/* Conexant 22702 DVB OFDM demodulator driver based on: Alps TDMB7 DVB OFDM demodulator driver Copyright (C) 2001-2002 Convergence Integrated Media GmbH Holger Waechtler <holger@convergence.de> Copyright (C) 2004 Steven Toth <stoth@hauppauge.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 <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/delay.h> #include "dvb_frontend.h" #include "dvb-pll.h" #include "cx22702.h" struct cx22702_state { struct i2c_adapter* i2c; /* configuration settings */ const struct cx22702_config* config; struct dvb_frontend frontend; /* previous uncorrected block counter */ u8 prevUCBlocks; }; static int debug = 0; #define dprintk if (debug) printk /* Register values to initialise the demod */ static u8 init_tab [] = { 0x00, 0x00, /* Stop aquisition */ 0x0B, 0x06, 0x09, 0x01, 0x0D, 0x41, 0x16, 0x32, 0x20, 0x0A, 0x21, 0x17, 0x24, 0x3e, 0x26, 0xff, 0x27, 0x10, 0x28, 0x00, 0x29, 0x00, 0x2a, 0x10, 0x2b, 0x00, 0x2c, 0x10, 0x2d, 0x00, 0x48, 0xd4, 0x49, 0x56, 0x6b, 0x1e, 0xc8, 0x02, 0xf9, 0x00, 0xfa, 0x00, 0xfb, 0x00, 0xfc, 0x00, 0xfd, 0x00, }; static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data) { int ret; u8 buf [] = { reg, data }; struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 }; ret = i2c_transfer(state->i2c, &msg, 1); if (ret != 1) printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n", __FUNCTION__, reg, data, ret); return (ret != 1) ? -1 : 0; } static u8 cx22702_readreg (struct cx22702_state* state, u8 reg) { int ret; u8 b0 [] = { reg }; u8 b1 [] = { 0 }; struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 }, { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } }; ret = i2c_transfer(state->i2c, msg, 2); if (ret != 2) printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret); return b1[0]; } static int cx22702_set_inversion (struct cx22702_state *state, int inversion) { u8 val; switch (inversion) { case INVERSION_AUTO: return -EOPNOTSUPP; case INVERSION_ON: val = cx22702_readreg (state, 0x0C); return cx22702_writereg (state, 0x0C, val | 0x01); case INVERSION_OFF: val = cx22702_readreg (state, 0x0C); return cx22702_writereg (state, 0x0C, val & 0xfe); default: return -EINVAL; } } /* Retrieve the demod settings */ static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p) { u8 val; /* Make sure the TPS regs are valid */ if (!(cx22702_readreg(state, 0x0A) & 0x20)) return -EAGAIN; val = cx22702_readreg (state, 0x01); switch( (val&0x18)>>3) { case 0: p->constellation = QPSK; break; case 1: p->constellation = QAM_16; break; case 2: p->constellation = QAM_64; break; } switch( val&0x07 ) { case 0: p->hierarchy_information = HIERARCHY_NONE; break; case 1: p->hierarchy_information = HIERARCHY_1; break; case 2: p->hierarchy_information = HIERARCHY_2; break; case 3: p->hierarchy_information = HIERARCHY_4; break; } val = cx22702_readreg (state, 0x02); switch( (val&0x38)>>3 ) { case 0: p->code_rate_HP = FEC_1_2; break; case 1: p->code_rate_HP = FEC_2_3; break; case 2: p->code_rate_HP = FEC_3_4; break; case 3: p->code_rate_HP = FEC_5_6; break; case 4: p->code_rate_HP = FEC_7_8; break; } switch( val&0x07 ) { case 0: p->code_rate_LP = FEC_1_2; break; case 1: p->code_rate_LP = FEC_2_3; break; case 2: p->code_rate_LP = FEC_3_4; break; case 3: p->code_rate_LP = FEC_5_6; break; case 4: p->code_rate_LP = FEC_7_8; break; } val = cx22702_readreg (state, 0x03); switch( (val&0x0c)>>2 ) { case 0: p->guard_interval = GUARD_INTERVAL_1_32; break; case 1: p->guard_interval = GUARD_INTERVAL_1_16; break; case 2: p->guard_interval = GUARD_INTERVAL_1_8; break; case 3: p->guard_interval = GUARD_INTERVAL_1_4; break; } switch( val&0x03 ) { case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break; case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break; } return 0; } static int cx22702_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) { struct cx22702_state* state = fe->demodulator_priv; dprintk ("%s(%d)\n", __FUNCTION__, enable); if (enable) return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) & 0xfe); else return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) | 1); } /* Talk to