- 根目录:
- drivers
- media
- usb
- dvb-usb
- friio-fe.c
/* DVB USB compliant Linux driver for the Friio USB2.0 ISDB-T receiver.
*
* Copyright (C) 2009 Akihiro Tsukada <tskd2@yahoo.co.jp>
*
* This module is based off the the gl861 and vp702x modules.
*
* 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, version 2.
*
* see Documentation/dvb/README.dvb-usb for more information
*/
#include <linux/init.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "friio.h"
struct jdvbt90502_state {
struct i2c_adapter *i2c;
struct dvb_frontend frontend;
struct jdvbt90502_config config;
};
/* NOTE: TC90502 has 16bit register-address? */
/* register 0x0100 is used for reading PLL status, so reg is u16 here */
static int jdvbt90502_reg_read(struct jdvbt90502_state *state,
const u16 reg, u8 *buf, const size_t count)
{
int ret;
u8 wbuf[3];
struct i2c_msg msg[2];
wbuf[0] = reg & 0xFF;
wbuf[1] = 0;
wbuf[2] = reg >> 8;
msg[0].addr = state->config.demod_address;
msg[0].flags = 0;
msg[0].buf = wbuf;
msg[0].len = sizeof(wbuf);
msg[1].addr = msg[0].addr;
msg[1].flags = I2C_M_RD;
msg[1].buf = buf;
msg[1].len = count;
ret = i2c_transfer(state->i2c, msg, 2);
if (ret != 2) {
deb_fe(" reg read failed.\n");
return -EREMOTEIO;
}
return 0;
}
/* currently 16bit register-address is not used, so reg is u8 here */
static int jdvbt90502_single_reg_write(struct jdvbt90502_state *state,
const u8 reg, const u8 val)
{
struct i2c_msg msg;
u8 wbuf[2];
wbuf[0] = reg;
wbuf[1] = val;
msg.addr = state->config.demod_address;
msg.flags = 0;
msg.buf = wbuf;
msg.len = sizeof(wbuf);
if (i2c_transfer(state->i2c, &msg, 1) != 1) {
deb_fe(" reg write failed.");
return -EREMOTEIO;
}
return 0;
}
static int _jdvbt90502_write(struct dvb_frontend *fe, const u8 buf[], int len)
{
struct jdvbt90502_state *state = fe->demodulator_priv;
int err, i;
for (i = 0; i < len - 1; i++) {
err = jdvbt90502_single_reg_write(state,
buf[0] + i, buf[i + 1]);
if (err)
return err;
}
return 0;
}
/* read pll status byte via the demodulator's I2C register */
/* note: Win box reads it by 8B block at the I2C addr 0x30 from reg:0x80 */
static int jdvbt90502_pll_read(struct jdvbt90502_state *state, u8 *result)
{
int ret;
/* +1 for reading */
u8 pll_addr_byte = (state->config.pll_address << 1) + 1;
*result = 0;
ret = jdvbt90502_single_reg_write(state, JDVBT90502_2ND_I2C_REG,
pll_addr_byte);
if (ret)
goto error;
ret = jdvbt90502_reg_read(state, 0x0100, result, 1);
if (ret)
goto error;
deb_fe("PLL read val:%02x\n", *result);
return 0;
error:
deb_fe("%s:ret == %d\n", __func__, ret);
return -EREMOTEIO;
}
/* set pll frequency via the demodulator's I2C register */
static int jdvbt90502_pll_set_freq(struct jdvbt90502_state *state, u32 freq)
{
int ret;
int retry;
u8 res1;
u8 res2[9];
u8 pll_freq_cmd[PLL_CMD_LEN];
u8 pll_agc_cmd[PLL_CMD_LEN];
struct i2c_msg msg[2];
u32 f;
deb_fe("%s: freq=%d, step=%d\n", __func__, freq,
state->frontend.ops.info.frequency_stepsize);
/* freq -> oscilator frequency conversion. */
/* freq: 473,000,000 + n*6,000,000 [+ 142857 (center freq. shift)] */
f = freq / state->frontend.ops.info.frequency_stepsize;
/* add 399[1/7 MHZ] = 57MHz for the IF */
f += 399;
/* add center frequency shift if necessary */
if (f % 7 == 0)
f++;
pll_freq_cmd[DEMOD_REDIRECT_REG] = JDVBT90502_2ND_I2C_REG; /* 0xFE */
pll_freq_cmd[ADDRESS_BYTE] = state->config.pll_address << 1;
pll_freq_cmd[DIVIDER_BYTE1] = (f >> 8) & 0x7F;
pll_freq_cmd[DIVIDER_BYTE2] = f & 0xFF;
