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linux/drivers/media/tuners/fc0012.c
Antti Palosaari c5dc3b98ff [media] fc0012: remove unused callback and correct one comment 
There is no need to keep dummy sleep() callback implementation as
DVB-core checks existence of it before calls callback. Due to that
we can remove it.
FC0012 is based of direct-conversion receiver architecture
(aka Zero-IF) where is no IF used. Due to that IF is always 0 Hz.
Fix comment to point that.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans-Frieder Vogt <hfvogt@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2013-01-06 09:09:06 -02:00

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/*
* Fitipower FC0012 tuner driver
*
* Copyright (C) 2012 Hans-Frieder Vogt <hfvogt@gmx.net>
*
* 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 "fc0012.h"
#include "fc0012-priv.h"
static int fc0012_writereg(struct fc0012_priv *priv, u8 reg, u8 val)
{
u8 buf[2] = {reg, val};
struct i2c_msg msg = {
.addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
};
if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
dev_err(&priv->i2c->dev,
"%s: I2C write reg failed, reg: %02x, val: %02x\n",
KBUILD_MODNAME, reg, val);
return -EREMOTEIO;
}
return 0;
}
static int fc0012_readreg(struct fc0012_priv *priv, u8 reg, u8 *val)
{
struct i2c_msg msg[2] = {
{ .addr = priv->cfg->i2c_address, .flags = 0,
.buf = &reg, .len = 1 },
{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
.buf = val, .len = 1 },
};
if (i2c_transfer(priv->i2c, msg, 2) != 2) {
dev_err(&priv->i2c->dev,
"%s: I2C read reg failed, reg: %02x\n",
KBUILD_MODNAME, reg);
return -EREMOTEIO;
}
return 0;
}
static int fc0012_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static int fc0012_init(struct dvb_frontend *fe)
{
struct fc0012_priv *priv = fe->tuner_priv;
int i, ret = 0;
unsigned char reg[] = {
0x00, /* dummy reg. 0 */
0x05, /* reg. 0x01 */
0x10, /* reg. 0x02 */
0x00, /* reg. 0x03 */
0x00, /* reg. 0x04 */
0x0f, /* reg. 0x05: may also be 0x0a */
0x00, /* reg. 0x06: divider 2, VCO slow */
0x00, /* reg. 0x07: may also be 0x0f */
0xff, /* reg. 0x08: AGC Clock divide by 256, AGC gain 1/256,
Loop Bw 1/8 */
0x6e, /* reg. 0x09: Disable LoopThrough, Enable LoopThrough: 0x6f */
0xb8, /* reg. 0x0a: Disable LO Test Buffer */
0x82, /* reg. 0x0b: Output Clock is same as clock frequency,
may also be 0x83 */
0xfc, /* reg. 0x0c: depending on AGC Up-Down mode, may need 0xf8 */
0x02, /* reg. 0x0d: AGC Not Forcing & LNA Forcing, 0x02 for DVB-T */
0x00, /* reg. 0x0e */
0x00, /* reg. 0x0f */
0x00, /* reg. 0x10: may also be 0x0d */
0x00, /* reg. 0x11 */
0x1f, /* reg. 0x12: Set to maximum gain */
0x08, /* reg. 0x13: Set to Middle Gain: 0x08,
Low Gain: 0x00, High Gain: 0x10, enable IX2: 0x80 */
0x00, /* reg. 0x14 */
0x04, /* reg. 0x15: Enable LNA COMPS */
};
switch (priv->cfg->xtal_freq) {
case FC_XTAL_27_MHZ:
case FC_XTAL_28_8_MHZ:
reg[0x07] |= 0x20;
break;
case FC_XTAL_36_MHZ:
default:
break;
}
if (priv->cfg->dual_master)
reg[0x0c] |= 0x02;
if (priv->cfg->loop_through)
reg[0x09] |= 0x01;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
for (i = 1; i < sizeof(reg); i++) {
ret = fc0012_writereg(priv, i, reg[i]);
if (ret)
break;
}
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (ret)
dev_err(&priv->i2c->dev, "%s: fc0012_writereg failed: %d\n",
KBUILD_MODNAME, ret);
return ret;
}
static int fc0012_set_params(struct dvb_frontend *fe)
{
struct fc0012_priv *priv = fe->tuner_priv;
int i, ret = 0;
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
u32 freq = p->frequency / 1000;
u32 delsys = p->delivery_system;
unsigned char reg[7], am, pm, multi, tmp;
unsigned long f_vco;
unsigned short xtal_freq_khz_2, xin, xdiv;
