510 lines
12 KiB
C
510 lines
12 KiB
C
/*
|
|
* Support for AltoBeam GB20600 (a.k.a DMB-TH) demodulator
|
|
* ATBM8830, ATBM8831
|
|
*
|
|
* Copyright (C) 2009 David T.L. Wong <davidtlwong@gmail.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 <asm/div64.h>
|
|
#include "dvb_frontend.h"
|
|
|
|
#include "atbm8830.h"
|
|
#include "atbm8830_priv.h"
|
|
|
|
#define dprintk(args...) \
|
|
do { \
|
|
if (debug) \
|
|
printk(KERN_DEBUG "atbm8830: " args); \
|
|
} while (0)
|
|
|
|
static int debug;
|
|
|
|
module_param(debug, int, 0644);
|
|
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
|
|
|
|
static int atbm8830_write_reg(struct atbm_state *priv, u16 reg, u8 data)
|
|
{
|
|
int ret = 0;
|
|
u8 dev_addr;
|
|
u8 buf1[] = { reg >> 8, reg & 0xFF };
|
|
u8 buf2[] = { data };
|
|
struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
|
|
struct i2c_msg msg2 = { .flags = 0, .buf = buf2, .len = 1 };
|
|
|
|
dev_addr = priv->config->demod_address;
|
|
msg1.addr = dev_addr;
|
|
msg2.addr = dev_addr;
|
|
|
|
if (debug >= 2)
|
|
dprintk("%s: reg=0x%04X, data=0x%02X\n", __func__, reg, data);
|
|
|
|
ret = i2c_transfer(priv->i2c, &msg1, 1);
|
|
if (ret != 1)
|
|
return -EIO;
|
|
|
|
ret = i2c_transfer(priv->i2c, &msg2, 1);
|
|
return (ret != 1) ? -EIO : 0;
|
|
}
|
|
|
|
static int atbm8830_read_reg(struct atbm_state *priv, u16 reg, u8 *p_data)
|
|
{
|
|
int ret;
|
|
u8 dev_addr;
|
|
|
|
u8 buf1[] = { reg >> 8, reg & 0xFF };
|
|
u8 buf2[] = { 0 };
|
|
struct i2c_msg msg1 = { .flags = 0, .buf = buf1, .len = 2 };
|
|
struct i2c_msg msg2 = { .flags = I2C_M_RD, .buf = buf2, .len = 1 };
|
|
|
|
dev_addr = priv->config->demod_address;
|
|
msg1.addr = dev_addr;
|
|
msg2.addr = dev_addr;
|
|
|
|
ret = i2c_transfer(priv->i2c, &msg1, 1);
|
|
if (ret != 1) {
|
|
dprintk("%s: error reg=0x%04x, ret=%i\n", __func__, reg, ret);
|
|
return -EIO;
|
|
}
|
|
|
|
ret = i2c_transfer(priv->i2c, &msg2, 1);
|
|
if (ret != 1)
|
|
return -EIO;
|
|
|
|
*p_data = buf2[0];
|
|
if (debug >= 2)
|
|
dprintk("%s: reg=0x%04X, data=0x%02X\n",
|
|
__func__, reg, buf2[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Lock register latch so that multi-register read is atomic */
|
|
static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
|
|
{
|
|
return atbm8830_write_reg(priv, REG_READ_LATCH, lock ? 1 : 0);
|
|
}
|
|
|
|
static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
|
|
{
|
|
u32 val;
|
|
u64 t;
|
|
|
|
/* 0x100000 * freq / 30.4MHz */
|
|
t = (u64)0x100000 * freq;
|
|
do_div(t, 30400);
|
|
val = t;
|
|
|
|
atbm8830_write_reg(priv, REG_OSC_CLK, val);
|
|
atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
|
|
atbm8830_write_reg(priv, REG_OSC_CLK + 2, val >> 16);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
|
|
{
|
|
|
|
u32 fs = priv->config->osc_clk_freq;
|
|
u64 t;
|
|
u32 val;
|
|
u8 dat;
|
|
|
|
if (freq != 0) {
|
|
/* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
|
|
t = (u64) 2 * 31416 * (freq - fs);
|
|
t <<= 22;
|
|
do_div(t, fs);
|
|
do_div(t, 1000);
|
|
val = t;
|
|
|
|
atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
|
|
