- 根目录:
- drivers
- media
- dvb
- frontends
- lgs8gl5.c
/*
Legend Silicon LGS-8GL5 DMB-TH OFDM demodulator driver
Copyright (C) 2008 Sirius International (Hong Kong) Limited
Timothy Lee <timothy.lee@siriushk.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 <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "lgs8gl5.h"
#define REG_RESET 0x02
#define REG_RESET_OFF 0x01
#define REG_03 0x03
#define REG_04 0x04
#define REG_07 0x07
#define REG_09 0x09
#define REG_0A 0x0a
#define REG_0B 0x0b
#define REG_0C 0x0c
#define REG_37 0x37
#define REG_STRENGTH 0x4b
#define REG_STRENGTH_MASK 0x7f
#define REG_STRENGTH_CARRIER 0x80
#define REG_INVERSION 0x7c
#define REG_INVERSION_ON 0x80
#define REG_7D 0x7d
#define REG_7E 0x7e
#define REG_A2 0xa2
#define REG_STATUS 0xa4
#define REG_STATUS_SYNC 0x04
#define REG_STATUS_LOCK 0x01
struct lgs8gl5_state {
struct i2c_adapter *i2c;
const struct lgs8gl5_config *config;
struct dvb_frontend frontend;
};
static int debug;
#define dprintk(args...) \
do { \
if (debug) \
printk(KERN_DEBUG "lgs8gl5: " args); \
} while (0)
/* Writes into demod's register */
static int
lgs8gl5_write_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
{
int ret;
u8 buf[] = {reg, data};
struct i2c_msg msg = {
.addr = state->config->demod_address,
.flags = 0,
.buf = buf,
.len = 2
};
ret = i2c_transfer(state->i2c, &msg, 1);
if (ret != 1)
dprintk("%s: error (reg=0x%02x, val=0x%02x, ret=%i)\n",
__func__, reg, data, ret);
return (ret != 1) ? -1 : 0;
}
/* Reads from demod's register */
static int
lgs8gl5_read_reg(struct lgs8gl5_state *state, u8 reg)
{
int ret;
u8 b0[] = {reg};
u8 b1[] = {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)
return -EIO;
return b1[0];
}
static int
lgs8gl5_update_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
{
lgs8gl5_read_reg(state, reg);
lgs8gl5_write_reg(state, reg, data);
return 0;
}
/* Writes into alternate device's register */
/* TODO: Find out what that device is for! */
static int
lgs8gl5_update_alt_reg(struct lgs8gl5_state *state, u8 reg, u8 data)
{
int ret;
u8 b0[] = {reg};
u8 b1[] = {0};
u8 b2[] = {reg, data};
struct i2c_msg msg[3] = {
{
.addr = state->config->demod_address + 2,
.flags = 0,
.buf = b0,
.len = 1
},
{
.addr = state->config->demod_address + 2,
.flags = I2C_M_RD,
.buf = b1,
.len = 1
},
{
.addr = state->config->demod_address + 2,
.flags = 0,
.buf = b2,
.len = 2
},
};
ret = i2c_transfer(state->i2c, msg, 3);
return (ret != 3) ? -1 : 0;
}
static void
lgs8gl5_soft_reset(struct lgs8gl5_state *state)
{
u8 val;
dprintk("%s\n", __func__);
val = lgs8gl5_read_reg(state, REG_RESET);
lgs8gl5_write_reg(state, REG_RESET, val & ~REG_RESET_OFF);
lgs8gl5_write_reg(state, REG_RESET, val | REG_RESET_OFF);
msleep(5);
}
/* Starts demodulation */
static void
lgs8gl5_start_demod(struct lgs8gl5_state *state)
{
u8 val;
int n;
dprintk("%s\n", __func__);
lgs8gl5_update_alt_reg(state, 0xc2, 0x28);
lgs8gl5_soft_reset(state);
lgs8gl5_update_reg(state, REG_07, 0x10);
lgs8gl5_update_reg(state, REG_07, 0x10);
lgs8gl5_write_reg(state, REG_09, 0x0e);
lgs8gl5_write_reg(state, REG_0A, 0xe5);
lgs8gl5_write_reg(state, REG_0B, 0x35);
lgs8gl5_write_reg(state, REG_0C, 0x30);
lgs8gl5_update_reg(state, REG_03, 0x00);
lgs8gl5_update_reg(state, REG_7E, 0x01);
lgs8gl5_update_alt_reg(state, 0xc5, 0x00);
lgs8gl5_update_reg(state, REG_04, 0x02);
lgs8gl5_update_reg(state, REG_37, 0x01);
lgs8gl5_soft_reset(state);
/* Wait for carrier */
for (n = 0; n < 10; n++) {
val = lgs8gl5_read_reg(state, REG_STRENGTH);
dprintk("Wait for carrier[%d] 0x%02X\n", n, val);
if (val & REG_STRENGTH_CARRIER)
break;
msleep(4);
}
if (!(val & REG_STRENGTH_CARRIER))
return;
/* Wait for lock */
for (n = 0; n < 20; n++) {
val = lgs8gl5_read_reg(state, REG_STATUS);
dprintk("Wait for lock[%d] 0x%02X\n", n, val);
if (val & REG_STATUS_LOCK)
break;
msleep(12);
}
if (!(val & REG_STATUS_LOCK))
return;
lgs8gl5_write_reg(state, REG_7D, lgs8gl5_read_reg(state, REG_A2));
lgs8gl5_soft_reset(state);
}
static int
lgs8gl5_init(struct dvb_frontend *fe)
{
struct lgs8gl5_state *state = fe->demodulator_priv;
dprintk("%s\n", __func__);
lgs8gl5_update_alt_reg(state, 0xc2, 0x28);
lgs8gl5_soft_reset(state);
lgs8gl5_update_reg(state, REG_07, 0x10);
lgs8gl5_update_reg(state, REG_07, 0x10);
lgs8gl5_write_reg(state, REG_09, 0x0e);
