00% 8 100.00%
  Directory: drivers/media/dvb-frontends

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
david wong	david wong	175	99.43%	1	50.00%
joe perches	joe perches	1	0.57%	1	50.00%
	Total	176	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/media/dvb-frontends/atbm8830.c

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