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path: root/drivers/media/dvb-frontends/mxl5xx.c
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Diffstat (limited to 'drivers/media/dvb-frontends/mxl5xx.c')
-rw-r--r--drivers/media/dvb-frontends/mxl5xx.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/mxl5xx.c b/drivers/media/dvb-frontends/mxl5xx.c
index e899821018a0..483ee7d6198e 100644
--- a/drivers/media/dvb-frontends/mxl5xx.c
+++ b/drivers/media/dvb-frontends/mxl5xx.c
@@ -380,6 +380,38 @@ static int get_algo(struct dvb_frontend *fe)
return DVBFE_ALGO_HW;
}
+static u32 gold2root(u32 gold)
+{
+ u32 x, g, tmp = gold;
+
+ if (tmp >= 0x3ffff)
+ tmp = 0;
+ for (g = 0, x = 1; g < tmp; g++)
+ x = (((x ^ (x >> 7)) & 1) << 17) | (x >> 1);
+ return x;
+}
+
+static int cfg_scrambler(struct mxl *state, u32 gold)
+{
+ u32 root;
+ u8 buf[26] = {
+ MXL_HYDRA_PLID_CMD_WRITE, 24,
+ 0, MXL_HYDRA_DEMOD_SCRAMBLE_CODE_CMD, 0, 0,
+ state->demod, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 1, 0, 0, 0,
+ };
+
+ root = gold2root(gold);
+
+ buf[25] = (root >> 24) & 0xff;
+ buf[24] = (root >> 16) & 0xff;
+ buf[23] = (root >> 8) & 0xff;
+ buf[22] = root & 0xff;
+
+ return send_command(state, sizeof(buf), buf);
+}
+
static int cfg_demod_abort_tune(struct mxl *state)
{
struct MXL_HYDRA_DEMOD_ABORT_TUNE_T abort_tune_cmd;
@@ -437,7 +469,7 @@ static int set_parameters(struct dvb_frontend *fe)
demod_chan_cfg.roll_off = MXL_HYDRA_ROLLOFF_AUTO;
demod_chan_cfg.modulation_scheme = MXL_HYDRA_MOD_AUTO;
demod_chan_cfg.pilots = MXL_HYDRA_PILOTS_AUTO;
- /* cfg_scrambler(state); */
+ cfg_scrambler(state, p->scrambling_sequence_index);
break;
default:
return -EINVAL;