4a3625b221
Change the acquisition range for clock recovery from 120 ppm to 240ppm. Apparently, some cable providers in Germany are playing with their parameters, and the capture range of the ves1820 is too small to acquire a lock with the current setting... ;-( Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
447 lines
11 KiB
C
447 lines
11 KiB
C
/*
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VES1820 - Single Chip Cable Channel Receiver driver module
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Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
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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 <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <asm/div64.h>
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#include "dvb_frontend.h"
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#include "ves1820.h"
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struct ves1820_state {
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struct i2c_adapter* i2c;
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/* configuration settings */
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const struct ves1820_config* config;
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struct dvb_frontend frontend;
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/* private demodulator data */
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u8 reg0;
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u8 pwm;
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};
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static int verbose;
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static u8 ves1820_inittab[] = {
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0x69, 0x6A, 0x93, 0x1A, 0x12, 0x46, 0x26, 0x1A,
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0x43, 0x6A, 0xAA, 0xAA, 0x1E, 0x85, 0x43, 0x20,
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0xE0, 0x00, 0xA1, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
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0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x40
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};
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static int ves1820_writereg(struct ves1820_state *state, u8 reg, u8 data)
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{
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u8 buf[] = { 0x00, reg, data };
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struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 3 };
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int ret;
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ret = i2c_transfer(state->i2c, &msg, 1);
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if (ret != 1)
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printk("ves1820: %s(): writereg error (reg == 0x%02x,"
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"val == 0x%02x, ret == %i)\n", __FUNCTION__, reg, data, ret);
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return (ret != 1) ? -EREMOTEIO : 0;
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}
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static u8 ves1820_readreg(struct ves1820_state *state, u8 reg)
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{
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u8 b0[] = { 0x00, reg };
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u8 b1[] = { 0 };
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struct i2c_msg msg[] = {
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{.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 2},
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{.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
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};
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int ret;
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ret = i2c_transfer(state->i2c, msg, 2);
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if (ret != 2)
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printk("ves1820: %s(): readreg error (reg == 0x%02x,"
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"ret == %i)\n", __FUNCTION__, reg, ret);
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return b1[0];
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}
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static int ves1820_setup_reg0(struct ves1820_state *state, u8 reg0, fe_spectral_inversion_t inversion)
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{
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reg0 |= state->reg0 & 0x62;
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if (INVERSION_ON == inversion) {
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if (!state->config->invert) reg0 |= 0x20;
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else reg0 &= ~0x20;
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} else if (INVERSION_OFF == inversion) {
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if (!state->config->invert) reg0 &= ~0x20;
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else reg0 |= 0x20;
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}
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ves1820_writereg(state, 0x00, reg0 & 0xfe);
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ves1820_writereg(state, 0x00, reg0 | 0x01);
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state->reg0 = reg0;
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return 0;
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}
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static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate)
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{
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s32 BDR;
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s32 BDRI;
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s16 SFIL = 0;
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u16 NDEC = 0;
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u32 ratio;
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u32 fin;
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u32 tmp;
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u64 fptmp;
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u64 fpxin;
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if (symbolrate > state->config->xin / 2)
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symbolrate = state->config->xin / 2;
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if (symbolrate < 500000)
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symbolrate = 500000;
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if (symbolrate < state->config->xin / 16)
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NDEC = 1;
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if (symbolrate < state->config->xin / 32)
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NDEC = 2;
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if (symbolrate < state->config->xin / 64)
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NDEC = 3;
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/* yeuch! */
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fpxin = state->config->xin * 10;
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fptmp = fpxin; do_div(fptmp, 123);
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if (symbolrate < fptmp)
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SFIL = 1;
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fptmp = fpxin; do_div(fptmp, 160);
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if (symbolrate < fptmp)
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SFIL = 0;
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fptmp = fpxin; do_div(fptmp, 246);
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if (symbolrate < fptmp)
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SFIL = 1;
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fptmp = fpxin; do_div(fptmp, 320);
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if (symbolrate < fptmp)
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SFIL = 0;
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fptmp = fpxin; do_div(fptmp, 492);
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if (symbolrate < fptmp)
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SFIL = 1;
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fptmp = fpxin; do_div(fptmp, 640);
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if (symbolrate < fptmp)
