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V4L/DVB (7383): tda18271: add attach-time parameter to limit i2c transfer size

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Add attach-time parameter, "small_i2c" to limit i2c transfer size to write
at most 16 registers at a time during initialization.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2008-04-22 14:46:06 -03:00 committed by Mauro Carvalho Chehab
parent ab8b870e43
commit 5555309c9a
4 changed files with 13 additions and 1 deletions
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7
drivers/media/dvb/frontends/tda18271-common.c
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@ -311,7 +311,12 @@ int tda18271_init_regs(struct dvb_frontend *fe)
regs[R_EB22] = 0x48;
regs[R_EB23] = 0xb0;
tda18271_write_regs(fe, 0x00, TDA18271_NUM_REGS);
if (priv->small_i2c) {
tda18271_write_regs(fe, 0x00, 0x10);
tda18271_write_regs(fe, 0x10, 0x10);
tda18271_write_regs(fe, 0x20, 0x07);
} else
tda18271_write_regs(fe, 0x00, TDA18271_NUM_REGS);
/* setup agc1 gain */
regs[R_EB17] = 0x00;

3
drivers/media/dvb/frontends/tda18271-fe.c
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@ -1081,6 +1081,9 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
fe->tuner_priv = priv;
if (cfg)
priv->small_i2c = cfg->small_i2c;
if (tda18271_get_id(fe) < 0)
goto fail;

1
drivers/media/dvb/frontends/tda18271-priv.h
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@ -110,6 +110,7 @@ struct tda18271_priv {
unsigned int tm_rfcal;
unsigned int cal_initialized:1;
unsigned int small_i2c:1;
struct tda18271_map_layout *maps;
struct tda18271_std_map std;

3
drivers/media/dvb/frontends/tda18271.h
View File

@ -58,6 +58,9 @@ struct tda18271_config {
/* use i2c gate provided by analog or digital demod */
enum tda18271_i2c_gate gate;
/* some i2c providers cant write all 39 registers at once */
unsigned int small_i2c:1;
};
#if defined(CONFIG_DVB_TDA18271) || (defined(CONFIG_DVB_TDA18271_MODULE) && defined(MODULE))