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378 lines
8.5 KiB
378 lines
8.5 KiB
/* |
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Montage Technology TS2020 - Silicon Tuner driver |
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Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com> |
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Copyright (C) 2009-2012 TurboSight.com |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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#include "dvb_frontend.h" |
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#include "ts2020.h" |
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#define TS2020_XTAL_FREQ 27000 /* in kHz */ |
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#define FREQ_OFFSET_LOW_SYM_RATE 3000 |
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struct ts2020_priv { |
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/* i2c details */ |
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int i2c_address; |
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struct i2c_adapter *i2c; |
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u8 clk_out_div; |
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u32 frequency; |
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u32 frequency_div; |
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}; |
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static int ts2020_release(struct dvb_frontend *fe) |
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{ |
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kfree(fe->tuner_priv); |
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fe->tuner_priv = NULL; |
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return 0; |
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} |
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static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data) |
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{ |
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struct ts2020_priv *priv = fe->tuner_priv; |
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u8 buf[] = { reg, data }; |
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struct i2c_msg msg[] = { |
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{ |
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.addr = priv->i2c_address, |
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.flags = 0, |
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.buf = buf, |
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.len = 2 |
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} |
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}; |
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int err; |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 1); |
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err = i2c_transfer(priv->i2c, msg, 1); |
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if (err != 1) { |
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printk(KERN_ERR |
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"%s: writereg error(err == %i, reg == 0x%02x, value == 0x%02x)\n", |
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__func__, err, reg, data); |
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return -EREMOTEIO; |
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} |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 0); |
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return 0; |
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} |
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static int ts2020_readreg(struct dvb_frontend *fe, u8 reg) |
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{ |
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struct ts2020_priv *priv = fe->tuner_priv; |
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int ret; |
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u8 b0[] = { reg }; |
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u8 b1[] = { 0 }; |
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struct i2c_msg msg[] = { |
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{ |
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.addr = priv->i2c_address, |
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.flags = 0, |
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.buf = b0, |
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.len = 1 |
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}, { |
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.addr = priv->i2c_address, |
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.flags = I2C_M_RD, |
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.buf = b1, |
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.len = 1 |
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} |
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}; |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 1); |
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ret = i2c_transfer(priv->i2c, msg, 2); |
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if (ret != 2) { |
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printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", |
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__func__, reg, ret); |
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return ret; |
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} |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 0); |
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return b1[0]; |
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} |
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static int ts2020_sleep(struct dvb_frontend *fe) |
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{ |
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struct ts2020_priv *priv = fe->tuner_priv; |
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int ret; |
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u8 buf[] = { 10, 0 }; |
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struct i2c_msg msg = { |
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.addr = priv->i2c_address, |
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.flags = 0, |
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.buf = buf, |
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.len = 2 |
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}; |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 1); |
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ret = i2c_transfer(priv->i2c, &msg, 1); |
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if (ret != 1) |
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printk(KERN_ERR "%s: i2c error\n", __func__); |
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if (fe->ops.i2c_gate_ctrl) |
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fe->ops.i2c_gate_ctrl(fe, 0); |
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return (ret == 1) ? 0 : ret; |
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} |
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static int ts2020_init(struct dvb_frontend *fe) |
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{ |
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struct ts2020_priv *priv = fe->tuner_priv; |
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ts2020_writereg(fe, 0x42, 0x73); |
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ts2020_writereg(fe, 0x05, priv->clk_out_div); |
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ts2020_writereg(fe, 0x20, 0x27); |
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ts2020_writereg(fe, 0x07, 0x02); |
