RTL8188S

RTL8188S

[p2p]

Hello,

I have a WLAN dongle with Realtek RTL8188S chip.
I don't want to use r8712u driver with wext interface because I want to 
establish a wifi direct p2p connection.
Unfortunately the original Realtek driver from hp didn't work with p2p 
too.
I thought RTL8192cu will work, but Larry F. told me it doesn't.

He said there is a new driver in development.
I'm searching for information. Please can someone tell me about the 
project, its status, and if someone can take part.

Best regards
p2p

Re: RTL8188S

[Christian Lamparter]

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Re: RTL8188S

[Larry Finger]

On 11/25/2013 03:57 PM, Christian Lamparter wrote:
>> I thought RTL8192cu will work, but Larry F. told me it doesn't.
> OK? (care to explain?)

The driver for an RTL81{88,92}CU device (rtl8192cu) will not work for the 
RTL81{88,92}SU device. There are substantial differences between the CU and SU 
chips.

Larry

Re: RTL8188S

[Christian Lamparter]

On Monday, November 25, 2013 04:12:14 PM Larry Finger wrote:
> On 11/25/2013 03:57 PM, Christian Lamparter wrote:
> >> I thought RTL8192cu will work, but Larry F. told me it doesn't.
> > OK? (care to explain?)
> 
> The driver for an RTL81{88,92}CU device (rtl8192cu) will not work for the 
> RTL81{88,92}SU device. There are substantial differences between the CU and SU 
> chips.

Thanks. I first thought a RTL81xyCU device was involved somehow (for example
as the P2P GO peer on the other end, or as a replacement for rtl8192su device).

But apparently not... well, that's too bad.

Regards

Christian

Re: RTL8188S

[p2p]

Dear Mr. Lamparter,

Am 25.11.2013 22:57 schrieb Christian Lamparter:
> On Monday, November 25, 2013 06:57:32 PM p2p@posteo.de wrote:
>> I have a WLAN dongle with Realtek RTL8188S chip.
>> I don't want to use r8712u driver with wext interface
>> because I want to establish a wifi direct p2p connection.
>
> AFICT, you should be able to connect to a p2p-go peer
> even if your device (in this case rtl8188s) only supports
> station mode...
>

How do I do this?

>> Unfortunately the original Realtek driver from hp didn't
>> work with p2p too.
> Why, what happens in this case?
>

I have downloaded the driver from:
http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188SU

Installed and loaded the module 8712u.

"iw list" doesn't list p2p-client or p2p-go.

wpa_cli command p2p_find results in FAIL.

wpa_supplicant ouput:

CTRL_IFACE monitor attached - hexdump(len=21): 2f 74 6d 70 2f 77 70 61 
5f 63 74 72 6c 5f 32 34 39 37 2d 32 00
1385328422.214780: RX ctrl_iface - hexdump_ascii(len=8):
      50 32 50 5f 46 49 4e 44                           P2P_FIND
1385328422.214893: wlan0: Control interface command 'P2P_FIND'

-> but nothing more...

>> I thought RTL8192cu will work, but Larry F. told me it doesn't.
> OK? (care to explain?)
>
>> He said there is a new driver in development.
> Sort of. There's r92su, however this driver only supports what the
> firmware is able to do (station, ad-hoc and a limited monitor mode).
>
>> I'm searching for information. Please can someone tell me about
>> the project, its status, and if someone can take part.
> Hey that's good to hear. The future of "r92su" was discussed in [0],
> [1], ... The good news is:
>

I followed the thread.
It shows me that it makes no sense. I am a beginner and I only can 
spent time for it if someone tells me for example: fill this module with 
code for this specific function. I have good literature and I think I 
can try to help but not lead something.

Best regards
p2p

Re: RTL8188S

[Christian Lamparter]

Dear Ms./Mr. ...?

On Tuesday, November 26, 2013 05:47:48 PM p2p@posteo.de wrote:
> Am 25.11.2013 22:57 schrieb Christian Lamparter:
> > On Monday, November 25, 2013 06:57:32 PM p2p@posteo.de wrote:
> >> I have a WLAN dongle with Realtek RTL8188S chip.
> >> I don't want to use r8712u driver with wext interface
> >> because I want to establish a wifi direct p2p connection.
> >
> > AFICT, you should be able to connect to a p2p-go peer
> > even if your device (in this case rtl8188s) only supports
> > station mode...
> >
> How do I do this?
"station mode"!