pll_freq_cmd[CONTROL_BYTE] = 0xB2; /* ref.divider:28, 4MHz/28=1/7MHz */
pll_freq_cmd[BANDSWITCH_BYTE] = 0x08; /* UHF band */
msg[0].addr = state->config.demod_address;
msg[0].flags = 0;
msg[0].buf = pll_freq_cmd;
msg[0].len = sizeof(pll_freq_cmd);
ret = i2c_transfer(state->i2c, &msg[0], 1);
if (ret != 1)
goto error;
udelay(50);
pll_agc_cmd[DEMOD_REDIRECT_REG] = pll_freq_cmd[DEMOD_REDIRECT_REG];
pll_agc_cmd[ADDRESS_BYTE] = pll_freq_cmd[ADDRESS_BYTE];
pll_agc_cmd[DIVIDER_BYTE1] = pll_freq_cmd[DIVIDER_BYTE1];
pll_agc_cmd[DIVIDER_BYTE2] = pll_freq_cmd[DIVIDER_BYTE2];
pll_agc_cmd[CONTROL_BYTE] = 0x9A; /* AGC_CTRL instead of BANDSWITCH */
pll_agc_cmd[AGC_CTRL_BYTE] = 0x50;
/* AGC Time Constant 2s, AGC take-over point:103dBuV(lowest) */
msg[1].addr = msg[0].addr;
msg[1].flags = 0;
msg[1].buf = pll_agc_cmd;
msg[1].len = sizeof(pll_agc_cmd);
ret = i2c_transfer(state->i2c, &msg[1], 1);
if (ret != 1)
goto error;
/* I don't know what these cmds are for, */
/* but the USB log on a windows box contains them */
ret = jdvbt90502_single_reg_write(state, 0x01, 0x40);
ret |= jdvbt90502_single_reg_write(state, 0x01, 0x00);
if (ret)
goto error;
udelay(100);
/* wait for the demod to be ready? */
#define RETRY_COUNT 5
for (retry = 0; retry < RETRY_COUNT; retry++) {
ret = jdvbt90502_reg_read(state, 0x0096, &res1, 1);
if (ret)
goto error;
/* if (res1 != 0x00) goto error; */
ret = jdvbt90502_reg_read(state, 0x00B0, res2, sizeof(res2));
if (ret)
goto error;
if (res2[0] >= 0xA7)
break;
msleep(100);
}
if (retry >= RETRY_COUNT) {
deb_fe("%s: FE does not get ready after freq setting.\n",
__func__);
return -EREMOTEIO;
}
return 0;
error:
deb_fe("%s:ret == %d\n", __func__, ret);
return -EREMOTEIO;
}
static int jdvbt90502_read_status(struct dvb_frontend *fe, fe_status_t *state)
{
u8 result;
int ret;
*state = FE_HAS_SIGNAL;
ret = jdvbt90502_pll_read(fe->demodulator_priv, &result);
if (ret) {
deb_fe("%s:ret == %d\n", __func__, ret);
return -EREMOTEIO;
}
*state = FE_HAS_SIGNAL
| FE_HAS_CARRIER
| FE_HAS_VITERBI
| FE_HAS_SYNC;
if (result & PLL_STATUS_LOCKED)
*state |= FE_HAS_LOCK;
return 0;
}
static int jdvbt90502_read_signal_strength(struct dvb_frontend *fe,
u16 *strength)
{
int ret;
u8 rbuf[37];
*strength = 0;
/* status register (incl. signal strength) : 0x89 */
/* TODO: read just the necessary registers [0x8B..0x8D]? */
ret = jdvbt90502_reg_read(fe->demodulator_priv, 0x0089,
rbuf, sizeof(rbuf));
if (ret) {
deb_fe("%s:ret == %d\n", __func__, ret);
return -EREMOTEIO;
}
/* signal_strength: rbuf[2-4] (24bit BE), use lower 16bit for now. */
*strength = (rbuf[3] << 8) + rbuf[4];
if (rbuf[2])
*strength = 0xffff;
return 0;
}
/* filter out un-supported properties to notify users */
static int jdvbt90502_set_property(struct dvb_frontend *fe,
struct dtv_property *tvp)
{
int r = 0;
switch (tvp->cmd) {
case DTV_DELIVERY_SYSTEM:
if (tvp->u.data != SYS_ISDBT)
r = -EINVAL;
break;
case DTV_CLEAR:
case DTV_TUNE:
case DTV_FREQUENCY:
break;
default:
r = -EINVAL;
}
return r;
}
static int jdvbt90502_get_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
p->inversion = INVERSION_AUTO;
p->bandwidth_hz = 6000000;
p->code_rate_HP = FEC_AUTO;
p->code_rate_LP = FEC_AUTO;
p->modulation = QAM_64;
p->transmission_mode = TRANSMISSION_MODE_AUTO;
p->guard_interval = GUARD_INTERVAL_AUTO;
p->hierarchy = HIERARCHY_AUTO;
return 0;
}
static int jdvbt90502_set_frontend(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
/**
* NOTE: ignore all the parameters except frequency.