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ts2020_writereg(fe, 0x11, 0xff); |
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ts2020_writereg(fe, 0x60, 0xf9); |
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ts2020_writereg(fe, 0x08, 0x01); |
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ts2020_writereg(fe, 0x00, 0x41); |
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return 0; |
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} |
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static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset) |
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{ |
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int ret; |
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ret = ts2020_writereg(fe, 0x51, 0x1f - offset); |
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ret |= ts2020_writereg(fe, 0x51, 0x1f); |
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ret |= ts2020_writereg(fe, 0x50, offset); |
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ret |= ts2020_writereg(fe, 0x50, 0x00); |
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msleep(20); |
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return ret; |
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} |
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static int ts2020_set_tuner_rf(struct dvb_frontend *fe) |
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{ |
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int reg; |
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reg = ts2020_readreg(fe, 0x3d); |
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reg &= 0x7f; |
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if (reg < 0x16) |
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reg = 0xa1; |
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else if (reg == 0x16) |
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reg = 0x99; |
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else |
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reg = 0xf9; |
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ts2020_writereg(fe, 0x60, reg); |
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reg = ts2020_tuner_gate_ctrl(fe, 0x08); |
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return reg; |
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} |
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static int ts2020_set_params(struct dvb_frontend *fe) |
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{ |
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struct dtv_frontend_properties *c = &fe->dtv_property_cache; |
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struct ts2020_priv *priv = fe->tuner_priv; |
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int ret; |
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u32 frequency = c->frequency; |
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s32 offset_khz; |
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u32 symbol_rate = (c->symbol_rate / 1000); |
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u32 f3db, gdiv28; |
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u16 value, ndiv, lpf_coeff; |
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u8 lpf_mxdiv, mlpf_max, mlpf_min, nlpf; |
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u8 lo = 0x01, div4 = 0x0; |
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/* Calculate frequency divider */ |
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if (frequency < priv->frequency_div) { |
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lo |= 0x10; |
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div4 = 0x1; |
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ndiv = (frequency * 14 * 4) / TS2020_XTAL_FREQ; |
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} else |
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ndiv = (frequency * 14 * 2) / TS2020_XTAL_FREQ; |
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ndiv = ndiv + ndiv % 2; |
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ndiv = ndiv - 1024; |
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ret = ts2020_writereg(fe, 0x10, 0x80 | lo); |
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/* Set frequency divider */ |
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ret |= ts2020_writereg(fe, 0x01, (ndiv >> 8) & 0xf); |
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ret |= ts2020_writereg(fe, 0x02, ndiv & 0xff); |
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ret |= ts2020_writereg(fe, 0x03, 0x06); |
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ret |= ts2020_tuner_gate_ctrl(fe, 0x10); |
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if (ret < 0) |
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return -ENODEV; |
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/* Tuner Frequency Range */ |
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ret = ts2020_writereg(fe, 0x10, lo); |
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ret |= ts2020_tuner_gate_ctrl(fe, 0x08); |
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/* Tuner RF */ |
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ret |= ts2020_set_tuner_rf(fe); |
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gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000; |
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ret |= ts2020_writereg(fe, 0x04, gdiv28 & 0xff); |
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ret |= ts2020_tuner_gate_ctrl(fe, 0x04); |
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if (ret < 0) |
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return -ENODEV; |
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value = ts2020_readreg(fe, 0x26); |
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f3db = (symbol_rate * 135) / 200 + 2000; |
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f3db += FREQ_OFFSET_LOW_SYM_RATE; |
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if (f3db < 7000) |
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f3db = 7000; |
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if (f3db > 40000) |
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f3db = 40000; |
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gdiv28 = gdiv28 * 207 / (value * 2 + 151); |
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mlpf_max = gdiv28 * 135 / 100; |
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mlpf_min = gdiv28 * 78 / 100; |
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if (mlpf_max > 63) |
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mlpf_max = 63; |
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lpf_coeff = 2766; |
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nlpf = (f3db * gdiv28 * 2 / lpf_coeff / |
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(TS2020_XTAL_FREQ / 1000) + 1) / 2; |
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if (nlpf > 23) |
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nlpf = 23; |
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if (nlpf < 1) |
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nlpf = 1; |
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lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000) |
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* lpf_coeff * 2 / f3db + 1) / 2; |
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if (lpf_mxdiv < mlpf_min) { |
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nlpf++; |
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lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000) |
