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linux-next/drivers/media/tuners/tda18218.c
Paul Bolle ed2e330114 [media] tda18212: tda18218: use 'val' if initialized 
Commits e666a44fa3 ("[media] tda18212:
silence compiler warning") and e0e52d4e9f
("[media] tda18218: silence compiler warning") silenced warnings
equivalent to these:
    drivers/media/tuners/tda18212.c: In function ‘tda18212_attach’:
    drivers/media/tuners/tda18212.c:299:2: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    drivers/media/tuners/tda18218.c: In function ‘tda18218_attach’:
    drivers/media/tuners/tda18218.c:305:2: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized]
But in both cases 'val' will still be used uninitialized if the calls
of tda18212_rd_reg() or tda18218_rd_reg() fail. Fix this by only
printing the "chip id" if the calls of those functions were successful.
This allows to drop the uninitialized_var() stopgap measure.
Also stop printing the return values of tda18212_rd_reg() or
tda18218_rd_reg(), as these are not interesting.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Antti Palosaari <crope@iki.fi>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-12-21 18:25:13 -02:00

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/*
* NXP TDA18218HN silicon tuner driver
*
* Copyright (C) 2010 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "tda18218_priv.h"
/* write multiple registers */
static int tda18218_wr_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
{
int ret = 0, len2, remaining;
u8 buf[1 + len];
struct i2c_msg msg[1] = {
{
.addr = priv->cfg->i2c_address,
.flags = 0,
.buf = buf,
}
};
for (remaining = len; remaining > 0;
remaining -= (priv->cfg->i2c_wr_max - 1)) {
len2 = remaining;
if (len2 > (priv->cfg->i2c_wr_max - 1))
len2 = (priv->cfg->i2c_wr_max - 1);
msg[0].len = 1 + len2;
buf[0] = reg + len - remaining;
memcpy(&buf[1], &val[len - remaining], len2);
ret = i2c_transfer(priv->i2c, msg, 1);
if (ret != 1)
break;
}
if (ret == 1) {
ret = 0;
} else {
dev_warn(&priv->i2c->dev, "%s: i2c wr failed=%d reg=%02x " \
"len=%d\n", KBUILD_MODNAME, ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* read multiple registers */
static int tda18218_rd_regs(struct tda18218_priv *priv, u8 reg, u8 *val, u8 len)
{
int ret;
u8 buf[reg+len]; /* we must start read always from reg 0x00 */
struct i2c_msg msg[2] = {
{
.addr = priv->cfg->i2c_address,
.flags = 0,
.len = 1,
.buf = "\x00",
}, {
.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[reg], len);
ret = 0;
} else {
dev_warn(&priv->i2c->dev, "%s: i2c rd failed=%d reg=%02x " \
"len=%d\n", KBUILD_MODNAME, ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* write single register */
static int tda18218_wr_reg(struct tda18218_priv *priv, u8 reg, u8 val)
{
return tda18218_wr_regs(priv, reg, &val, 1);
}
/* read single register */
static int tda18218_rd_reg(struct tda18218_priv *priv, u8 reg, u8 *val)
{
return tda18218_rd_regs(priv, reg, val, 1);
}
static int tda18218_set_params(struct dvb_frontend *fe)
{
struct tda18218_priv *priv = fe->tuner_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u32 bw = c->bandwidth_hz;
int ret;
u8 buf[3], i, BP_Filter, LP_Fc;
u32 LO_Frac;
/* TODO: find out correct AGC algorithm */
u8 agc[][2] = {
{ R20_AGC11, 0x60 },
{ R23_AGC21, 0x02 },
{ R20_AGC11, 0xa0 },
{ R23_AGC21, 0x09 },
{ R20_AGC11, 0xe0 },
{ R23_AGC21, 0x0c },
{ R20_AGC11, 0x40 },
{ R23_AGC21, 0x01 },
{ R20_AGC11, 0x80 },
{ R23_AGC21, 0x08 },
{ R20_AGC11, 0xc0 },
{ R23_AGC21, 0x0b },
{ R24_AGC22, 0x1c },
{ R24_AGC22, 0x0c },
};
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
/* low-pass filter cut-off frequency */
if (bw <= 6000000) {
LP_Fc = 0;
priv->if_frequency = 3000000;
} else if (bw <= 7000000) {
LP_Fc = 1;
priv->if_frequency = 3500000;
} else {
LP_Fc = 2;
priv->if_frequency = 4000000;
}
LO_Frac = c->frequency + priv->if_frequency;
/* band-pass filter */
if (LO_Frac < 188000000)
BP_Filter = 3;
else if (LO_Frac < 253000000)
BP_Filter = 4;
