redonkable/alistair23-linux
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V4L/DVB (6821): s5h1409: fix IF frequency configuration

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On the s5h1409 demod, the IF frequency for VSB is limited to 44 / 5.38 MHz.

Hardcode VSB IF frequency within the driver to 44 / 5.38 MHz.
QAM IF frequency remains configurable via attach-time configuration.

Acked-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2007-12-13 10:04:10 -03:00 committed by Mauro Carvalho Chehab
parent 18ff605a18
commit 2b03238a79
3 changed files with 17 additions and 5 deletions
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14
drivers/media/dvb/frontends/s5h1409.c
View file

@ -42,6 +42,7 @@ struct s5h1409_state {
fe_modulation_t current_modulation;
u32 current_frequency;
int if_freq;
u32 is_qam_locked;
u32 qam_state;
@ -348,6 +349,9 @@ static int s5h1409_softreset(struct dvb_frontend* fe)
return 0;
}
#define S5H1409_VSB_IF_FREQ 5380
#define S5H1409_QAM_IF_FREQ state->config->qam_if
static int s5h1409_set_if_freq(struct dvb_frontend* fe, int KHz)
{
struct s5h1409_state* state = fe->demodulator_priv;
@ -369,6 +373,9 @@ static int s5h1409_set_if_freq(struct dvb_frontend* fe, int KHz)
ret = -1;
}
if (0 == ret)
state->if_freq = KHz;
return ret;
}
@ -394,11 +401,15 @@ static int s5h1409_enable_modulation(struct dvb_frontend* fe,
switch(m) {
case VSB_8:
dprintk("%s() VSB_8\n", __FUNCTION__);
if (state->if_freq != S5H1409_VSB_IF_FREQ)
s5h1409_set_if_freq(fe, S5H1409_VSB_IF_FREQ);
s5h1409_writereg(state, 0xf4, 0);
break;
case QAM_64:
case QAM_256:
dprintk("%s() QAM_AUTO (64/256)\n", __FUNCTION__);
if (state->if_freq != S5H1409_QAM_IF_FREQ)
s5h1409_set_if_freq(fe, S5H1409_QAM_IF_FREQ);
s5h1409_writereg(state, 0xf4, 1);
s5h1409_writereg(state, 0x85, 0x110);
break;
@ -571,7 +582,7 @@ static int s5h1409_init (struct dvb_frontend* fe)
s5h1409_writereg(state, 0xab, 0x0); /* Parallel */
s5h1409_set_spectralinversion(fe, state->config->inversion);
s5h1409_set_if_freq(fe, state->config->if_freq);
s5h1409_set_if_freq(fe, state->if_freq);
s5h1409_set_gpio(fe, state->config->gpio);
s5h1409_softreset(fe);
@ -751,6 +762,7 @@ struct dvb_frontend* s5h1409_attach(const struct s5h1409_config* config,
state->config = config;
state->i2c = i2c;
state->current_modulation = 0;
state->if_freq = S5H1409_VSB_IF_FREQ;
/* check if the demod exists */
if (s5h1409_readreg(state, 0x04) != 0x0066)

4
drivers/media/dvb/frontends/s5h1409.h
View file

@ -39,8 +39,8 @@ struct s5h1409_config
#define S5H1409_GPIO_ON 1
u8 gpio;
/* IF Freq in KHz */
u16 if_freq;
/* IF Freq for QAM in KHz, VSB is hardcoded to 5380 */
u16 qam_if;
/* Spectral Inversion */
#define S5H1409_INVERSION_OFF 0

4
drivers/media/video/cx23885/cx23885-dvb.c
View file

@ -85,7 +85,7 @@ static struct s5h1409_config hauppauge_generic_config = {
.demod_address = 0x32 >> 1,
.output_mode = S5H1409_SERIAL_OUTPUT,
.gpio = S5H1409_GPIO_ON,
.if_freq = 44000,
.qam_if = 44000,
.inversion = S5H1409_INVERSION_OFF,
.status_mode = S5H1409_DEMODLOCKING
};
@ -94,7 +94,7 @@ static struct s5h1409_config hauppauge_hvr1800lp_config = {
.demod_address = 0x32 >> 1,
.output_mode = S5H1409_SERIAL_OUTPUT,
.gpio = S5H1409_GPIO_OFF,
.if_freq = 44000,
.qam_if = 44000,
.inversion = S5H1409_INVERSION_OFF,
.status_mode = S5H1409_DEMODLOCKING
};