au8522.c

trident tm5600的linux驱动

	{ 0x8260, 0xf5 },
	{ 0x8261, 0x06 },
	{ 0x821a, 0x00 },
	{ 0x8546, 0x40 },
	{ 0x8210, 0x26 },
	{ 0x8211, 0xf6 },
	{ 0x8212, 0x84 },
	{ 0x8213, 0x02 },
	{ 0x8502, 0x01 },
	{ 0x8121, 0x04 },
	{ 0x8122, 0x04 },
	{ 0x852e, 0x10 },
	{ 0x80a4, 0xca },
	{ 0x80a7, 0x40 },
	{ 0x8526, 0x01 },
};

static int au8522_enable_modulation(struct dvb_frontend *fe,
				    fe_modulation_t m)
{
	struct au8522_state *state = fe->demodulator_priv;
	int i;

	dprintk("%s(0x%08x)\n", __func__, m);

	switch (m) {
	case VSB_8:
		dprintk("%s() VSB_8\n", __func__);
		for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
			au8522_writereg(state,
				VSB_mod_tab[i].reg,
				VSB_mod_tab[i].data);
		au8522_set_if(fe, state->config->vsb_if);
		break;
	case QAM_64:
	case QAM_256:
		dprintk("%s() QAM 64/256\n", __func__);
		for (i = 0; i < ARRAY_SIZE(QAM_mod_tab); i++)
			au8522_writereg(state,
				QAM_mod_tab[i].reg,
				QAM_mod_tab[i].data);
		au8522_set_if(fe, state->config->qam_if);
		break;
	default:
		dprintk("%s() Invalid modulation\n", __func__);
		return -EINVAL;
	}

	state->current_modulation = m;

	return 0;
}

/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int au8522_set_frontend(struct dvb_frontend *fe,
			       struct dvb_frontend_parameters *p)
{
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

	dprintk("%s(frequency=%d)\n", __func__, p->frequency);

	if ((state->current_frequency == p->frequency) &&
	    (state->current_modulation == p->u.vsb.modulation))
		return 0;

	au8522_enable_modulation(fe, p->u.vsb.modulation);

	/* Allow the demod to settle */
	msleep(100);

	if (fe->ops.tuner_ops.set_params) {
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 1);
		ret = fe->ops.tuner_ops.set_params(fe, p);
		if (fe->ops.i2c_gate_ctrl)
			fe->ops.i2c_gate_ctrl(fe, 0);
	}

	if (ret < 0)
		return ret;

	state->current_frequency = p->frequency;

	return 0;
}

/* Reset the demod hardware and reset all of the configuration registers
   to a default state. */
static int au8522_init(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	dprintk("%s()\n", __func__);

	au8522_writereg(state, 0xa4, 1 << 5);

	au8522_i2c_gate_ctrl(fe, 1);

	return 0;
}

static int au8522_led_gpio_enable(struct au8522_state *state, int onoff)
{
	struct au8522_led_config *led_config = state->config->led_cfg;
	u8 val;

	/* bail out if we cant control an LED */
	if (!led_config || !led_config->gpio_output ||
	    !led_config->gpio_output_enable || !led_config->gpio_output_disable)
		return 0;

	val = au8522_readreg(state, 0x4000 |
			     (led_config->gpio_output & ~0xc000));
	if (onoff) {
		/* enable GPIO output */
		val &= ~((led_config->gpio_output_enable >> 8) & 0xff);
		val |=  (led_config->gpio_output_enable & 0xff);
	} else {
		/* disable GPIO output */
		val &= ~((led_config->gpio_output_disable >> 8) & 0xff);
		val |=  (led_config->gpio_output_disable & 0xff);
	}
	return au8522_writereg(state, 0x8000 |
			       (led_config->gpio_output & ~0xc000), val);
}

/* led = 0 | off
 * led = 1 | signal ok
 * led = 2 | signal strong
 * led < 0 | only light led if leds are currently off
 */
static int au8522_led_ctrl(struct au8522_state *state, int led)
{
	struct au8522_led_config *led_config = state->config->led_cfg;
	int i, ret = 0;

	/* bail out if we cant control an LED */
	if (!led_config || !led_config->gpio_leds ||
	    !led_config->num_led_states || !led_config->led_states)
		return 0;

	if (led < 0) {
		/* if LED is already lit, then leave it as-is */
		if (state->led_state)
			return 0;
		else
			led *= -1;
	}

	/* toggle LED if changing state */
	if (state->led_state != led) {
		u8 val;

		dprintk("%s: %d\n", __func__, led);

		au8522_led_gpio_enable(state, 1);

		val = au8522_readreg(state, 0x4000 |
				     (led_config->gpio_leds & ~0xc000));

		/* start with all leds off */
		for (i = 0; i < led_config->num_led_states; i++)
			val &= ~led_config->led_states[i];

		/* set selected LED state */
		if (led < led_config->num_led_states)
			val |= led_config->led_states[led];
		else if (led_config->num_led_states)
			val |=
			led_config->led_states[led_config->num_led_states - 1];

		ret = au8522_writereg(state, 0x8000 |
				      (led_config->gpio_leds & ~0xc000), val);
		if (ret < 0)
			return ret;

		state->led_state = led;

		if (led == 0)
			au8522_led_gpio_enable(state, 0);
	}

	return 0;
}

static int au8522_sleep(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	dprintk("%s()\n", __func__);

	/* turn off led */
	au8522_led_ctrl(state, 0);

	state->current_frequency = 0;

	return 0;
}

static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
	struct au8522_state *state = fe->demodulator_priv;
	u8 reg;
	u32 tuner_status = 0;

