[linux-dvb] Sending diseqc commands on DST frontend

Manu Abraham abraham.manu at gmail.com
Mon Oct 24 13:44:46 CEST 2005


Philip Prindeville wrote:

> I'm looking at:
>
> static int dst_set_diseqc (struct dst_data *dst, u8 *cmd, u8 len)
> {
>        u8 paket[8] =  {0x00, 0x08, 0x04, 0xe0, 0x10, 0x38, 0xf0, 0xec };
>
>        if (dst->dst_type == DST_TYPE_IS_TERR)
>                return 0;
>
>        if (len == 0 || len > 4)
>                return -EINVAL;
>        memcpy(&paket[3], cmd, len);
>        paket[7] = dst_check_sum (&paket[0], 7);
>        dst_command(dst, paket, 8);
>        return 0;
> }
>
> in linuxtv-dvb-1.1.1/linux/drivers/media/dvb/frontends/dst.c
> and I'm not sure why the limitation of 4 bytes length...  Isn't
> the spec for up to 4 bytes of command plus framing and address,
> i.e. 6 bytes total?
>

DiSEqC commands can be 3 , 4 or 5 byte in length.
for 3 byte commands it is <framing><Address><Command>
for 4 byte commands <framing><address><command><data>
for 5 byte commands <framing><address><command><data1><data2>

when you say 6 bytes, that is including the framing.

> What am I missing?
>

The old cards, you can see from the dst_tlist, that they supported only
3 or 4 byte lengths of diseqc commands.
Can you please try out the attached patch ?

The first patch bt8xx_cleanup.patch is just a cleanup patch.
The second one is the diseqc patch.

Since my patch was a bit too large and got stuck, i am compressing it  ..

Manu





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