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add field and register reading/writing macros

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This commit is contained in:
Ralph Metzler 2017-10-25 23:13:26 +02:00
parent 021eae2eac
commit 9e5576c562
1 changed files with 28 additions and 0 deletions
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28
frontends/stv0910.c
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@ -189,6 +189,34 @@ static int write_shared_reg(struct stv *state, u16 reg, u8 mask, u8 val)
return status;
}
static int write_field(struct stv *state, u32 field, u8 val)
{
int status;
u8 shift, mask, old, new;
status = read_reg(state, field >> 16, &old);
if (status)
return status;
mask = field & 0xff;
shift = (field >> 12) & 0xf;
new = ((val << shift) & mask) | (old & ~mask);
if (new == old)
return 0;
return write_reg(state, field >> 16, new);
}
#define set_field(_reg, _val) \
write_field(state, state->nr ? FSTV0910_P2_##_reg : \
FSTV0910_P1_##_reg, _val)
#define set_reg(_reg, _val) \
write_reg(state, state->nr ? RSTV0910_P2_##_reg : \
RSTV0910_P1_##_reg, _val)
#define get_reg(_reg, _val) \
read_reg(state, state->nr ? RSTV0910_P2_##_reg : \
RTV0910_P1_##_reg, _val)
static const struct slookup s1_sn_lookup[] = {
{ 0, 9242 }, /* C/N= 0dB */
{ 05, 9105 }, /* C/N=0.5dB */