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SFIL = 0;
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fptmp = fpxin; do_div(fptmp, 984);
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if (symbolrate < fptmp)
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SFIL = 1;
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fin = state->config->xin >> 4;
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symbolrate <<= NDEC;
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ratio = (symbolrate << 4) / fin;
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tmp = ((symbolrate << 4) % fin) << 8;
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ratio = (ratio << 8) + tmp / fin;
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tmp = (tmp % fin) << 8;
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ratio = (ratio << 8) + (tmp + fin / 2) / fin;
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BDR = ratio;
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BDRI = (((state->config->xin << 5) / symbolrate) + 1) / 2;
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if (BDRI > 0xFF)
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BDRI = 0xFF;
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SFIL = (SFIL << 4) | ves1820_inittab[0x0E];
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NDEC = (NDEC << 6) | ves1820_inittab[0x03];
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ves1820_writereg(state, 0x03, NDEC);
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ves1820_writereg(state, 0x0a, BDR & 0xff);
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ves1820_writereg(state, 0x0b, (BDR >> 8) & 0xff);
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ves1820_writereg(state, 0x0c, (BDR >> 16) & 0x3f);
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ves1820_writereg(state, 0x0d, BDRI);
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ves1820_writereg(state, 0x0e, SFIL);
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return 0;
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}
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static int ves1820_init(struct dvb_frontend* fe)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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int i;
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ves1820_writereg(state, 0, 0);
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for (i = 0; i < sizeof(ves1820_inittab); i++)
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ves1820_writereg(state, i, ves1820_inittab[i]);
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if (state->config->selagc)
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ves1820_writereg(state, 2, ves1820_inittab[2] | 0x08);
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ves1820_writereg(state, 0x34, state->pwm);
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return 0;
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}
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static int ves1820_set_parameters(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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static const u8 reg0x00[] = { 0x00, 0x04, 0x08, 0x0c, 0x10 };
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static const u8 reg0x01[] = { 140, 140, 106, 100, 92 };
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static const u8 reg0x05[] = { 135, 100, 70, 54, 38 };
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static const u8 reg0x08[] = { 162, 116, 67, 52, 35 };
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static const u8 reg0x09[] = { 145, 150, 106, 126, 107 };
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int real_qam = p->u.qam.modulation - QAM_16;
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if (real_qam < 0 || real_qam > 4)
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return -EINVAL;
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if (fe->ops.tuner_ops.set_params) {
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fe->ops.tuner_ops.set_params(fe, p);
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if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
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}
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ves1820_set_symbolrate(state, p->u.qam.symbol_rate);
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ves1820_writereg(state, 0x34, state->pwm);
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ves1820_writereg(state, 0x01, reg0x01[real_qam]);
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ves1820_writereg(state, 0x05, reg0x05[real_qam]);
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ves1820_writereg(state, 0x08, reg0x08[real_qam]);
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ves1820_writereg(state, 0x09, reg0x09[real_qam]);
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ves1820_setup_reg0(state, reg0x00[real_qam], p->inversion);
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ves1820_writereg(state, 2, ves1820_inittab[2] | (state->config->selagc ? 0x08 : 0));
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return 0;
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}
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static int ves1820_read_status(struct dvb_frontend* fe, fe_status_t* status)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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int sync;
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*status = 0;
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sync = ves1820_readreg(state, 0x11);
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if (sync & 1)
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*status |= FE_HAS_SIGNAL;
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if (sync & 2)
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*status |= FE_HAS_CARRIER;
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if (sync & 2) /* XXX FIXME! */
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*status |= FE_HAS_VITERBI;
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if (sync & 4)
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*status |= FE_HAS_SYNC;
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if (sync & 8)
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*status |= FE_HAS_LOCK;
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return 0;
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}
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static int ves1820_read_ber(struct dvb_frontend* fe, u32* ber)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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u32 _ber = ves1820_readreg(state, 0x14) |
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(ves1820_readreg(state, 0x15) << 8) |
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((ves1820_readreg(state, 0x16) & 0x0f) << 16);
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*ber = 10 * _ber;
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return 0;
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}
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static int ves1820_read_signal_strength(struct dvb_frontend* fe, u16* strength)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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u8 gain = ves1820_readreg(state, 0x17);
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*strength = (gain << 8) | gain;
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return 0;
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}
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static int ves1820_read_snr(struct dvb_frontend* fe, u16* snr)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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u8 quality = ~ves1820_readreg(state, 0x18);
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*snr = (quality << 8) | quality;
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return 0;
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}
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static int ves1820_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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*ucblocks = ves1820_readreg(state, 0x13) & 0x7f;
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if (*ucblocks == 0x7f)
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*ucblocks = 0xffffffff;
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/* reset uncorrected block counter */
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ves1820_writereg(state, 0x10, ves1820_inittab[0x10] & 0xdf);