int vco_select = false;
if (fe->callback) {
ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
FC_FE_CALLBACK_VHF_ENABLE, (freq > 300000 ? 0 : 1));
if (ret)
goto exit;
}
switch (priv->cfg->xtal_freq) {
case FC_XTAL_27_MHZ:
xtal_freq_khz_2 = 27000 / 2;
break;
case FC_XTAL_36_MHZ:
xtal_freq_khz_2 = 36000 / 2;
break;
case FC_XTAL_28_8_MHZ:
default:
xtal_freq_khz_2 = 28800 / 2;
break;
}
/* select frequency divider and the frequency of VCO */
if (freq < 37084) { /* freq * 96 < 3560000 */
multi = 96;
reg[5] = 0x82;
reg[6] = 0x00;
} else if (freq < 55625) { /* freq * 64 < 3560000 */
multi = 64;
reg[5] = 0x82;
reg[6] = 0x02;
} else if (freq < 74167) { /* freq * 48 < 3560000 */
multi = 48;
reg[5] = 0x42;
reg[6] = 0x00;
} else if (freq < 111250) { /* freq * 32 < 3560000 */
multi = 32;
reg[5] = 0x42;
reg[6] = 0x02;
} else if (freq < 148334) { /* freq * 24 < 3560000 */
multi = 24;
reg[5] = 0x22;
reg[6] = 0x00;
} else if (freq < 222500) { /* freq * 16 < 3560000 */
multi = 16;
reg[5] = 0x22;
reg[6] = 0x02;
} else if (freq < 296667) { /* freq * 12 < 3560000 */
multi = 12;
reg[5] = 0x12;
reg[6] = 0x00;
} else if (freq < 445000) { /* freq * 8 < 3560000 */
multi = 8;
reg[5] = 0x12;
reg[6] = 0x02;
} else if (freq < 593334) { /* freq * 6 < 3560000 */
multi = 6;
reg[5] = 0x0a;
reg[6] = 0x00;
} else {
multi = 4;
reg[5] = 0x0a;
reg[6] = 0x02;
}
f_vco = freq * multi;
if (f_vco >= 3060000) {
reg[6] |= 0x08;
vco_select = true;
}
if (freq >= 45000) {
/* From divided value (XDIV) determined the FA and FP value */
xdiv = (unsigned short)(f_vco / xtal_freq_khz_2);
if ((f_vco - xdiv * xtal_freq_khz_2) >= (xtal_freq_khz_2 / 2))
xdiv++;
pm = (unsigned char)(xdiv / 8);
am = (unsigned char)(xdiv - (8 * pm));
if (am < 2) {
reg[1] = am + 8;
reg[2] = pm - 1;
} else {
reg[1] = am;
reg[2] = pm;
}
} else {
/* fix for frequency less than 45 MHz */
reg[1] = 0x06;
reg[2] = 0x11;
}
/* fix clock out */
reg[6] |= 0x20;
/* From VCO frequency determines the XIN ( fractional part of Delta
Sigma PLL) and divided value (XDIV) */
xin = (unsigned short)(f_vco - (f_vco / xtal_freq_khz_2) * xtal_freq_khz_2);
xin = (xin << 15) / xtal_freq_khz_2;
if (xin >= 16384)
xin += 32768;
reg[3] = xin >> 8; /* xin with 9 bit resolution */
reg[4] = xin & 0xff;
if (delsys == SYS_DVBT) {
reg[6] &= 0x3f; /* bits 6 and 7 describe the bandwidth */
switch (p->bandwidth_hz) {
case 6000000:
reg[6] |= 0x80;
break;
case 7000000:
reg[6] |= 0x40;
break;
case 8000000:
default:
break;
}
} else {
dev_err(&priv->i2c->dev, "%s: modulation type not supported!\n",
KBUILD_MODNAME);
return -EINVAL;
}
/* modified for Realtek demod */
reg[5] |= 0x07;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
for (i = 1; i <= 6; i++) {
ret = fc0012_writereg(priv, i, reg[i]);
if (ret)
goto exit;
}
/* VCO Calibration */
ret = fc0012_writereg(priv, 0x0e, 0x80);
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x00);
/* VCO Re-Calibration if needed */
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x00);
if (!ret) {
msleep(10);
ret = fc0012_readreg(priv, 0x0e, &tmp);
}
if (ret)
goto exit;
/* vco selection */
tmp &= 0x3f;
if (vco_select) {
if (tmp > 0x3c) {
reg[6] &= ~0x08;
ret = fc0012_writereg(priv, 0x06, reg[6]);
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x80);
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x00);
}
} else {
if (tmp < 0x02) {
reg[6] |= 0x08;
ret = fc0012_writereg(priv, 0x06, reg[6]);
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x80);
if (!ret)
ret = fc0012_writereg(priv, 0x0e, 0x00);
}
}
priv->frequency = p->frequency;
priv->bandwidth = p->bandwidth_hz;
exit:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (ret)
dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