else if (LO_Frac < 343000000)
BP_Filter = 5;
else
BP_Filter = 6;
buf[0] = (priv->regs[R1A_IF1] & ~7) | BP_Filter; /* BP_Filter */
buf[1] = (priv->regs[R1B_IF2] & ~3) | LP_Fc; /* LP_Fc */
buf[2] = priv->regs[R1C_AGC2B];
ret = tda18218_wr_regs(priv, R1A_IF1, buf, 3);
if (ret)
goto error;
buf[0] = (LO_Frac / 1000) >> 12; /* LO_Frac_0 */
buf[1] = (LO_Frac / 1000) >> 4; /* LO_Frac_1 */
buf[2] = (LO_Frac / 1000) << 4 |
(priv->regs[R0C_MD5] & 0x0f); /* LO_Frac_2 */
ret = tda18218_wr_regs(priv, R0A_MD3, buf, 3);
if (ret)
goto error;
buf[0] = priv->regs[R0F_MD8] | (1 << 6); /* Freq_prog_Start */
ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
if (ret)
goto error;
buf[0] = priv->regs[R0F_MD8] & ~(1 << 6); /* Freq_prog_Start */
ret = tda18218_wr_regs(priv, R0F_MD8, buf, 1);
if (ret)
goto error;
/* trigger AGC */
for (i = 0; i < ARRAY_SIZE(agc); i++) {
ret = tda18218_wr_reg(priv, agc[i][0], agc[i][1]);
if (ret)
goto error;
}
error:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (ret)
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static int tda18218_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
struct tda18218_priv *priv = fe->tuner_priv;
*frequency = priv->if_frequency;
dev_dbg(&priv->i2c->dev, "%s: if_frequency=%d\n", __func__, *frequency);
return 0;
}
static int tda18218_sleep(struct dvb_frontend *fe)
{
struct tda18218_priv *priv = fe->tuner_priv;
int ret;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
/* standby */
ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (ret)
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static int tda18218_init(struct dvb_frontend *fe)
{
struct tda18218_priv *priv = fe->tuner_priv;
int ret;
/* TODO: calibrations */
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
ret = tda18218_wr_regs(priv, R00_ID, priv->regs, TDA18218_NUM_REGS);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
if (ret)
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static int tda18218_release(struct dvb_frontend *fe)
{
kfree(fe->tuner_priv);
fe->tuner_priv = NULL;
return 0;
}
static const struct dvb_tuner_ops tda18218_tuner_ops = {
.info = {
.name = "NXP TDA18218",
.frequency_min = 174000000,
.frequency_max = 864000000,
.frequency_step = 1000,
},
.release = tda18218_release,
.init = tda18218_init,
.sleep = tda18218_sleep,
.set_params = tda18218_set_params,
.get_if_frequency = tda18218_get_if_frequency,
};
struct dvb_frontend *tda18218_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, struct tda18218_config *cfg)
{
struct tda18218_priv *priv = NULL;
u8 val;
int ret;
/* chip default registers values */
static u8 def_regs[] = {
0xc0, 0x88, 0x00, 0x8e, 0x03, 0x00, 0x00, 0xd0, 0x00, 0x40,
0x00, 0x00, 0x07, 0xff, 0x84, 0x09, 0x00, 0x13, 0x00, 0x00,
0x01, 0x84, 0x09, 0xf0, 0x19, 0x0a, 0x8e, 0x69, 0x98, 0x01,
0x00, 0x58, 0x10, 0x40, 0x8c, 0x00, 0x0c, 0x48, 0x85, 0xc9,
0xa7, 0x00, 0x00, 0x00, 0x30, 0x81, 0x80, 0x00, 0x39, 0x00,
0x8a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf6, 0xf6
};
priv = kzalloc(sizeof(struct tda18218_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 = tda18218_rd_reg(priv, R00_ID, &val);
if (!ret)
dev_dbg(&priv->i2c->dev, "%s: chip id=%02x\n", __func__, val);
if (ret || val != def_regs[R00_ID]) {
kfree(priv);
return NULL;
}
dev_info(&priv->i2c->dev,
"%s: NXP TDA18218HN successfully identified\n",
KBUILD_MODNAME);
memcpy(&fe->ops.tuner_ops, &tda18218_tuner_ops,
sizeof(struct dvb_tuner_ops));
memcpy(priv->regs, def_regs, sizeof(def_regs));
/* loop-through enabled chip default register values */
if (priv->cfg->loop_through) {
priv->regs[R17_PD1] = 0xb0;
priv->regs[R18_PD2] = 0x59;
}
/* standby */
ret = tda18218_wr_reg(priv, R17_PD1, priv->regs[R17_PD1] | (1 << 0));
if (ret)
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
return fe;
}
EXPORT_SYMBOL(tda18218_attach);
MODULE_DESCRIPTION("NXP TDA18218HN silicon tuner driver");
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_LICENSE("GPL");
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