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ves1820_writereg(state, 0x10, ves1820_inittab[0x10]);
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return 0;
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}
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static int ves1820_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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int sync;
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s8 afc = 0;
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sync = ves1820_readreg(state, 0x11);
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afc = ves1820_readreg(state, 0x19);
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if (verbose) {
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/* AFC only valid when carrier has been recovered */
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printk(sync & 2 ? "ves1820: AFC (%d) %dHz\n" :
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"ves1820: [AFC (%d) %dHz]\n", afc, -((s32) p->u.qam.symbol_rate * afc) >> 10);
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}
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if (!state->config->invert) {
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p->inversion = (state->reg0 & 0x20) ? INVERSION_ON : INVERSION_OFF;
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} else {
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p->inversion = (!(state->reg0 & 0x20)) ? INVERSION_ON : INVERSION_OFF;
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}
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p->u.qam.modulation = ((state->reg0 >> 2) & 7) + QAM_16;
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p->u.qam.fec_inner = FEC_NONE;
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p->frequency = ((p->frequency + 31250) / 62500) * 62500;
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if (sync & 2)
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p->frequency -= ((s32) p->u.qam.symbol_rate * afc) >> 10;
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return 0;
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}
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static int ves1820_sleep(struct dvb_frontend* fe)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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ves1820_writereg(state, 0x1b, 0x02); /* pdown ADC */
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ves1820_writereg(state, 0x00, 0x80); /* standby */
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return 0;
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}
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static int ves1820_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
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{
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fesettings->min_delay_ms = 200;
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fesettings->step_size = 0;
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fesettings->max_drift = 0;
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return 0;
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}
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static void ves1820_release(struct dvb_frontend* fe)
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{
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struct ves1820_state* state = fe->demodulator_priv;
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kfree(state);
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}
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static struct dvb_frontend_ops ves1820_ops;
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struct dvb_frontend* ves1820_attach(const struct ves1820_config* config,
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struct i2c_adapter* i2c,
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u8 pwm)
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{
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struct ves1820_state* state = NULL;
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/* allocate memory for the internal state */
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state = kmalloc(sizeof(struct ves1820_state), GFP_KERNEL);
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if (state == NULL)
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goto error;
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/* setup the state */
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state->reg0 = ves1820_inittab[0];
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state->config = config;
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state->i2c = i2c;
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state->pwm = pwm;
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/* check if the demod is there */
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if ((ves1820_readreg(state, 0x1a) & 0xf0) != 0x70)
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goto error;
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if (verbose)
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printk("ves1820: pwm=0x%02x\n", state->pwm);
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/* create dvb_frontend */
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memcpy(&state->frontend.ops, &ves1820_ops, sizeof(struct dvb_frontend_ops));
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state->frontend.ops.info.symbol_rate_min = (state->config->xin / 2) / 64; /* SACLK/64 == (XIN/2)/64 */
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state->frontend.ops.info.symbol_rate_max = (state->config->xin / 2) / 4; /* SACLK/4 */
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state->frontend.demodulator_priv = state;
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return &state->frontend;
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error:
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kfree(state);
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return NULL;
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}
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static struct dvb_frontend_ops ves1820_ops = {
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.info = {
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.name = "VLSI VES1820 DVB-C",
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.type = FE_QAM,
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.frequency_stepsize = 62500,
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.frequency_min = 47000000,
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.frequency_max = 862000000,
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.caps = FE_CAN_QAM_16 |
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FE_CAN_QAM_32 |
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FE_CAN_QAM_64 |
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FE_CAN_QAM_128 |
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FE_CAN_QAM_256 |
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FE_CAN_FEC_AUTO
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},
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.release = ves1820_release,
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.init = ves1820_init,
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.sleep = ves1820_sleep,
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.set_frontend = ves1820_set_parameters,
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.get_frontend = ves1820_get_frontend,
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.get_tune_settings = ves1820_get_tune_settings,
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.read_status = ves1820_read_status,
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.read_ber = ves1820_read_ber,
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.read_signal_strength = ves1820_read_signal_strength,
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.read_snr = ves1820_read_snr,
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.read_ucblocks = ves1820_read_ucblocks,
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};
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module_param(verbose, int, 0644);
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MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
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MODULE_DESCRIPTION("VLSI VES1820 DVB-C Demodulator driver");
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MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(ves1820_attach);
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