atbm8830_write_reg(priv, REG_IF_FREQ, val);
|
|
atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);
|
|
atbm8830_write_reg(priv, REG_IF_FREQ+2, val >> 16);
|
|
|
|
atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
|
|
dat &= 0xFC;
|
|
atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
|
|
} else {
|
|
/* Zero IF */
|
|
atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 0);
|
|
|
|
atbm8830_read_reg(priv, REG_ADC_CONFIG, &dat);
|
|
dat &= 0xFC;
|
|
dat |= 0x02;
|
|
atbm8830_write_reg(priv, REG_ADC_CONFIG, dat);
|
|
|
|
if (priv->config->zif_swap_iq)
|
|
atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x03);
|
|
else
|
|
atbm8830_write_reg(priv, REG_SWAP_I_Q, 0x01);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int is_locked(struct atbm_state *priv, u8 *locked)
|
|
{
|
|
u8 status;
|
|
|
|
atbm8830_read_reg(priv, REG_LOCK_STATUS, &status);
|
|
|
|
if (locked != NULL)
|
|
*locked = (status == 1);
|
|
return 0;
|
|
}
|
|
|
|
static int set_agc_config(struct atbm_state *priv,
|
|
u8 min, u8 max, u8 hold_loop)
|
|
{
|
|
/* no effect if both min and max are zero */
|
|
if (!min && !max)
|
|
return 0;
|
|
|
|
atbm8830_write_reg(priv, REG_AGC_MIN, min);
|
|
atbm8830_write_reg(priv, REG_AGC_MAX, max);
|
|
atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_static_channel_mode(struct atbm_state *priv)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 5; i++)
|
|
atbm8830_write_reg(priv, 0x099B + i, 0x08);
|
|
|
|
atbm8830_write_reg(priv, 0x095B, 0x7F);
|
|
atbm8830_write_reg(priv, 0x09CB, 0x01);
|
|
atbm8830_write_reg(priv, 0x09CC, 0x7F);
|
|
atbm8830_write_reg(priv, 0x09CD, 0x7F);
|
|
atbm8830_write_reg(priv, 0x0E01, 0x20);
|
|
|
|
/* For single carrier */
|
|
atbm8830_write_reg(priv, 0x0B03, 0x0A);
|
|
atbm8830_write_reg(priv, 0x0935, 0x10);
|
|
atbm8830_write_reg(priv, 0x0936, 0x08);
|
|
atbm8830_write_reg(priv, 0x093E, 0x08);
|
|
atbm8830_write_reg(priv, 0x096E, 0x06);
|
|
|
|
/* frame_count_max0 */
|
|
atbm8830_write_reg(priv, 0x0B09, 0x00);
|
|
/* frame_count_max1 */
|
|
atbm8830_write_reg(priv, 0x0B0A, 0x08);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int set_ts_config(struct atbm_state *priv)
|
|
{
|
|
const struct atbm8830_config *cfg = priv->config;
|
|
|
|
/*Set parallel/serial ts mode*/
|
|
atbm8830_write_reg(priv, REG_TS_SERIAL, cfg->serial_ts ? 1 : 0);
|
|
atbm8830_write_reg(priv, REG_TS_CLK_MODE, cfg->serial_ts ? 1 : 0);
|
|
/*Set ts sampling edge*/
|
|
atbm8830_write_reg(priv, REG_TS_SAMPLE_EDGE,
|
|
cfg->ts_sampling_edge ? 1 : 0);
|
|
/*Set ts clock freerun*/
|
|
atbm8830_write_reg(priv, REG_TS_CLK_FREERUN,
|
|
cfg->ts_clk_gated ? 0 : 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_init(struct dvb_frontend *fe)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
const struct atbm8830_config *cfg = priv->config;
|
|
|
|
/*Set oscillator frequency*/
|
|
set_osc_freq(priv, cfg->osc_clk_freq);
|
|
|
|
/*Set IF frequency*/
|
|
set_if_freq(priv, cfg->if_freq);
|
|
|
|
/*Set AGC Config*/
|
|
set_agc_config(priv, cfg->agc_min, cfg->agc_max,
|
|
cfg->agc_hold_loop);
|
|
|
|
/*Set static channel mode*/
|