The theory is: the p2p group owner (go) peer behaves pretty much
like an Access Point. Hence, legacy devices  like the rtl81yySx
can connect to it the same way like they would connect to an
accesspoint or router. 

No "magic" driver or anything is needed. If you can connect to a
run-of-the-mill protected AP, you can connect to a running wifi-direct
network.
 
> >> Unfortunately the original Realtek driver from hp didn't
> >> work with p2p too.
> > Why, what happens in this case?
> >
> 
> I have downloaded the driver from:
> http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188SU

this would also have worked with r8712u or r92su.
 
> Installed and loaded the module 8712u.
> 
> "iw list" doesn't list p2p-client or p2p-go.

"station mode" "station mode" and again "station mode".

"station mode" != "p2p-go" or "p2p-client". Just fire up your peer
device and let the driver connect (either via WPA2-PSK or WPS). You
don't need to deal with the console at all, this all can be done 
with the push of a GUI button (NetworkManager, wicd, ...). 

Remember: Do it like you simply want to connect to your AP.
(no p2p magic!)
 
> >> I thought RTL8192cu will work, but Larry F. told me it doesn't.
> > OK? (care to explain?)
> >
> >> He said there is a new driver in development.
> > Sort of. There's r92su, however this driver only supports what the
> > firmware is able to do (station, ad-hoc and a limited monitor mode).
> >
> >> I'm searching for information. Please can someone tell me about
> >> the project, its status, and if someone can take part.
> > Hey that's good to hear. The future of "r92su" was discussed in [0],
> > [1], ... The good news is:
> >
> 
> I followed the thread.
> It shows me that it makes no sense. I am a beginner and I only can 
> spent time for it if someone tells me for example: fill this module with 
> code for this specific function. I have good literature and I think I 
> can try to help but not lead something.

Hey that's great, that's exactly what needs to be "done". ;-)

Larry has already written a framework for realtek wifi devices. The rtl8192su
device can make use of this. You just need to lift the "firmware parser", 
"device initialization" from the other vendor driver at: [0]. And wire it into
the Larry's rtlwifi framework. 

You don't need to start from scratch either. In the git-tree of r92su, there 
is already an directory with an old rtl8192su driver [it also uses the r92su
firmware and not the one from the driver in [0], so needs to be considered].
But definitely not like the material isn't there. It just hasn't been put
together. Also, you can look at rtl8192cu and rtl8192se if you need some
guidance with rtlwifi. They should provide enough ideas to get a working
driver.

Regards,

Christian

[0] <www.edimax.com/images/Image/OpenSourceCode/Wireless/Router/AR-7284WnA/AR-7284WnA&B_SDK_6222.tar.zip>
    (See the post in the ML thread, it lists the directory of the driver and
     firmware components)

Re: RTL8188S

[p2p]

Dear Mr. Lamparter,

Am 26.11.2013 21:38 schrieb Christian Lamparter:
> Dear Ms./Mr. ...?
>
> On Tuesday, November 26, 2013 05:47:48 PM p2p@posteo.de wrote:
>> Am 25.11.2013 22:57 schrieb Christian Lamparter:
>> > On Monday, November 25, 2013 06:57:32 PM p2p@posteo.de wrote:
>> >> I have a WLAN dongle with Realtek RTL8188S chip.
>> >> I don't want to use r8712u driver with wext interface
>> >> because I want to establish a wifi direct p2p connection.
>> >
>> > AFICT, you should be able to connect to a p2p-go peer
>> > even if your device (in this case rtl8188s) only supports
>> > station mode...
>> >
>> How do I do this?
> "station mode"!
>
> The theory is: the p2p group owner (go) peer behaves pretty much
> like an Access Point. Hence, legacy devices  like the rtl81yySx
> can connect to it the same way like they would connect to an
> accesspoint or router.
>
> No "magic" driver or anything is needed. If you can connect to a
> run-of-the-mill protected AP, you can connect to a running 
> wifi-direct
> network.
>
>> >> Unfortunately the original Realtek driver from hp didn't
>> >> work with p2p too.
>> > Why, what happens in this case?
>> >
>>
>> I have downloaded the driver from:
>> 
>> http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=48&PFid=48&Level=5&Conn=4&DownTypeID=3&GetDown=false&Downloads=true#RTL8188SU
>
> this would also have worked with r8712u or r92su.
>
>> Installed and loaded the module 8712u.
>>
>> "iw list" doesn't list p2p-client or p2p-go.
>
> "station mode" "station mode" and again "station mode".
>
> "station mode" != "p2p-go" or "p2p-client". Just fire up your peer
> device and let the driver connect (either via WPA2-PSK or WPS). You
> don't need to deal with the console at all, this all can be done
> with the push of a GUI button (NetworkManager, wicd, ...).
>
> Remember: Do it like you simply want to connect to your AP.
> (no p2p magic!)
>