the demod, set the FEC, GUARD, QAM settings etc */ static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p) { u8 val; struct cx22702_state* state = fe->demodulator_priv; if (fe->ops.tuner_ops.set_params) { fe->ops.tuner_ops.set_params(fe, p); if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); } /* set inversion */ cx22702_set_inversion (state, p->inversion); /* set bandwidth */ switch(p->u.ofdm.bandwidth) { case BANDWIDTH_6_MHZ: cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 ); break; case BANDWIDTH_7_MHZ: cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 ); break; case BANDWIDTH_8_MHZ: cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf ); break; default: dprintk ("%s: invalid bandwidth\n",__FUNCTION__); return -EINVAL; } p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working /* use auto configuration? */ if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) || (p->u.ofdm.constellation==QAM_AUTO) || (p->u.ofdm.code_rate_HP==FEC_AUTO) || (p->u.ofdm.code_rate_LP==FEC_AUTO) || (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) || (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) { /* TPS Source - use hardware driven values */ cx22702_writereg(state, 0x06, 0x10); cx22702_writereg(state, 0x07, 0x9); cx22702_writereg(state, 0x08, 0xC1); cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc ); cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 ); cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */ dprintk("%s: Autodetecting\n",__FUNCTION__); return 0; } /* manually programmed values */ val=0; switch(p->u.ofdm.constellation) { case QPSK: val = (val&0xe7); break; case QAM_16: val = (val&0xe7)|0x08; break; case QAM_64: val = (val&0xe7)|0x10; break; default: dprintk ("%s: invalid constellation\n",__FUNCTION__); return -EINVAL; } switch(p->u.ofdm.hierarchy_information) { case HIERARCHY_NONE: val = (val&0xf8); break; case HIERARCHY_1: val = (val&0xf8)|1; break; case HIERARCHY_2: val = (val&0xf8)|2; break; case HIERARCHY_4: val = (val&0xf8)|3; break; default: dprintk ("%s: invalid hierarchy\n",__FUNCTION__); return -EINVAL; } cx22702_writereg (state, 0x06, val); val=0; switch(p->u.ofdm.code_rate_HP) { case FEC_NONE: case FEC_1_2: val = (val&0xc7); break; case FEC_2_3: val = (val&0xc7)|0x08; break; case FEC_3_4: val = (val&0xc7)|0x10; break; case FEC_5_6: val = (val&0xc7)|0x18; break; case FEC_7_8: val = (val&0xc7)|0x20; break; default: dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__); return -EINVAL; } switch(p->u.ofdm.code_rate_LP) { case FEC_NONE: case FEC_1_2: val = (val&0xf8); break; case FEC_2_3: val = (val&0xf8)|1; break; case FEC_3_4: val = (val&0xf8)|2; break; case FEC_5_6: val = (val&0xf8)|3; break; case FEC_7_8: val = (val&0xf8)|4; break; default: dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__); return -EINVAL; } cx22702_writereg (state, 0x07, val); val=0; switch(p->u.ofdm.guard_interval) { case GUARD_INTERVAL_1_32: val = (val&0xf3); break; case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break; case GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break; case GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break; default: dprintk ("%s: invalid guard_interval\n",__FUNCTION__); return -EINVAL; } switch(p->u.ofdm.transmission_mode) { case TRANSMISSION_MODE_2K: val = (val&0xfc); break; case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break; default: dprintk ("%s: invalid transmission_mode\n",__FUNCTION__); return -EINVAL; } cx22702_writereg(state, 0x08, val); cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 ); cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 ); /* Begin channel aquisition */ cx22702_writereg(state, 0x00, 0x01); return 0; } /* Reset the demod hardware and reset all of the configuration registers to a default state. */ static int cx22702_init (struct dvb_frontend* fe) { int i; struct cx22702_state* state = fe->demodulator_priv; cx22702_writereg (state, 0x00, 0x02); msleep(10); for (i=0; i<sizeof(init_tab); i+=2) cx22702_writereg (state, init_tab[i], init_tab[i+1]); cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02); cx22702_i2c_gate_ctrl(fe, 