/*
* at76c651.c
*
* Atmel DVB-C Frontend Driver (at76c651/dat7021)
*
* Copyright (C) 2001 fnbrd <fnbrd@gmx.de>
* & 2002 Andreas Oberritter <obi@linuxtv.org>
* & 2003 Wolfram Joost <dbox2@frokaschwei.de>
*
* 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/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#if defined(__powerpc__)
#include <asm/bitops.h>
#endif
#include "dvb_frontend.h"
#include "dvb_i2c.h"
#include "dvb_functions.h"
static int debug = 0;
static u8 at76c651_qam;
static u8 at76c651_revision;
#define dprintk if (debug) printk
/*
* DAT7021
* -------
* Input Frequency Range (RF): 48.25 MHz to 863.25 MHz
* Band Width: 8 MHz
* Level Input (Range for Digital Signals): -61 dBm to -41 dBm
* Output Frequency (IF): 36 MHz
*
* (see http://www.atmel.com/atmel/acrobat/doc1320.pdf)
*/
static struct dvb_frontend_info at76c651_info = {
.name = "Atmel AT76C651(B) with DAT7021",
.type = FE_QAM,
.frequency_min = 48250000,
.frequency_max = 863250000,
.frequency_stepsize = 62500,
/*.frequency_tolerance = */ /* FIXME: 12% of SR */
.symbol_rate_min = 0, /* FIXME */
.symbol_rate_max = 9360000, /* FIXME */
.symbol_rate_tolerance = 4000,
.notifier_delay = 0,
.caps = FE_CAN_INVERSION_AUTO |
FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | FE_CAN_QAM_128 |
FE_CAN_MUTE_TS | FE_CAN_QAM_256 | FE_CAN_RECOVER
};
#if ! defined(__powerpc__)
static __inline__ int __ilog2(unsigned long x)
{
int i;
if (x == 0)
return -1;
for (i = 0; x != 0; i++)
x >>= 1;
return i - 1;
}
#endif
static int at76c651_writereg(struct dvb_i2c_bus *i2c, u8 reg, u8 data)
{
int ret;
u8 buf[] = { reg, data };
struct i2c_msg msg = { .addr = 0x1a >> 1, .flags = 0, .buf = buf, .len = 2 };
ret = i2c->xfer(i2c, &msg, 1);
if (ret != 1)
dprintk("%s: writereg error "
"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__FUNCTION__, reg, data, ret);
dvb_delay(10);
return (ret != 1) ? -EREMOTEIO : 0;
}
static u8 at76c651_readreg(struct dvb_i2c_bus *i2c, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg[] = { {.addr = 0x1a >> 1, .flags = 0, .buf = b0, .len = 1},
{.addr = 0x1a >> 1, .flags = I2C_M_RD, .buf = b1, .len = 1} };
ret = i2c->xfer(i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
return b1[0];
}
static int at76c651_reset(struct dvb_i2c_bus *i2c)
{
return at76c651_writereg(i2c, 0x07, 0x01);
}
static int at76c651_disable_interrupts(struct dvb_i2c_bus *i2c)
{
return at76c651_writereg(i2c, 0x0b, 0x00);
}
static int at76c651_set_auto_config(struct dvb_i2c_bus *i2c)
{
/*
* Autoconfig
*/
at76c651_writereg(i2c, 0x06, 0x01);
/*
* Performance optimizations, should be done after autoconfig
*/
at76c651_writereg(i2c, 0x10, 0x06);
at76c651_writereg(i2c, 0x11, ((at76c651_qam == 5) || (at76c651_qam == 7)) ? 0x12 : 0x10);
at76c651_writereg(i2c, 0x15, 0x28);
at76c651_writereg(i2c, 0x20, 0x09);
at76c651_writereg(i2c, 0x24, ((at76c651_qam == 5) || (at76c651_qam == 7)) ? 0xC0 : 0x90);
at76c651_writereg(i2c, 0x30, 0x90);
if (at76c651_qam == 5)
at76c651_writereg(i2c, 0x35, 0x2A);
/*
* Initialize A/D-converter
*/
if (at76c651_revision == 0x11) {