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* lpf_coeff * 2 / f3db + 1) / 2; |
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} |
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if (lpf_mxdiv > mlpf_max) |
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lpf_mxdiv = mlpf_max; |
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ret = ts2020_writereg(fe, 0x04, lpf_mxdiv); |
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ret |= ts2020_writereg(fe, 0x06, nlpf); |
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ret |= ts2020_tuner_gate_ctrl(fe, 0x04); |
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ret |= ts2020_tuner_gate_ctrl(fe, 0x01); |
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msleep(80); |
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/* calculate offset assuming 96000kHz*/ |
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offset_khz = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ |
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/ (6 + 8) / (div4 + 1) / 2; |
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priv->frequency = offset_khz; |
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return (ret < 0) ? -EINVAL : 0; |
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} |
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static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency) |
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{ |
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struct ts2020_priv *priv = fe->tuner_priv; |
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*frequency = priv->frequency; |
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return 0; |
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} |
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/* read TS2020 signal strength */ |
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static int ts2020_read_signal_strength(struct dvb_frontend *fe, |
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u16 *signal_strength) |
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{ |
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u16 sig_reading, sig_strength; |
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u8 rfgain, bbgain; |
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rfgain = ts2020_readreg(fe, 0x3d) & 0x1f; |
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bbgain = ts2020_readreg(fe, 0x21) & 0x1f; |
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if (rfgain > 15) |
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rfgain = 15; |
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if (bbgain > 13) |
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bbgain = 13; |
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sig_reading = rfgain * 2 + bbgain * 3; |
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sig_strength = 40 + (64 - sig_reading) * 50 / 64 ; |
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/* cook the value to be suitable for szap-s2 human readable output */ |
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*signal_strength = sig_strength * 1000; |
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return 0; |
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} |
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static struct dvb_tuner_ops ts2020_tuner_ops = { |
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.info = { |
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.name = "TS2020", |
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.frequency_min = 950000, |
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.frequency_max = 2150000 |
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}, |
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.init = ts2020_init, |
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.release = ts2020_release, |
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.sleep = ts2020_sleep, |
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.set_params = ts2020_set_params, |
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.get_frequency = ts2020_get_frequency, |
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.get_rf_strength = ts2020_read_signal_strength, |
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}; |
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struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe, |
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const struct ts2020_config *config, |
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struct i2c_adapter *i2c) |
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{ |
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struct ts2020_priv *priv = NULL; |
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u8 buf; |
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priv = kzalloc(sizeof(struct ts2020_priv), GFP_KERNEL); |
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if (priv == NULL) |
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return NULL; |
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priv->i2c_address = config->tuner_address; |
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priv->i2c = i2c; |
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priv->clk_out_div = config->clk_out_div; |
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priv->frequency_div = config->frequency_div; |
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fe->tuner_priv = priv; |
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if (!priv->frequency_div) |
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priv->frequency_div = 1060000; |
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/* Wake Up the tuner */ |
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if ((0x03 & ts2020_readreg(fe, 0x00)) == 0x00) { |
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ts2020_writereg(fe, 0x00, 0x01); |
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msleep(2); |
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} |
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ts2020_writereg(fe, 0x00, 0x03); |
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msleep(2); |
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/* Check the tuner version */ |
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buf = ts2020_readreg(fe, 0x00); |
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if ((buf == 0x01) || (buf == 0x41) || (buf == 0x81)) |
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printk(KERN_INFO "%s: Find tuner TS2020!\n", __func__); |
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else { |
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printk(KERN_ERR "%s: Read tuner reg[0] = %d\n", __func__, buf); |
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kfree(priv); |
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return NULL; |
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} |
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memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops, |
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sizeof(struct dvb_tuner_ops)); |
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return fe; |
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} |
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EXPORT_SYMBOL(ts2020_attach); |
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MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>"); |
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MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module"); |
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MODULE_LICENSE("GPL");
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