451 lines
10 KiB
C
451 lines
10 KiB
C
/*
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* at76c651.c
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*
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* Atmel DVB-C Frontend Driver (at76c651/tua6010xs)
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*
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* Copyright (C) 2001 fnbrd <fnbrd@gmx.de>
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* & 2002-2004 Andreas Oberritter <obi@linuxtv.org>
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* & 2003 Wolfram Joost <dbox2@frokaschwei.de>
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*
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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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*
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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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*
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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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* AT76C651
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* http://www.nalanda.nitc.ac.in/industry/datasheets/atmel/acrobat/doc1293.pdf
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* http://www.atmel.com/atmel/acrobat/doc1320.pdf
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/bitops.h>
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#include "dvb_frontend.h"
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#include "at76c651.h"
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struct at76c651_state {
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struct i2c_adapter* i2c;
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struct dvb_frontend_ops ops;
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const struct at76c651_config* config;
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struct dvb_frontend frontend;
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/* revision of the chip */
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u8 revision;
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/* last QAM value set */
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u8 qam;
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};
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static int debug;
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#define dprintk(args...) \
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do { \
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if (debug) printk(KERN_DEBUG "at76c651: " args); \
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} while (0)
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#if ! defined(__powerpc__)
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static __inline__ int __ilog2(unsigned long x)
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{
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int i;
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if (x == 0)
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return -1;
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for (i = 0; x != 0; i++)
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x >>= 1;
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return i - 1;
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}
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#endif
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static int at76c651_writereg(struct at76c651_state* state, u8 reg, u8 data)
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{
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int ret;
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u8 buf[] = { reg, data };
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struct i2c_msg msg =
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{ .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
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ret = i2c_transfer(state->i2c, &msg, 1);
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if (ret != 1)
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dprintk("%s: writereg error "
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"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
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__FUNCTION__, reg, data, ret);
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msleep(10);
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return (ret != 1) ? -EREMOTEIO : 0;
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}
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static u8 at76c651_readreg(struct at76c651_state* state, u8 reg)
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{
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int ret;
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u8 val;
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struct i2c_msg msg[] = {
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{ .addr = state->config->demod_address, .flags = 0, .buf = ®, .len = 1 },
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{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = &val, .len = 1 }
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};
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ret = i2c_transfer(state->i2c, msg, 2);
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if (ret != 2)
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dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
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return val;
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}
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static int at76c651_reset(struct at76c651_state* state)
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{
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return at76c651_writereg(state, 0x07, 0x01);
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}
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static void at76c651_disable_interrupts(struct at76c651_state* state)
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{
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at76c651_writereg(state, 0x0b, 0x00);
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}
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static int at76c651_set_auto_config(struct at76c651_state *state)
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{
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/*
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* Autoconfig
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*/
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at76c651_writereg(state, 0x06, 0x01);
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/*
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* Performance optimizations, should be done after autoconfig
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*/
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at76c651_writereg(state, 0x10, 0x06);
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at76c651_writereg(state, 0x11, ((state->qam == 5) || (state->qam == 7)) ? 0x12 : 0x10);
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at76c651_writereg(state, 0x15, 0x28);
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at76c651_writereg(state, 0x20, 0x09);
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at76c651_writereg(state, 0x24, ((state->qam == 5) || (state->qam == 7)) ? 0xC0 : 0x90);
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at76c651_writereg(state, 0x30, 0x90);
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if (state->qam == 5)
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at76c651_writereg(state, 0x35, 0x2A);
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/*
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* Initialize A/D-converter
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*/
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if (state->revision == 0x11) {
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at76c651_writereg(state, 0x2E, 0x38);
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at76c651_writereg(state, 0x2F, 0x13);
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}
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at76c651_disable_interrupts(state);
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/*
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* Restart operation
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*/
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at76c651_reset(state);
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return 0;
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}
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static void at76c651_set_bbfreq(struct at76c651_state* state)
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{
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at76c651_writereg(state, 0x04, 0x3f);
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at76c651_writereg(state, 0x05, 0xee);
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}
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static int at76c651_set_symbol_rate(struct at76c651_state* state, u32 symbol_rate)
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{
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u8 exponent;
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u32 mantissa;
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if (symbol_rate > 9360000)
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return -EINVAL;
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/*
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* FREF = 57800 kHz
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* exponent = 10 + floor (log2(symbol_rate / FREF))
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* mantissa = (symbol_rate / FREF) * (1 << (30 - exponent))
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*/
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exponent = __ilog2((symbol_rate << 4) / 903125);
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mantissa = ((symbol_rate / 3125) * (1 << (24 - exponent))) / 289;
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at76c651_writereg(state, 0x00, mantissa >> 13);
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at76c651_writereg(state, 0x01, mantissa >> 5);
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at76c651_writereg(state, 0x02, (mantissa << 3) | exponent);
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return 0;
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}
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static int at76c651_set_qam(struct at76c651_state *state, fe_modulation_t qam)
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{
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switch (qam) {
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case QPSK:
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state->qam = 0x02;
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break;
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case QAM_16:
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state->qam = 0x04;
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break;
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case QAM_32:
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state->qam = 0x05;
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break;
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case QAM_64:
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state->qam = 0x06;
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break;
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case QAM_128:
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state->qam = 0x07;
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break;
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case QAM_256:
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state->qam = 0x08;
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break;
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#if 0
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case QAM_512:
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state->qam = 0x09;
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break;
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case QAM_1024:
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state->qam = 0x0A;
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break;
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#endif