at76c651_writereg(i2c, 0x2E, 0x38);
at76c651_writereg(i2c, 0x2F, 0x13);
}
at76c651_disable_interrupts(i2c);
/*
* Restart operation
*/
at76c651_reset(i2c);
return 0;
}
static int at76c651_set_bbfreq(struct dvb_i2c_bus *i2c)
{
at76c651_writereg(i2c, 0x04, 0x3f);
at76c651_writereg(i2c, 0x05, 0xee);
return 0;
}
static int at76c651_switch_tuner_i2c(struct dvb_i2c_bus *i2c, u8 enable)
{
if (enable)
return at76c651_writereg(i2c, 0x0c, 0xc2 | 0x01);
else
return at76c651_writereg(i2c, 0x0c, 0xc2);
}
static int dat7021_write(struct dvb_i2c_bus *i2c, u32 tw)
{
int ret;
struct i2c_msg msg =
{ .addr = 0xc2 >> 1, .flags = 0, .buf = (u8 *) & tw, .len = sizeof (tw) };
#ifdef __LITTLE_ENDIAN
tw = __cpu_to_be32(tw);
#endif
at76c651_switch_tuner_i2c(i2c, 1);
ret = i2c->xfer(i2c, &msg, 1);
at76c651_switch_tuner_i2c(i2c, 0);
if (ret != 4)
return -EFAULT;
at76c651_reset(i2c);
return 0;
}
static int dat7021_set_tv_freq(struct dvb_i2c_bus *i2c, u32 freq)
{
u32 dw;
freq /= 1000;
if ((freq < 48250) || (freq > 863250))
return -EINVAL;
/*
* formula: dw=0x17e28e06+(freq-346000UL)/8000UL*0x800000
* or: dw=0x4E28E06+(freq-42000) / 125 * 0x20000
*/
dw = (freq - 42000) * 4096;
dw = dw / 125;
dw = dw * 32;
if (freq > 394000)
dw += 0x4E28E85;
else
dw += 0x4E28E06;
return dat7021_write(i2c, dw);
}
static int at76c651_set_symbolrate(struct dvb_i2c_bus *i2c, u32 symbolrate)
{
u8 exponent;
u32 mantissa;
if (symbolrate > 9360000)
return -EINVAL;
/*
* FREF = 57800 kHz
* exponent = 10 + floor ( log2 ( symbolrate / FREF ) )
* mantissa = ( symbolrate / FREF) * ( 1 << ( 30 - exponent ) )
*/
exponent = __ilog2((symbolrate << 4) / 903125);
mantissa = ((symbolrate / 3125) * (1 << (24 - exponent))) / 289;
at76c651_writereg(i2c, 0x00, mantissa >> 13);
at76c651_writereg(i2c, 0x01, mantissa >> 5);
at76c651_writereg(i2c, 0x02, (mantissa << 3) | exponent);
return 0;
}
static int at76c651_set_qam(struct dvb_i2c_bus *i2c, fe_modulation_t qam)
{
switch (qam) {
case QPSK:
at76c651_qam = 0x02;
break;
case QAM_16:
at76c651_qam = 0x04;
break;
case QAM_32:
at76c651_qam = 0x05;
break;
case QAM_64:
at76c651_qam = 0x06;
break;
case QAM_128:
at76c651_qam = 0x07;
break;
case QAM_256:
at76c651_qam = 0x08;
break;
#if 0
case QAM_512:
at76c651_qam = 0x09;
break;
case QAM_1024:
at76c651_qam = 0x0A;
break;
#endif
default:
return -EINVAL;
}
return at76c651_writereg(i2c, 0x03, at76c651_qam);
}
static int at76c651_set_inversion(struct dvb_i2c_bus *i2c,
fe_spectral_inversion_t inversion)
{
u8 feciqinv = at76c651_readreg(i2c, 0x60);
switch (inversion) {
case INVERSION_OFF:
feciqinv |= 0x02;
feciqinv &= 0xFE;
break;
case INVERSION_ON:
feciqinv |= 0x03;
break;
case INVERSION_AUTO:
feciqinv &= 0xFC;
break;
default:
return -EINVAL;
}
return at76c651_writereg(i2c, 0x60, feciqinv);
}
static int at76c651_set_parameters(struct dvb_i2c_bus *i2c,
struct dvb_frontend_parameters *p)
{
dat7021_set_tv_freq(i2c, p->frequency);
at76c651_set_symbolrate(i2c, p->u.qam.symbol_rate);
at76c651_set_inversion(i2c, p->inversion);
at76c651_set_auto_config(i2c);
at76c651_reset(i2c);