|
set_static_channel_mode(priv);
|
|
|
|
set_ts_config(priv);
|
|
/*Turn off DSP reset*/
|
|
atbm8830_write_reg(priv, 0x000A, 0);
|
|
|
|
/*SW version test*/
|
|
atbm8830_write_reg(priv, 0x020C, 11);
|
|
|
|
/* Run */
|
|
atbm8830_write_reg(priv, REG_DEMOD_RUN, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void atbm8830_release(struct dvb_frontend *fe)
|
|
{
|
|
struct atbm_state *state = fe->demodulator_priv;
|
|
dprintk("%s\n", __func__);
|
|
|
|
kfree(state);
|
|
}
|
|
|
|
static int atbm8830_set_fe(struct dvb_frontend *fe)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
int i;
|
|
u8 locked = 0;
|
|
dprintk("%s\n", __func__);
|
|
|
|
/* set frequency */
|
|
if (fe->ops.tuner_ops.set_params) {
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1);
|
|
fe->ops.tuner_ops.set_params(fe);
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 0);
|
|
}
|
|
|
|
/* start auto lock */
|
|
for (i = 0; i < 10; i++) {
|
|
mdelay(100);
|
|
dprintk("Try %d\n", i);
|
|
is_locked(priv, &locked);
|
|
if (locked != 0) {
|
|
dprintk("ATBM8830 locked!\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_get_fe(struct dvb_frontend *fe,
|
|
struct dtv_frontend_properties *c)
|
|
{
|
|
dprintk("%s\n", __func__);
|
|
|
|
/* TODO: get real readings from device */
|
|
/* inversion status */
|
|
c->inversion = INVERSION_OFF;
|
|
|
|
/* bandwidth */
|
|
c->bandwidth_hz = 8000000;
|
|
|
|
c->code_rate_HP = FEC_AUTO;
|
|
c->code_rate_LP = FEC_AUTO;
|
|
|
|
c->modulation = QAM_AUTO;
|
|
|
|
/* transmission mode */
|
|
c->transmission_mode = TRANSMISSION_MODE_AUTO;
|
|
|
|
/* guard interval */
|
|
c->guard_interval = GUARD_INTERVAL_AUTO;
|
|
|
|
/* hierarchy */
|
|
c->hierarchy = HIERARCHY_NONE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_get_tune_settings(struct dvb_frontend *fe,
|
|
struct dvb_frontend_tune_settings *fesettings)
|
|
{
|
|
fesettings->min_delay_ms = 0;
|
|
fesettings->step_size = 0;
|
|
fesettings->max_drift = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_read_status(struct dvb_frontend *fe,
|
|
enum fe_status *fe_status)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
u8 locked = 0;
|
|
u8 agc_locked = 0;
|
|
|
|
dprintk("%s\n", __func__);
|
|
*fe_status = 0;
|
|
|
|
is_locked(priv, &locked);
|
|
if (locked) {
|
|
*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
|
|
FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
|
|
}
|
|
dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
|
|
|
|
atbm8830_read_reg(priv, REG_AGC_LOCK, &agc_locked);
|
|
dprintk("AGC Lock: %d\n", agc_locked);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_read_ber(struct dvb_frontend *fe, u32 *ber)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
u32 frame_err;
|
|
u8 t;
|
|
|
|
dprintk("%s\n", __func__);
|
|
|
|
atbm8830_reglatch_lock(priv, 1);
|
|
|
|
atbm8830_read_reg(priv, REG_FRAME_ERR_CNT + 1, &t);
|
|
frame_err = t & 0x7F;
|
|
frame_err <<= 8;
|
|
atbm8830_read_reg(priv, REG_FRAME_ERR_CNT, &t);
|
|
frame_err |= t;
|
|
|
|
atbm8830_reglatch_lock(priv, 0);
|
|
|
|
*ber = frame_err * 100 / 32767;
|
|
|
|
dprintk("%s: ber=0x%x\n", __func__, *ber);