KBUILD_MODNAME, __func__, ret);
return ret;
}
static int fc0012_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct fc0012_priv *priv = fe->tuner_priv;
*frequency = priv->frequency;
return 0;
}
static int fc0012_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
*frequency = 0; /* Zero-IF */
return 0;
}
static int fc0012_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
{
struct fc0012_priv *priv = fe->tuner_priv;
*bandwidth = priv->bandwidth;
return 0;
}
#define INPUT_ADC_LEVEL -8
static int fc0012_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
{
struct fc0012_priv *priv = fe->tuner_priv;
int ret;
unsigned char tmp;
int int_temp, lna_gain, int_lna, tot_agc_gain, power;
const int fc0012_lna_gain_table[] = {
/* low gain */
-63, -58, -99, -73,
-63, -65, -54, -60,
/* middle gain */
71, 70, 68, 67,
65, 63, 61, 58,
/* high gain */
197, 191, 188, 186,
184, 182, 181, 179,
};
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
ret = fc0012_writereg(priv, 0x12, 0x00);
if (ret)
goto err;
ret = fc0012_readreg(priv, 0x12, &tmp);
if (ret)
goto err;
int_temp = tmp;
ret = fc0012_readreg(priv, 0x13, &tmp);
if (ret)
goto err;
lna_gain = tmp & 0x1f;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (lna_gain < ARRAY_SIZE(fc0012_lna_gain_table)) {
int_lna = fc0012_lna_gain_table[lna_gain];
tot_agc_gain = (abs((int_temp >> 5) - 7) - 2 +
(int_temp & 0x1f)) * 2;
power = INPUT_ADC_LEVEL - tot_agc_gain - int_lna / 10;
if (power >= 45)
*strength = 255; /* 100% */
else if (power < -95)
*strength = 0;
else
*strength = (power + 95) * 255 / 140;
*strength |= *strength << 8;
} else {
ret = -1;
}
goto exit;
err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
exit:
if (ret)
dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
KBUILD_MODNAME, __func__, ret);
return ret;
}
static const struct dvb_tuner_ops fc0012_tuner_ops = {
.info = {
.name = "Fitipower FC0012",
.frequency_min = 37000000, /* estimate */
.frequency_max = 862000000, /* estimate */
.frequency_step = 0,
},
.release = fc0012_release,
.init = fc0012_init,
.set_params = fc0012_set_params,
.get_frequency = fc0012_get_frequency,
.get_if_frequency = fc0012_get_if_frequency,
.get_bandwidth = fc0012_get_bandwidth,
.get_rf_strength = fc0012_get_rf_strength,
};
struct dvb_frontend *fc0012_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, const struct fc0012_config *cfg)
{
struct fc0012_priv *priv;
int ret;
u8 chip_id;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
priv = kzalloc(sizeof(struct fc0012_priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
goto err;
}
priv->cfg = cfg;
priv->i2c = i2c;
/* check if the tuner is there */
ret = fc0012_readreg(priv, 0x00, &chip_id);
if (ret < 0)
goto err;
dev_dbg(&i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
switch (chip_id) {
case 0xa1:
break;
default:
ret = -ENODEV;
goto err;
}
dev_info(&i2c->dev, "%s: Fitipower FC0012 successfully identified\n",
KBUILD_MODNAME);
if (priv->cfg->loop_through) {
ret = fc0012_writereg(priv, 0x09, 0x6f);
if (ret < 0)
goto err;
}
/*
* TODO: Clock out en or div?
* For dual tuner configuration clearing bit [0] is required.
*/
if (priv->cfg->clock_out) {
ret = fc0012_writereg(priv, 0x0b, 0x82);
if (ret < 0)
goto err;
}
fe->tuner_priv = priv;
memcpy(&fe->ops.tuner_ops, &fc0012_tuner_ops,
sizeof(struct dvb_tuner_ops));
err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
if (ret) {
dev_dbg(&i2c->dev, "%s: failed: %d\n", __func__, ret);
kfree(priv);
return NULL;
}
return fe;
}
EXPORT_SYMBOL(fc0012_attach);
MODULE_DESCRIPTION("Fitipower FC0012 silicon tuner driver");
MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.6");
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