return 0;
}
static int at76c651_set_defaults(struct dvb_i2c_bus *i2c)
{
at76c651_set_symbolrate(i2c, 6900000);
at76c651_set_qam(i2c, QAM_64);
at76c651_set_bbfreq(i2c);
at76c651_set_auto_config(i2c);
return 0;
}
static int at76c651_ioctl(struct dvb_frontend *fe, unsigned int cmd, void *arg)
{
switch (cmd) {
case FE_GET_INFO:
memcpy(arg, &at76c651_info, sizeof (struct dvb_frontend_info));
break;
case FE_READ_STATUS:
{
fe_status_t *status = (fe_status_t *) arg;
u8 sync;
/*
* Bits: FEC, CAR, EQU, TIM, AGC2, AGC1, ADC, PLL (PLL=0)
*/
sync = at76c651_readreg(fe->i2c, 0x80);
*status = 0;
if (sync & (0x04 | 0x10)) /* AGC1 || TIM */
*status |= FE_HAS_SIGNAL;
if (sync & 0x10) /* TIM */
*status |= FE_HAS_CARRIER;
if (sync & 0x80) /* FEC */
*status |= FE_HAS_VITERBI;
if (sync & 0x40) /* CAR */
*status |= FE_HAS_SYNC;
if ((sync & 0xF0) == 0xF0) /* TIM && EQU && CAR && FEC */
*status |= FE_HAS_LOCK;
break;
}
case FE_READ_BER:
{
u32 *ber = (u32 *) arg;
*ber = (at76c651_readreg(fe->i2c, 0x81) & 0x0F) << 16;
*ber |= at76c651_readreg(fe->i2c, 0x82) << 8;
*ber |= at76c651_readreg(fe->i2c, 0x83);
*ber *= 10;
break;
}
case FE_READ_SIGNAL_STRENGTH:
{
u8 gain = ~at76c651_readreg(fe->i2c, 0x91);
*(u16 *) arg = (gain << 8) | gain;
break;
}
case FE_READ_SNR:
*(u16 *) arg =
0xFFFF -
((at76c651_readreg(fe->i2c, 0x8F) << 8) |
at76c651_readreg(fe->i2c, 0x90));
break;
case FE_READ_UNCORRECTED_BLOCKS:
*(u32 *) arg = at76c651_readreg(fe->i2c, 0x82);
break;
case FE_SET_FRONTEND:
return at76c651_set_parameters(fe->i2c, arg);
case FE_GET_FRONTEND:
break;
case FE_SLEEP:
break;
case FE_INIT:
return at76c651_set_defaults(fe->i2c);
case FE_GET_TUNE_SETTINGS:
{
struct dvb_frontend_tune_settings* fesettings = (struct dvb_frontend_tune_settings*) arg;
fesettings->min_delay_ms = 50;
fesettings->step_size = 0;
fesettings->max_drift = 0;
return 0;
}
default:
return -ENOIOCTLCMD;
}
return 0;
}
static int at76c651_attach(struct dvb_i2c_bus *i2c, void **data)
{
if ( (at76c651_readreg(i2c, 0x0E) != 0x65) ||
( ( (at76c651_revision = at76c651_readreg(i2c, 0x0F)) & 0xFE) != 0x10) )
{
dprintk("no AT76C651(B) found\n");
return -ENODEV;
}
if (at76c651_revision == 0x10)
{
dprintk("AT76C651A found\n");
strcpy(at76c651_info.name,"Atmel AT76C651A with DAT7021");
}
else
{
strcpy(at76c651_info.name,"Atmel AT76C651B with DAT7021");
dprintk("AT76C651B found\n");
}
at76c651_set_defaults(i2c);
return dvb_register_frontend(at76c651_ioctl, i2c, NULL, &at76c651_info);
}
static void at76c651_detach(struct dvb_i2c_bus *i2c, void *data)
{
dvb_unregister_frontend(at76c651_ioctl, i2c);
}
static int __init at76c651_init(void)
{
return dvb_register_i2c_device(THIS_MODULE, at76c651_attach,
at76c651_detach);
}
static void __exit at76c651_exit(void)
{
dvb_unregister_i2c_device(at76c651_attach);
}
module_init(at76c651_init);
module_exit(at76c651_exit);
MODULE_DESCRIPTION("at76c651/dat7021 dvb-c frontend driver");
MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
MODULE_LICENSE("GPL");
MODULE_PARM(debug, "i");
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