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
u32 pwm;
|
|
u8 t;
|
|
|
|
dprintk("%s\n", __func__);
|
|
atbm8830_reglatch_lock(priv, 1);
|
|
|
|
atbm8830_read_reg(priv, REG_AGC_PWM_VAL + 1, &t);
|
|
pwm = t & 0x03;
|
|
pwm <<= 8;
|
|
atbm8830_read_reg(priv, REG_AGC_PWM_VAL, &t);
|
|
pwm |= t;
|
|
|
|
atbm8830_reglatch_lock(priv, 0);
|
|
|
|
dprintk("AGC PWM = 0x%02X\n", pwm);
|
|
pwm = 0x400 - pwm;
|
|
|
|
*signal = pwm * 0x10000 / 0x400;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_read_snr(struct dvb_frontend *fe, u16 *snr)
|
|
{
|
|
dprintk("%s\n", __func__);
|
|
*snr = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
|
|
{
|
|
dprintk("%s\n", __func__);
|
|
*ucblocks = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int atbm8830_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
|
|
{
|
|
struct atbm_state *priv = fe->demodulator_priv;
|
|
|
|
return atbm8830_write_reg(priv, REG_I2C_GATE, enable ? 1 : 0);
|
|
}
|
|
|
|
static struct dvb_frontend_ops atbm8830_ops = {
|
|
.delsys = { SYS_DTMB },
|
|
.info = {
|
|
.name = "AltoBeam ATBM8830/8831 DMB-TH",
|
|
.frequency_min = 474000000,
|
|
.frequency_max = 858000000,
|
|
.frequency_stepsize = 10000,
|
|
.caps =
|
|
FE_CAN_FEC_AUTO |
|
|
FE_CAN_QAM_AUTO |
|
|
FE_CAN_TRANSMISSION_MODE_AUTO |
|
|
FE_CAN_GUARD_INTERVAL_AUTO
|
|
},
|
|
|
|
.release = atbm8830_release,
|
|
|
|
.init = atbm8830_init,
|
|
.sleep = NULL,
|
|
.write = NULL,
|
|
.i2c_gate_ctrl = atbm8830_i2c_gate_ctrl,
|
|
|
|
.set_frontend = atbm8830_set_fe,
|
|
.get_frontend = atbm8830_get_fe,
|
|
.get_tune_settings = atbm8830_get_tune_settings,
|
|
|
|
.read_status = atbm8830_read_status,
|
|
.read_ber = atbm8830_read_ber,
|
|
.read_signal_strength = atbm8830_read_signal_strength,
|
|
.read_snr = atbm8830_read_snr,
|
|
.read_ucblocks = atbm8830_read_ucblocks,
|
|
};
|
|
|
|
struct dvb_frontend *atbm8830_attach(const struct atbm8830_config *config,
|
|
struct i2c_adapter *i2c)
|
|
{
|
|
struct atbm_state *priv = NULL;
|
|
u8 data = 0;
|
|
|
|
dprintk("%s()\n", __func__);
|
|
|
|
if (config == NULL || i2c == NULL)
|
|
return NULL;
|
|
|
|
priv = kzalloc(sizeof(struct atbm_state), GFP_KERNEL);
|
|
if (priv == NULL)
|
|
goto error_out;
|
|
|
|
priv->config = config;
|
|
priv->i2c = i2c;
|
|
|
|
/* check if the demod is there */
|
|
if (atbm8830_read_reg(priv, REG_CHIP_ID, &data) != 0) {
|
|
dprintk("%s atbm8830/8831 not found at i2c addr 0x%02X\n",
|
|
__func__, priv->config->demod_address);
|
|
goto error_out;
|
|
}
|
|
dprintk("atbm8830 chip id: 0x%02X\n", data);
|
|
|
|
memcpy(&priv->frontend.ops, &atbm8830_ops,
|
|
sizeof(struct dvb_frontend_ops));
|
|
priv->frontend.demodulator_priv = priv;
|
|
|
|
atbm8830_init(&priv->frontend);
|
|
|
|
atbm8830_i2c_gate_ctrl(&priv->frontend, 1);
|
|
|
|
return &priv->frontend;
|
|
|
|
error_out:
|
|
dprintk("%s() error_out\n", __func__);
|
|
kfree(priv);
|
|
return NULL;
|
|
|
|
}
|
|
EXPORT_SYMBOL(atbm8830_attach);
|
|
|
|
MODULE_DESCRIPTION("AltoBeam ATBM8830/8831 GB20600 demodulator driver");
|
|
MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|