Richard Farina wrote:
> Dave wrote:
>> Richard Farina wrote:
>>> David Kilroy wrote:
>>>> Added mappings for FHSS, DSSS and OFDM channels - with macros to point
>>>> HR DSSS and ERP to the DSSS mappings. Currently just static inline
>>>> functions.
>>>> +static inline int ieee80211_ofdm_chan_to_freq(int s_freq, int channel)
>>>> +{
>>>> + if ((channel > 0) && (channel <= 200) &&
>>>> + (s_freq >= 4000))
>>>> + return s_freq + (channel * 5);
>>>> + else
>>>> + return -1;
>>>> +}
>>> Any desire to make 184-196 work? These are the 4.9 GHz channels.
>> Do you see a reason why these channels wouldn't work with these
>> conversion routines? Or are you asking about corresponding driver support?
> Channel 165 freq is 5825MHz
> Channel 183 freq is 4915MHz
>
> Since your method is linear and 183 is greater than 165, it will output
> a higher frequency for 183 than for 165 when converting from channel to
> freq.
I suspect you're talking about US regulatory class 5 which names channel
165 with a starting frequency of 5GHz, and Japans regulatory class 16-20
naming channel 183 with starting frequency 4GHz. These are accounted
for in the conversion routines by the s_freq parameter:
ieee80211_ofdm_chan_to_freq(5000, 165) ==> 5825
ieee80211_ofdm_chan_to_freq(4000, 183) ==> 4915
It means the caller must know the starting frequency when converting
OFDM channels and frequencies. I expect that this number will come from
the regulatory work that is underway (though I haven't been keeping
track of that).
Regards,
Dave.
>> If drivers don't currently support those channels, I suspect there's a
>> more significant issue to be addressed first.
> No drivers support these channels at the moment AFAIK but I'd be happy
> to submit a patch that enables tuning if someone else could submit a
> patch to support half/quarter clocked channels. Japan is the only place
> in the world that supports the 4.9GHz realm unlicensed, and I've already
> been told that patches that enabled licensed only features will not be
> accepted so I have not bothered to submit support as I lack the skill to
> add support for half/quarter clock channels and hence it wouldn't be
> unlicensed.
>
> Thanks,
> Rick Farina
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