lgs8gl5_write_reg(state, REG_0A, 0xe5);
lgs8gl5_write_reg(state, REG_0B, 0x35);
lgs8gl5_write_reg(state, REG_0C, 0x30);
return 0;
}
static int
lgs8gl5_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct lgs8gl5_state *state = fe->demodulator_priv;
u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
u8 flags = lgs8gl5_read_reg(state, REG_STATUS);
*status = 0;
if ((level & REG_STRENGTH_MASK) > 0)
*status |= FE_HAS_SIGNAL;
if (level & REG_STRENGTH_CARRIER)
*status |= FE_HAS_CARRIER;
if (flags & REG_STATUS_SYNC)
*status |= FE_HAS_SYNC;
if (flags & REG_STATUS_LOCK)
*status |= FE_HAS_LOCK;
return 0;
}
static int
lgs8gl5_read_ber(struct dvb_frontend *fe, u32 *ber)
{
*ber = 0;
return 0;
}
static int
lgs8gl5_read_signal_strength(struct dvb_frontend *fe, u16 *signal_strength)
{
struct lgs8gl5_state *state = fe->demodulator_priv;
u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
*signal_strength = (level & REG_STRENGTH_MASK) << 8;
return 0;
}
static int
lgs8gl5_read_snr(struct dvb_frontend *fe, u16 *snr)
{
struct lgs8gl5_state *state = fe->demodulator_priv;
u8 level = lgs8gl5_read_reg(state, REG_STRENGTH);
*snr = (level & REG_STRENGTH_MASK) << 8;
return 0;
}
static int
lgs8gl5_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
*ucblocks = 0;
return 0;
}
static int
lgs8gl5_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct lgs8gl5_state *state = fe->demodulator_priv;
dprintk("%s\n", __func__);
if (p->bandwidth_hz != 8000000)
return -EINVAL;
if (fe->ops.tuner_ops.set_params) {
fe->ops.tuner_ops.set_params(fe);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
}
/* lgs8gl5_set_inversion(state, p->inversion); */
lgs8gl5_start_demod(state);
return 0;
}
static int
lgs8gl5_get_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct lgs8gl5_state *state = fe->demodulator_priv;
u8 inv = lgs8gl5_read_reg(state, REG_INVERSION);
p->inversion = (inv & REG_INVERSION_ON) ? INVERSION_ON : INVERSION_OFF;
p->code_rate_HP = FEC_1_2;
p->code_rate_LP = FEC_7_8;
p->guard_interval = GUARD_INTERVAL_1_32;
p->transmission_mode = TRANSMISSION_MODE_2K;
p->modulation = QAM_64;
p->hierarchy = HIERARCHY_NONE;
p->bandwidth_hz = 8000000;
return 0;
}
static int
lgs8gl5_get_tune_settings(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings *fesettings)
{
fesettings->min_delay_ms = 240;
fesettings->step_size = 0;
fesettings->max_drift = 0;
return 0;
}
static void
lgs8gl5_release(struct dvb_frontend *fe)
{
struct lgs8gl5_state *state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops lgs8gl5_ops;
struct dvb_frontend*
lgs8gl5_attach(const struct lgs8gl5_config *config, struct i2c_adapter *i2c)
{
struct lgs8gl5_state *state = NULL;
dprintk("%s\n", __func__);
/* Allocate memory for the internal state */
state = kzalloc(sizeof(struct lgs8gl5_state), GFP_KERNEL);
if (state == NULL)
goto error;
/* Setup the state */
state->config = config;
state->i2c = i2c;
/* Check if the demod is there */
if (lgs8gl5_read_reg(state, REG_RESET) < 0)
goto error;
/* Create dvb_frontend */
memcpy(&state->frontend.ops, &lgs8gl5_ops,
sizeof(struct dvb_frontend_ops));
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
kfree(state);
return NULL;
}
EXPORT_SYMBOL(lgs8gl5_attach);
static struct dvb_frontend_ops lgs8gl5_ops = {
.delsys = { SYS_DMBTH },
.info = {
.name = "Legend Silicon LGS-8GL5 DMB-TH",
.frequency_min = 474000000,
.frequency_max = 858000000,
.frequency_stepsize = 10000,
.frequency_tolerance = 0,
.caps = FE_CAN_FEC_AUTO |
FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_32 |
FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
FE_CAN_TRANSMISSION_MODE_AUTO |
FE_CAN_BANDWIDTH_AUTO |
FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_HIERARCHY_AUTO |
FE_CAN_RECOVER
},
.release = lgs8gl5_release,
.init = lgs8gl5_init,
.set_frontend = lgs8gl5_set_frontend,
.get_frontend = lgs8gl5_get_frontend,
.get_tune_settings = lgs8gl5_get_tune_settings,
.read_status = lgs8gl5_read_status,
.read_ber = lgs8gl5_read_ber,
.read_signal_strength = lgs8gl5_read_signal_strength,
.read_snr = lgs8gl5_read_snr,
.read_ucblocks = lgs8gl5_read_ucblocks,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("Legend Silicon LGS-8GL5 DMB-TH Demodulator driver");
MODULE_AUTHOR("Timothy Lee");
MODULE_LICENSE("GPL");