We need the "p2p magic" to develop a linux miracast sink.

>> I followed the thread.
>> It shows me that it makes no sense. I am a beginner and I only can
>> spent time for it if someone tells me for example: fill this module 
>> with
>> code for this specific function. I have good literature and I think 
>> I
>> can try to help but not lead something.
>
> Hey that's great, that's exactly what needs to be "done". ;-)
>

I don't know yet if I have the time to take part. But as I wrote I have 
a good book which describes in detail driver development for 2.6 kernel.

What do you think how many LOC have to been written?

Best regards
p2p

Re: RTL8188S

[Christian Lamparter]

Hello - Still don't know your Name - 
On Tuesday, December 03, 2013 08:14:08 PM p2p@posteo.de wrote:
> Am 26.11.2013 21:38 schrieb Christian Lamparter:
>
> We need the "p2p magic" to develop a linux miracast sink.
Sounds a bit like OpenWFD [0], or is this unrelated? 
 
> >> I followed the thread.
> >> It shows me that it makes no sense. I am a beginner and I only can
> >> spent time for it if someone tells me for example: fill this module 
> >> with
> >> code for this specific function. I have good literature and I think 
> >> I
> >> can try to help but not lead something.
> >
> > Hey that's great, that's exactly what needs to be "done". ;-)
> >
> 
> I don't know yet if I have the time to take part. But as I wrote I have 
> a good book which describes in detail driver development for 2.6 kernel.
> 
> What do you think how many LOC have to been written?
Ok?!

rtl8192cu has around 8600 LOCs, rtl8192se has around 10700. That said,
realtek's own 8190n driver comes in at 90 000+ LOCs driver [of course,
that driver comes with its own stack, sme and maybe a few other bells
and whiles]. I guess the answer here is really: take what ever number
you prefer :-D.

Regards,

Christian

[0] <http://www.freedesktop.org/wiki/Software/openwfd/>

Re: RTL8188S

[Christian Lamparter]

(readded cc)

Hello Peter,

On Wednesday, December 04, 2013 07:10:01 PM p2p@posteo.de wrote:
> >> I don't know yet if I have the time to take part. But as I wrote I 
> >> have a good book which describes in detail driver development for
> >> 2.6 kernel.
> >>
> >> What do you think how many LOC have to been written?
> > Ok?!
> >
> > rtl8192cu has around 8600 LOCs, rtl8192se has around 10700. That 
> > said,
> > realtek's own 8190n driver comes in at 90 000+ LOCs driver [of 
> > course,
> > that driver comes with its own stack, sme and maybe a few other bells
> > and whiles]. I guess the answer here is really: take what ever number
> > you prefer :-D.
> >
> 
> What do you think how many percent can be written by copy and paste?

I think this problem has to be approached from two sides.

1.
In theory (as in CS theory) everything you need is basically a carefully
selected string of 0 and 1s. [That said: it is very hard to develop this way.
but it would be cool - certainly a "one of a kind" approach in these days.
It would be familiar with those who ever had to use punch cards and a 
"one-shot" hole puncher].
=> need to copy & paste just 2 bits

2.
rtlwifi should already provide a decent framework/foundation for such a
driver. So no need to copy anything, you just have to use the API that's
already in place. If you need a function from rtl8192se or rtl8192cu, you
shouldn't copy it, but move it to the shared library code instead.
=> no copy & paste at all.

Summary: 
"A driver can be copied & pasted together from just two bits (that would a
cool "best case")... or it could be: every single line needs to be written
by hand (is this the "worst case"? or is it the other way around)."

[I think these "statistics" only work, if the project is already "done",
or at least at the "almost nearly done" milestone.]

Regards,

Christian