- 根目录:
- drivers
- media
- common
- tuners
- tda18212.c
/*
* NXP TDA18212HN silicon tuner driver
*
* Copyright (C) 2011 Antti Palosaari <crope@iki.fi>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include "tda18212.h"
struct tda18212_priv {
struct tda18212_config *cfg;
struct i2c_adapter *i2c;
u32 if_frequency;
};
#define dbg(fmt, arg...) \
do { \
if (debug) \
pr_info("%s: " fmt, __func__, ##arg); \
} while (0)
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
/* write multiple registers */
static int tda18212_wr_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
int len)
{
int ret;
u8 buf[len+1];
struct i2c_msg msg[1] = {
{
.addr = priv->cfg->i2c_address,
.flags = 0,
.len = sizeof(buf),
.buf = buf,
}
};
buf[0] = reg;
memcpy(&buf[1], val, len);
ret = i2c_transfer(priv->i2c, msg, 1);
if (ret == 1) {
ret = 0;
} else {
pr_warn("i2c wr failed ret:%d reg:%02x len:%d\n",
ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* read multiple registers */
static int tda18212_rd_regs(struct tda18212_priv *priv, u8 reg, u8 *val,
int len)
{
int ret;
u8 buf[len];
struct i2c_msg msg[2] = {
{
.addr = priv->cfg->i2c_address,
.flags = 0,
.len = 1,
.buf = ®,
}, {
.addr = priv->cfg->i2c_address,
.flags = I2C_M_RD,
.len = sizeof(buf),
.buf = buf,
}
};
ret = i2c_transfer(priv->i2c, msg, 2);
if (ret == 2) {
memcpy(val, buf, len);
ret = 0;
} else {
pr_warn("i2c rd failed ret:%d reg:%02x len:%d\n",
ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* write single register */
static int tda18212_wr_reg(struct tda18212_priv *priv, u8 reg, u8 val)
{
return tda18212_wr_regs(priv, reg, &val, 1);
}
/* read single register */
static int tda18212_rd_reg(struct tda18212_priv *priv, u8 reg, u8 *val)
{
return tda18212_rd_regs(priv, reg, val, 1);
}
#if 0 /* keep, useful when developing driver */
static void tda18212_dump_regs(struct tda18212_priv *priv)
{
int i;
u8 buf[256];
#define TDA18212_RD_LEN 32
for (i = 0; i < sizeof(buf); i += TDA18212_RD_LEN)
tda18212_rd_regs(priv, i, &buf[i], TDA18212_RD_LEN);
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET, 32, 1, buf,
sizeof(buf), true);
return;
}
#endif
static int tda18212_set_params(struct dvb_frontend *fe)
{
struct tda18212_priv *priv = fe->tuner_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, i;
u32 if_khz;
u8 buf[9];
#define DVBT_6 0
#define DVBT_7 1
#define DVBT_8 2
#define DVBT2_6 3
#define DVBT2_7 4
#define DVBT2_8 5
#define DVBC_6 6
#define DVBC_8 7
static const u8 bw_params[][3] = {
/* reg: 0f 13 23 */
[DVBT_6] = { 0xb3, 0x20, 0x03 },
[DVBT_7] = { 0xb3, 0x31, 0x01 },
[DVBT_8] = { 0xb3, 0x22, 0x01 },
[DVBT2_6] = { 0xbc, 0x20, 0x03 },
[DVBT2_7] = { 0xbc, 0x72, 0x03 },
[DVBT2_8] = { 0xbc, 0x22, 0x01 },
[DVBC_6] = { 0x92, 0x50, 0x03 },
[DVBC_8] = { 0x92, 0x53, 0x03 },
};
dbg("delsys=%d RF=%d BW=%d\n",
c->delivery_system, c->frequency, c->bandwidth_hz);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
switch (c->delivery_system) {
case SYS_DVBT:
switch (c->bandwidth_hz) {
case 6000000:
if_khz = priv->cfg->if_dvbt_6;
i = DVBT_6;
break;
case 7000000:
if_khz = priv->cfg->if_dvbt_7;
i = DVBT_7;
break;
case 8000000:
if_khz = priv->cfg->if_dvbt_8;
i = DVBT_8;
break;
default:
ret = -EINVAL;
goto error;
}
break;
case SYS_DVBT2:
switch (c->bandwidth_hz) {
case 6000000:
if_khz = priv->cfg->if_dvbt2_6;
i = DVBT2_6;
break;
case 7000000:
if_khz = priv->cfg->if_dvbt2_7;
i = DVBT2_7;
break;
case 8000000:
if_khz = priv->cfg->if_dvbt2_8;
i = DVBT2_8;
break;
default:
ret = -EINVAL;
goto error;
}
break;
case SYS_DVBC_ANNEX_A:
case SYS_DVBC_ANNEX_C:
if_khz = priv->cfg->if_dvbc;
i = DVBC_8;
break;
default:
ret = -EINVAL;
goto error;
}
ret = tda18212_wr_reg(priv, 0x23, bw_params[i][2]);
if (ret)
goto error;
ret = tda18212_wr_reg(priv, 0x06, 0x00);
if (ret)
goto error;
ret = tda18212_wr_reg(priv, 0x0f, bw_params[i][0]);
if (ret)
goto error;
buf[0] = 0x02;
buf[1] = bw_params[i][1];
buf[2] = 0x03; /* default value */
buf[3] = DIV_ROUND_CLOSEST(if_khz, 50);
buf[4] = ((c->frequency / 1000) >> 16) & 0xff;
buf[5] = ((c->frequency / 1000) >> 8) & 0xff;
buf[6] = ((c->frequency / 1000) >> 0) & 0xff;
buf[7] = 0xc1;
buf[8] = 0x01;
ret = tda18212_wr_regs(priv, 0x12, buf, sizeof(buf));
if (ret)
goto error;
/* actual IF rounded as it is on register */
priv->if_frequency = buf[3] * 50 * 1000;
exit:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
return ret;
error:
dbg("failed:%d\n", ret);
goto exit;
}
static int tda18212_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct tda18212_priv *priv = fe->tuner_priv;
*frequency = priv->if_frequency;
return 0;
}
static int tda18212_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static const struct dvb_tuner_ops tda18212_tuner_ops = {
.info = {
.name = "NXP TDA18212",
.frequency_min = 48000000,
.frequency_max = 864000000,
.frequency_step = 1000,
},
.release = tda18212_release,
.set_params = tda18212_set_params,
.get_if_frequency = tda18212_get_if_frequency,
};
struct dvb_frontend *tda18212_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, struct tda18212_config *cfg)
{
struct tda18212_priv *priv = NULL;
int ret;
u8 val;
priv = kzalloc(sizeof(struct tda18212_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
priv->cfg = cfg;
priv->i2c = i2c;
fe->tuner_priv = priv;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
/* check if the tuner is there */
ret = tda18212_rd_reg(priv, 0x00, &val);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
dbg("ret:%d chip ID:%02x\n", ret, val);
if (ret || val != 0xc7) {
kfree(priv);
return NULL;
}
pr_info("NXP TDA18212HN successfully identified\n");
memcpy(&fe->ops.tuner_ops, &tda18212_tuner_ops,
sizeof(struct dvb_tuner_ops));
return fe;
}
EXPORT_SYMBOL(tda18212_attach);
MODULE_DESCRIPTION("NXP TDA18212HN silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");