0); return 0; } static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status) { struct cx22702_state* state = fe->demodulator_priv; u8 reg0A; u8 reg23; *status = 0; reg0A = cx22702_readreg (state, 0x0A); reg23 = cx22702_readreg (state, 0x23); dprintk ("%s: status demod=0x%02x agc=0x%02x\n" ,__FUNCTION__,reg0A,reg23); if(reg0A & 0x10) { *status |= FE_HAS_LOCK; *status |= FE_HAS_VITERBI; *status |= FE_HAS_SYNC; } if(reg0A & 0x20) *status |= FE_HAS_CARRIER; if(reg23 < 0xf0) *status |= FE_HAS_SIGNAL; return 0; } static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber) { struct cx22702_state* state = fe->demodulator_priv; if(cx22702_readreg (state, 0xE4) & 0x02) { /* Realtime statistics */ *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7 | (cx22702_readreg (state, 0xDF)&0x7F); } else { /* Averagtine statistics */ *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7 | cx22702_readreg (state, 0xDF); } return 0; } static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) { struct cx22702_state* state = fe->demodulator_priv; *signal_strength = cx22702_readreg (state, 0x23); return 0; } static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr) { struct cx22702_state* state = fe->demodulator_priv; u16 rs_ber=0; if(cx22702_readreg (state, 0xE4) & 0x02) { /* Realtime statistics */ rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7 | (cx22702_readreg (state, 0xDF)& 0x7F); } else { /* Averagine statistics */ rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8 | cx22702_readreg (state, 0xDF); } *snr = ~rs_ber; return 0; } static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) { struct cx22702_state* state = fe->demodulator_priv; u8 _ucblocks; /* RS Uncorrectable Packet Count then reset */ _ucblocks = cx22702_readreg (state, 0xE3); if (state->prevUCBlocks < _ucblocks) *ucblocks = (_ucblocks - state->prevUCBlocks); else *ucblocks = state->prevUCBlocks - _ucblocks; state->prevUCBlocks = _ucblocks; return 0; } static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p) { struct cx22702_state* state = fe->demodulator_priv; u8 reg0C = cx22702_readreg (state, 0x0C); p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF; return cx22702_get_tps (state, &p->u.ofdm); } static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune) { tune->min_delay_ms = 1000; return 0; } static void cx22702_release(struct dvb_frontend* fe) { struct cx22702_state* state = fe->demodulator_priv; kfree(state); } static struct dvb_frontend_ops cx22702_ops; struct dvb_frontend* cx22702_attach(const struct cx22702_config* config, struct i2c_adapter* i2c) { struct cx22702_state* state = NULL; /* allocate memory for the internal state */ state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL); if (state == NULL) goto error; /* setup the state */ state->config = config; state->i2c = i2c; state->prevUCBlocks = 0; /* check if the demod is there */ if (cx22702_readreg(state, 0x1f) != 0x3) goto error; /* create dvb_frontend */ memcpy(&state->frontend.ops, &cx22702_ops, sizeof(struct dvb_frontend_ops)); state->frontend.demodulator_priv = state; return &state->frontend; error: kfree(state); return NULL; } static struct dvb_frontend_ops cx22702_ops = { .info = { .name = "Conexant CX22702 DVB-T", .type = FE_OFDM, .frequency_min = 177000000, .frequency_max = 858000000, .frequency_stepsize = 166666, .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO | FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER }, .release = cx22702_release, .init = cx22702_init, .i2c_gate_ctrl = cx22702_i2c_gate_ctrl, .set_frontend = cx22702_set_tps, .get_frontend = cx22702_get_frontend, .get_tune_settings = cx22702_get_tune_settings, .read_status = cx22702_read_status, .read_ber = cx22702_read_ber, .read_signal_strength = cx22702_read_signal_strength, .read_snr = cx22702_read_snr, .read_ucblocks = cx22702_read_ucblocks, }; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Enable verbose debug messages"); MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver"); MODULE_AUTHOR("Steven Toth"); MODULE_LICENSE("GPL"); EXPORT_SYMBOL(cx22702_attach);