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default:
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return -EINVAL;
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}
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return at76c651_writereg(state, 0x03, state->qam);
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}
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static int at76c651_set_inversion(struct at76c651_state* state, fe_spectral_inversion_t inversion)
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{
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u8 feciqinv = at76c651_readreg(state, 0x60);
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switch (inversion) {
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case INVERSION_OFF:
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feciqinv |= 0x02;
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feciqinv &= 0xFE;
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break;
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case INVERSION_ON:
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feciqinv |= 0x03;
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break;
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case INVERSION_AUTO:
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feciqinv &= 0xFC;
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break;
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default:
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return -EINVAL;
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}
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return at76c651_writereg(state, 0x60, feciqinv);
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}
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static int at76c651_set_parameters(struct dvb_frontend* fe,
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struct dvb_frontend_parameters *p)
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{
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int ret;
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struct at76c651_state* state = fe->demodulator_priv;
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at76c651_writereg(state, 0x0c, 0xc3);
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state->config->pll_set(fe, p);
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at76c651_writereg(state, 0x0c, 0xc2);
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if ((ret = at76c651_set_symbol_rate(state, p->u.qam.symbol_rate)))
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return ret;
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if ((ret = at76c651_set_inversion(state, p->inversion)))
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return ret;
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return at76c651_set_auto_config(state);
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}
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static int at76c651_set_defaults(struct dvb_frontend* fe)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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at76c651_set_symbol_rate(state, 6900000);
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at76c651_set_qam(state, QAM_64);
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at76c651_set_bbfreq(state);
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at76c651_set_auto_config(state);
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if (state->config->pll_init) {
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at76c651_writereg(state, 0x0c, 0xc3);
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state->config->pll_init(fe);
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at76c651_writereg(state, 0x0c, 0xc2);
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}
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return 0;
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}
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static int at76c651_read_status(struct dvb_frontend* fe, fe_status_t* status)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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u8 sync;
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/*
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* Bits: FEC, CAR, EQU, TIM, AGC2, AGC1, ADC, PLL (PLL=0)
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*/
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sync = at76c651_readreg(state, 0x80);
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*status = 0;
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if (sync & (0x04 | 0x10)) /* AGC1 || TIM */
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*status |= FE_HAS_SIGNAL;
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if (sync & 0x10) /* TIM */
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*status |= FE_HAS_CARRIER;
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if (sync & 0x80) /* FEC */
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*status |= FE_HAS_VITERBI;
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if (sync & 0x40) /* CAR */
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*status |= FE_HAS_SYNC;
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if ((sync & 0xF0) == 0xF0) /* TIM && EQU && CAR && FEC */
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*status |= FE_HAS_LOCK;
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return 0;
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}
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static int at76c651_read_ber(struct dvb_frontend* fe, u32* ber)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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*ber = (at76c651_readreg(state, 0x81) & 0x0F) << 16;
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*ber |= at76c651_readreg(state, 0x82) << 8;
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*ber |= at76c651_readreg(state, 0x83);
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*ber *= 10;
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return 0;
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}
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static int at76c651_read_signal_strength(struct dvb_frontend* fe, u16* strength)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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u8 gain = ~at76c651_readreg(state, 0x91);
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*strength = (gain << 8) | gain;
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return 0;
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}
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static int at76c651_read_snr(struct dvb_frontend* fe, u16* snr)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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*snr = 0xFFFF -
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((at76c651_readreg(state, 0x8F) << 8) |
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at76c651_readreg(state, 0x90));
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return 0;
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}
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static int at76c651_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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*ucblocks = at76c651_readreg(state, 0x82);
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return 0;
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}
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static int at76c651_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 = 50;
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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 at76c651_release(struct dvb_frontend* fe)
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{
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struct at76c651_state* state = fe->demodulator_priv;
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kfree(state);
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}
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static struct dvb_frontend_ops at76c651_ops;
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struct dvb_frontend* at76c651_attach(const struct at76c651_config* config,
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struct i2c_adapter* i2c)
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{
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struct at76c651_state* state = NULL;
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/* allocate memory for the internal state */
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state = kmalloc(sizeof(struct at76c651_state), GFP_KERNEL);
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if (state == NULL) goto error;
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/* setup the state */
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state->config = config;
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state->qam = 0;
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/* check if the demod is there */
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if (at76c651_readreg(state, 0x0e) != 0x65) goto error;
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/* finalise state setup */
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state->i2c = i2c;
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state->revision = at76c651_readreg(state, 0x0f) & 0xfe;
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memcpy(&state->ops, &at76c651_ops, sizeof(struct dvb_frontend_ops));
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/* create dvb_frontend */
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state->frontend.ops = &state->ops;
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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 at76c651_ops = {
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.info = {
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.name = "Atmel AT76C651B DVB-C",
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.type = FE_QAM,
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.frequency_min = 48250000,
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.frequency_max = 863250000,
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.frequency_stepsize = 62500,
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/*.frequency_tolerance = */ /* FIXME: 12% of SR */
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.symbol_rate_min = 0, /* FIXME */
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.symbol_rate_max = 9360000, /* FIXME */
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.symbol_rate_tolerance = 4000,
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.caps = FE_CAN_INVERSION_AUTO |
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FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
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FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
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FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
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FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | FE_CAN_QAM_128 |
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FE_CAN_MUTE_TS | FE_CAN_QAM_256 | FE_CAN_RECOVER
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},
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.release = at76c651_release,
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.init = at76c651_set_defaults,
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.set_frontend = at76c651_set_parameters,
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.get_tune_settings = at76c651_get_tune_settings,
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.read_status = at76c651_read_status,
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.read_ber = at76c651_read_ber,
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.read_signal_strength = at76c651_read_signal_strength,
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.read_snr = at76c651_read_snr,
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.read_ucblocks = at76c651_read_ucblocks,
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};
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
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MODULE_DESCRIPTION("Atmel AT76C651 DVB-C Demodulator Driver");
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MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(at76c651_attach);
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