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V4L/DVB (9311): s5h1411: bugfix: Setting serial or parallel mode could destroy bits

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Adding a serialmode function to read/and/or/write the register for safety.

Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Steven Toth 2008-10-16 23:18:49 -03:00 committed by Mauro Carvalho Chehab
parent e16c63de92
commit 1af46b450f
1 changed files with 16 additions and 2 deletions
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18
drivers/media/dvb/frontends/s5h1411.c
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@ -470,6 +470,20 @@ static int s5h1411_set_spectralinversion(struct dvb_frontend *fe, int inversion)
return s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0x24, val);
}
static int s5h1411_set_serialmode(struct dvb_frontend *fe, int serial)
{
struct s5h1411_state *state = fe->demodulator_priv;
u16 val;
dprintk("%s(%d)\n", __func__, serial);
val = s5h1411_readreg(state, S5H1411_I2C_TOP_ADDR, 0xbd) & ~0x100;
if (serial == 1)
val |= 0x100;
return s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, val);
}
static int s5h1411_enable_modulation(struct dvb_frontend *fe,
fe_modulation_t m)
{
@ -611,10 +625,10 @@ static int s5h1411_init(struct dvb_frontend *fe)
if (state->config->output_mode == S5H1411_SERIAL_OUTPUT)
/* Serial */
s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, 0x1101);
s5h1411_set_serialmode(fe, 1);
else
/* Parallel */
s5h1411_writereg(state, S5H1411_I2C_TOP_ADDR, 0xbd, 0x1001);
s5h1411_set_serialmode(fe, 0);
s5h1411_set_spectralinversion(fe, state->config->inversion);
s5h1411_set_if_freq(fe, state->config->vsb_if);