	*status = 0;

	if (state->current_modulation == VSB_8) {
		dprintk("%s() Checking VSB_8\n", __func__);
		reg = au8522_readreg(state, 0x4088);
		if ((reg & 0x03) == 0x03)
			*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
	} else {
		dprintk("%s() Checking QAM\n", __func__);
		reg = au8522_readreg(state, 0x4541);
		if (reg & 0x80)
			*status |= FE_HAS_VITERBI;
		if (reg & 0x20)
			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
	}

	switch (state->config->status_mode) {
	case AU8522_DEMODLOCKING:
		dprintk("%s() DEMODLOCKING\n", __func__);
		if (*status & FE_HAS_VITERBI)
			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
		break;
	case AU8522_TUNERLOCKING:
		/* Get the tuner status */
		dprintk("%s() TUNERLOCKING\n", __func__);
		if (fe->ops.tuner_ops.get_status) {
			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 1);

			fe->ops.tuner_ops.get_status(fe, &tuner_status);

			if (fe->ops.i2c_gate_ctrl)
				fe->ops.i2c_gate_ctrl(fe, 0);
		}
		if (tuner_status)
			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
		break;
	}
	state->fe_status = *status;

	if (*status & FE_HAS_LOCK)
		/* turn on LED, if it isn't on already */
		au8522_led_ctrl(state, -1);
	else
		/* turn off LED */
		au8522_led_ctrl(state, 0);

	dprintk("%s() status 0x%08x\n", __func__, *status);

	return 0;
}

static int au8522_led_status(struct au8522_state *state, const u16 *snr)
{
	struct au8522_led_config *led_config = state->config->led_cfg;
	int led;
	u16 strong;

	/* bail out if we cant control an LED */
	if (!led_config)
		return 0;

	if (0 == (state->fe_status & FE_HAS_LOCK))
		return au8522_led_ctrl(state, 0);
	else if (state->current_modulation == QAM_256)
		strong = led_config->qam256_strong;
	else if (state->current_modulation == QAM_64)
		strong = led_config->qam64_strong;
	else /* (state->current_modulation == VSB_8) */
		strong = led_config->vsb8_strong;

	if (*snr >= strong)
		led = 2;
	else
		led = 1;

	if ((state->led_state) &&
	    (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
		/* snr didn't change enough to bother
		 * changing the color of the led */
		return 0;

	return au8522_led_ctrl(state, led);
}

static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct au8522_state *state = fe->demodulator_priv;
	int ret = -EINVAL;

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

	if (state->current_modulation == QAM_256)
		ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
					    ARRAY_SIZE(qam256_mse2snr_tab),
					    au8522_readreg(state, 0x4522),
					    snr);
	else if (state->current_modulation == QAM_64)
		ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
					    ARRAY_SIZE(qam64_mse2snr_tab),
					    au8522_readreg(state, 0x4522),
					    snr);
	else /* VSB_8 */
		ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
					    ARRAY_SIZE(vsb_mse2snr_tab),
					    au8522_readreg(state, 0x4311),
					    snr);

	if (state->config->led_cfg)
		au8522_led_status(state, snr);

	return ret;
}

static int au8522_read_signal_strength(struct dvb_frontend *fe,
				       u16 *signal_strength)
{
	return au8522_read_snr(fe, signal_strength);
}

static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct au8522_state *state = fe->demodulator_priv;

	if (state->current_modulation == VSB_8)
		*ucblocks = au8522_readreg(state, 0x4087);
	else
		*ucblocks = au8522_readreg(state, 0x4543);

	return 0;
}

static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	return au8522_read_ucblocks(fe, ber);
}

static int au8522_get_frontend(struct dvb_frontend *fe,
				struct dvb_frontend_parameters *p)
{
	struct au8522_state *state = fe->demodulator_priv;

	p->frequency = state->current_frequency;
	p->u.vsb.modulation = state->current_modulation;

	return 0;
}

static int au8522_get_tune_settings(struct dvb_frontend *fe,
				    struct dvb_frontend_tune_settings *tune)
{
	tune->min_delay_ms = 1000;
	return 0;
}

static void au8522_release(struct dvb_frontend *fe)
{
	struct au8522_state *state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops au8522_ops;

struct dvb_frontend *au8522_attach(const struct au8522_config *config,
				   struct i2c_adapter *i2c)
{
	struct au8522_state *state = NULL;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
#if 0
	/* check if the demod exists */
	reg = au8522_readreg(state, 0x04);
	if ((reg != 0x0066) && (reg != 0x007f))
		goto error;
#endif
	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &au8522_ops,
	       sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;

	if (au8522_init(&state->frontend) != 0) {
		printk(KERN_ERR "%s: Failed to initialize correctly\n",
			__func__);
		goto error;
	}

	/* Note: Leaving the I2C gate open here. */
	au8522_i2c_gate_ctrl(&state->frontend, 1);

	return &state->frontend;

error:
	kfree(state);
	return NULL;
}
EXPORT_SYMBOL(au8522_attach);

static struct dvb_frontend_ops au8522_ops = {

	.info = {
		.name			= "Auvitek AU8522 QAM/8VSB Frontend",
		.type			= FE_ATSC,
		.frequency_min		= 54000000,
		.frequency_max		= 858000000,
		.frequency_stepsize	= 62500,
		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
	},

	.init                 = au8522_init,
	.sleep                = au8522_sleep,
	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
	.set_frontend         = au8522_set_frontend,
	.get_frontend         = au8522_get_frontend,
	.get_tune_settings    = au8522_get_tune_settings,
	.read_status          = au8522_read_status,
	.read_ber             = au8522_read_ber,
	.read_signal_strength = au8522_read_signal_strength,
	.read_snr             = au8522_read_snr,
	.read_ucblocks        = au8522_read_ucblocks,
	.release              = au8522_release,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable verbose debug messages");

MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");