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kernel-ark/drivers/media/dvb/frontends/zl10353.c
Chris Pascoe fc3398d8b3 V4L/DVB (4496): Tuning tweaks for ZL10353 
More register setup which improves the ZL10353's tuning characteristics.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-09-26 12:30:32 -03:00

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/*
* Driver for Zarlink DVB-T ZL10353 demodulator
*
* Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
*
* 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/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "zl10353_priv.h"
#include "zl10353.h"
struct zl10353_state {
struct i2c_adapter *i2c;
struct dvb_frontend frontend;
struct zl10353_config config;
};
static int debug_regs = 0;
static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
{
struct zl10353_state *state = fe->demodulator_priv;
u8 buf[2] = { reg, val };
struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
.buf = buf, .len = 2 };
int err = i2c_transfer(state->i2c, &msg, 1);
if (err != 1) {
printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
return err;
}
return 0;
}
int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
{
int err, i;
for (i = 0; i < ilen - 1; i++)
if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
return err;
return 0;
}
static int zl10353_read_register(struct zl10353_state *state, u8 reg)
{
int ret;
u8 b0[1] = { reg };
u8 b1[1] = { 0 };
struct i2c_msg msg[2] = { { .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 (reg=%d, ret==%i)\n",
__FUNCTION__, reg, ret);
return ret;
}
return b1[0];
}
static void zl10353_dump_regs(struct dvb_frontend *fe)
{
struct zl10353_state *state = fe->demodulator_priv;
char buf[52], buf2[4];
int ret;
u8 reg;
/* Dump all registers. */
for (reg = 0; ; reg++) {
if (reg % 16 == 0) {
if (reg)
printk(KERN_DEBUG "%s\n", buf);
sprintf(buf, "%02x: ", reg);
}
ret = zl10353_read_register(state, reg);
if (ret >= 0)
sprintf(buf2, "%02x ", (u8)ret);
else
strcpy(buf2, "-- ");
strcat(buf, buf2);
if (reg == 0xff)
break;
}
printk(KERN_DEBUG "%s\n", buf);
}
static int zl10353_sleep(struct dvb_frontend *fe)
{
static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
return 0;
}
static int zl10353_set_parameters(struct dvb_frontend *fe,
struct dvb_frontend_parameters *param)
{
struct zl10353_state *state = fe->demodulator_priv;
u8 pllbuf[6] = { 0x67 };
/* These settings set "auto-everything" and start the FSM. */
zl10353_single_write(fe, 0x55, 0x80);
udelay(200);
zl10353_single_write(fe, 0xEA, 0x01);
udelay(200);
zl10353_single_write(fe, 0xEA, 0x00);
zl10353_single_write(fe, 0x56, 0x28);
zl10353_single_write(fe, 0x89, 0x20);
zl10353_single_write(fe, 0x5E, 0x00);
zl10353_single_write(fe, 0x65, 0x5A);
zl10353_single_write(fe, 0x66, 0xE9);
zl10353_single_write(fe, 0x6C, 0xCD);
zl10353_single_write(fe, 0x6D, 0x7E);
zl10353_single_write(fe, 0x62, 0x0A);
// if there is no attached secondary tuner, we call set_params to program
// a potential tuner attached somewhere else
if (state->config.no_tuner) {
if (fe->ops.tuner_ops.set_params) {
fe->ops.tuner_ops.set_params(fe, param);
if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
}
}
// if pllbuf is defined, retrieve the settings
if (fe->ops.tuner_ops.calc_regs) {
fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
pllbuf[1] <<= 1;
} else {
// fake pllbuf settings
pllbuf[1] = 0x61 << 1;
pllbuf[2] = 0;
pllbuf[3] = 0;
pllbuf[3] = 0;
pllbuf[4] = 0;
}
// there is no call to _just_ start decoding, so we send the pllbuf anyway
// even if there isn't a PLL attached to the secondary bus
zl10353_write(fe, pllbuf, sizeof(pllbuf));
zl10353_single_write(fe, 0x5F, 0x13);
zl10353_single_write(fe, 0x70, 0x01);
udelay(250);
zl10353_single_write(fe, 0xE4, 0x00);
zl10353_single_write(fe, 0xE5, 0x2A);
zl10353_single_write(fe, 0xE9, 0x02);
zl10353_single_write(fe, 0xE7, 0x40);
zl10353_single_write(fe, 0xE8, 0x10);
return 0;
}
static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct zl10353_state *state = fe->demodulator_priv;
int s6, s7, s8;
if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
return -EREMOTEIO;
if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
return -EREMOTEIO;
if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
return -EREMOTEIO;
*status = 0;
if (s6 & (1 << 2))
*status |= FE_HAS_CARRIER;
if (s6 & (1 << 1))
*status |= FE_HAS_VITERBI;
if (s6 & (1 << 5))
*status |= FE_HAS_LOCK;
if (s7 & (1 << 4))
*status |= FE_HAS_SYNC;
if (s8 & (1 << 6))
*status |= FE_HAS_SIGNAL;
if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
*status &= ~FE_HAS_LOCK;
return 0;
}
static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct zl10353_state *state = fe->demodulator_priv;
u8 _snr;
if (debug_regs)
zl10353_dump_regs(fe);
_snr = zl10353_read_register(state, SNR);
*snr = (_snr << 8) | _snr;
return 0;
}
static int zl10353_get_tune_settings(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings
*fe_tune_settings)
{
fe_tune_settings->min_delay_ms = 1000;
fe_tune_settings->step_size = 0;
fe_tune_settings->max_drift = 0;
return 0;
}
static int zl10353_init(struct dvb_frontend *fe)
{
struct zl10353_state *state = fe->demodulator_priv;
u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
int rc = 0;
if (debug_regs)
zl10353_dump_regs(fe);
if (state->config.parallel_ts)
zl10353_reset_attach[2] &= ~0x20;
/* Do a "hard" reset if not already done */
if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
rc = zl10353_write(fe, zl10353_reset_attach,
sizeof(zl10353_reset_attach));
if (debug_regs)
zl10353_dump_regs(fe);
}
return 0;
}
static void zl10353_release(struct dvb_frontend *fe)
{
struct zl10353_state *state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops zl10353_ops;
struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
struct i2c_adapter *i2c)
{
struct zl10353_state *state = NULL;
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
if (state == NULL)
goto error;
/* setup the state */
state->i2c = i2c;
memcpy(&state->config, config, sizeof(struct zl10353_config));
/* check if the demod is there */
if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
goto error;
/* create dvb_frontend */
memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
kfree(state);
return NULL;
}
static struct dvb_frontend_ops zl10353_ops = {
.info = {
.name = "Zarlink ZL10353 DVB-T",
.type = FE_OFDM,
.frequency_min = 174000000,
.frequency_max = 862000000,
.frequency_stepsize = 166667,
.frequency_tolerance = 0,
.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_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
FE_CAN_MUTE_TS
},
.release = zl10353_release,
.init = zl10353_init,
.sleep = zl10353_sleep,
.write = zl10353_write,
.set_frontend = zl10353_set_parameters,
.get_tune_settings = zl10353_get_tune_settings,
.read_status = zl10353_read_status,
.read_snr = zl10353_read_snr,
};
module_param(debug_regs, int, 0644);
MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
MODULE_AUTHOR("Chris Pascoe");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(zl10353_attach);
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