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[media] af9033: implement ber and ucb functions

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af9033: implement read_ber and read_ucblocks functions. Version 2 of patch that
reflects my findings on the behaviour of abort_cnt, err_cnt and bit_cnt:

- bit_cnt is always 0x2710 (10000)
- abort_cnt is between 0 and 0x2710
- err_cnt is between 0 and 640000 (= 0x2710 * 8 * 8)

in the current implementation BER is calculated as the number of bit errors per
processed bits, ignoring those bits that are already discarded and counted in
abort_cnt, i.e. UCBLOCKS.

Signed-off-by: Hans-Frieder Vogt <hfvogt@gmx.net>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans-Frieder Vogt 2012-04-07 10:34:34 -03:00 committed by Mauro Carvalho Chehab
parent 3234bd2f19
commit 47eafa5427
1 changed files with 63 additions and 2 deletions
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65
drivers/media/dvb/frontends/af9033.c
View File

@ -29,6 +29,10 @@ struct af9033_state {
u32 bandwidth_hz;
bool ts_mode_parallel;
bool ts_mode_serial;
u32 ber;
u32 ucb;
unsigned long last_stat_check;
};
/* write multiple registers */
@ -772,16 +776,73 @@ static int af9033_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
return ret;
}
static int af9033_update_ch_stat(struct af9033_state *state)
{
int ret = 0;
u32 err_cnt, bit_cnt;
u16 abort_cnt;
u8 buf[7];
/* only update data every half second */
if (time_after(jiffies, state->last_stat_check + msecs_to_jiffies(500))) {
ret = af9033_rd_regs(state, 0x800032, buf, sizeof(buf));
if (ret < 0)
goto err;
/* in 8 byte packets? */
abort_cnt = (buf[1] << 8) + buf[0];
/* in bits */
err_cnt = (buf[4] << 16) + (buf[3] << 8) + buf[2];
/* in 8 byte packets? always(?) 0x2710 = 10000 */
bit_cnt = (buf[6] << 8) + buf[5];
if (bit_cnt < abort_cnt) {
abort_cnt = 1000;
state->ber = 0xffffffff;
} else {
/* 8 byte packets, that have not been rejected already */
bit_cnt -= (u32)abort_cnt;
if (bit_cnt == 0) {
state->ber = 0xffffffff;
} else {
err_cnt -= (u32)abort_cnt * 8 * 8;
bit_cnt *= 8 * 8;
state->ber = err_cnt * (0xffffffff / bit_cnt);
}
}
state->ucb += abort_cnt;
state->last_stat_check = jiffies;
}
return 0;
err:
pr_debug("%s: failed=%d\n", __func__, ret);
return ret;
}
static int af9033_read_ber(struct dvb_frontend *fe, u32 *ber)
{
*ber = 0;
struct af9033_state *state = fe->demodulator_priv;
int ret;
ret = af9033_update_ch_stat(state);
if (ret < 0)
return ret;
*ber = state->ber;
return 0;
}
static int af9033_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
*ucblocks = 0;
struct af9033_state *state = fe->demodulator_priv;
int ret;
ret = af9033_update_ch_stat(state);
if (ret < 0)
return ret;
*ucblocks = state->ucb;
return 0;
}