* others should be fixed to the proper value for ISDB-T,
* but don't check here.
*/
struct jdvbt90502_state *state = fe->demodulator_priv;
int ret;
deb_fe("%s: Freq:%d\n", __func__, p->frequency);
/* for recovery from DTV_CLEAN */
fe->dtv_property_cache.delivery_system = SYS_ISDBT;
ret = jdvbt90502_pll_set_freq(state, p->frequency);
if (ret) {
deb_fe("%s:ret == %d\n", __func__, ret);
return -EREMOTEIO;
}
return 0;
}
/**
* (reg, val) commad list to initialize this module.
* captured on a Windows box.
*/
static u8 init_code[][2] = {
{0x01, 0x40},
{0x04, 0x38},
{0x05, 0x40},
{0x07, 0x40},
{0x0F, 0x4F},
{0x11, 0x21},
{0x12, 0x0B},
{0x13, 0x2F},
{0x14, 0x31},
{0x16, 0x02},
{0x21, 0xC4},
{0x22, 0x20},
{0x2C, 0x79},
{0x2D, 0x34},
{0x2F, 0x00},
{0x30, 0x28},
{0x31, 0x31},
{0x32, 0xDF},
{0x38, 0x01},
{0x39, 0x78},
{0x3B, 0x33},
{0x3C, 0x33},
{0x48, 0x90},
{0x51, 0x68},
{0x5E, 0x38},
{0x71, 0x00},
{0x72, 0x08},
{0x77, 0x00},
{0xC0, 0x21},
{0xC1, 0x10},
{0xE4, 0x1A},
{0xEA, 0x1F},
{0x77, 0x00},
{0x71, 0x00},
{0x71, 0x00},
{0x76, 0x0C},
};
static const int init_code_len = sizeof(init_code) / sizeof(u8[2]);
static int jdvbt90502_init(struct dvb_frontend *fe)
{
int i = -1;
int ret;
struct i2c_msg msg;
struct jdvbt90502_state *state = fe->demodulator_priv;
deb_fe("%s called.\n", __func__);
msg.addr = state->config.demod_address;
msg.flags = 0;
msg.len = 2;
for (i = 0; i < init_code_len; i++) {
msg.buf = init_code[i];
ret = i2c_transfer(state->i2c, &msg, 1);
if (ret != 1)
goto error;
}
fe->dtv_property_cache.delivery_system = SYS_ISDBT;
msleep(100);
return 0;
error:
deb_fe("%s: init_code[%d] failed. ret==%d\n", __func__, i, ret);
return -EREMOTEIO;
}
static void jdvbt90502_release(struct dvb_frontend *fe)
{
struct jdvbt90502_state *state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops jdvbt90502_ops;
struct dvb_frontend *jdvbt90502_attach(struct dvb_usb_device *d)
{
struct jdvbt90502_state *state = NULL;
deb_info("%s called.\n", __func__);
/* allocate memory for the internal state */
state = kzalloc(sizeof(struct jdvbt90502_state), GFP_KERNEL);
if (state == NULL)
goto error;
/* setup the state */
state->i2c = &d->i2c_adap;
state->config = friio_fe_config;
/* create dvb_frontend */
state->frontend.ops = jdvbt90502_ops;
state->frontend.demodulator_priv = state;
if (jdvbt90502_init(&state->frontend) < 0)
goto error;
return &state->frontend;
error:
kfree(state);
return NULL;
}
static struct dvb_frontend_ops jdvbt90502_ops = {
.delsys = { SYS_ISDBT },
.info = {
.name = "Comtech JDVBT90502 ISDB-T",
.frequency_min = 473000000, /* UHF 13ch, center */
.frequency_max = 767142857, /* UHF 62ch, center */
.frequency_stepsize = JDVBT90502_PLL_CLK / JDVBT90502_PLL_DIVIDER,
.frequency_tolerance = 0,
/* NOTE: this driver ignores all parameters but frequency. */
.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_64 | FE_CAN_QAM_AUTO |
FE_CAN_TRANSMISSION_MODE_AUTO |
FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_HIERARCHY_AUTO,
},
.release = jdvbt90502_release,
.init = jdvbt90502_init,
.write = _jdvbt90502_write,
.set_property = jdvbt90502_set_property,
.set_frontend = jdvbt90502_set_frontend,
.get_frontend = jdvbt90502_get_frontend,
.read_status = jdvbt90502_read_status,
.read_signal_strength = jdvbt90502_read_signal_strength,
};