Date: Thu, 9 Apr 2009 14:37:00 -0800 From: Maksim Yevmenkin <maksim.yevmenkin@gmail.com> To: Bruce Simpson <bms@incunabulum.net> Cc: "freebsd-bluetooth@freebsd.org" <freebsd-bluetooth@freebsd.org>, "alexei@raylab.com" <alexei@raylab.com> Subject: Re: libhci update Message-ID: <bb4a86c70904091537x1c6ec085r877d847268b38d3e@mail.gmail.com> In-Reply-To: <49DE6D42.6000004@incunabulum.net> References: <49D92E26.2030508@incunabulum.net> <bb4a86c70904061358l3983ed51m11265859a833f202@mail.gmail.com> <49DD40E2.5030403@incunabulum.net> <1239264003.862926.638.nullmailer@galant.ukfsn.org> <bb4a86c70904091013l2d7c2b77ic7f6988e6e7709f2@mail.gmail.com> <49DE4E2F.2000805@incunabulum.net> <bb4a86c70904091337x7061ab5uf57bbaff1d5f3197@mail.gmail.com> <49DE6D42.6000004@incunabulum.net>
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--001636164aa7ee85e0046726e214 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit On Thu, Apr 9, 2009 at 1:48 PM, Bruce Simpson <bms@incunabulum.net> wrote: [...] >>> I would hope to do the same for libsdp. >> >> well, here is where things might get a bit tricky because of sdpd(8). >> depending on what you want to do, you might need to bring both libsdp >> and sdpd (or whatever it is called these days) from bluez. > > Yup, that's pretty scary because there are significant differences. > > If you look at all the APIs, they all end up building on-the-wire-records to > advertise Bluetooth > services via SDP -- be that L2CAP PSM's, RFCOMM channels, or anything else. oh, no :) please do not open this can of worms :) Iain knows its a very touchy subject with me :) i dislike *intensely* the fact that sdp records have to be built in on-the-wire format. i just dont get why any application has to know about uuid's, sequences and other low level sdp stuff just to register the damn service. that is why i went an extreme route (a bit too extreme perhaps :) and introduced "pre-cooked" sdp records that are constructed on the fly. application only transfers minimum information required to register the service. the downside, of course, is that its not very flexible. in fact, its pretty damn rigid. which means that if you want to introduce new profile, you have to change sdp parts as well. Iain and i beat this horse to death, imo. we think there is really no good way around this and we can only improve api to be more user friendly and require less typing, but the records, unfortunately, would have to be in on-the-wire format (or something pretty damn close to it). > it is irksome that the SDP APIs between OSes differ so radically. > > So I'd make a radical suggestion here: can we change the existing BSD-space > applications > and daemons to use a different name e.g. libbtsdp for the base system? yes, we can. i was actually thinking to merge add the sdp stuff into libbluetooth. and while i'm at it, move bluetooth.h and sdp.h into include/bluetooth/ where it belongs. i just want to get hci stuff out the way first. > That would be a big help for BlueZ compatibility... yes, it sucks, but it's > a hackish fix to the > namespace collision between these two radically different sets of libraries. if we fix our sdp first to be more like bluez (i.e. use on-the-wire format) then we can add compat bluez sdp library that would simply translate bluez call to bsd calls. same route as with libhci. [....] >> i will try to clean up my patches and send them out one more time. i'd >> like to get Iain's comments before putting them into the base. mfc can >> be done quickly as well (if needed). > > OK. That would be great. I can look at such diffs too if need be. :-) > I don't believe an MFC will be too difficult as long as we're in the 7.2 > slush. thanks! i have attached the latest diff. its pretty much the same as previous one, except i added documentation. > [ioctls] >> >> let me know what is missing and i will add it :) > > What's the easiest way to get the unit number? > ... hci nodes do not really have unit numbers. they have names. hci nodes are named as "device+unit+hci". device + unit comes from driver for a particular device. in 99% of the cases it will be "ubtX", i.e. usb dongle, but we also support h4 devices (currently broken due to new tty) and btccc - 3com pccard. so just enumerate all the radios (i.e. list all the hci nodes - there is an ioctl for that) and unit will be the number before "hci" part of the name. however, that will only work if if have devices of the same type in the system (i.e. all the radios are bluetooth dongles). otherwise, if, say, you have 3com pccard and bluetooth dongle, then you will have btccc0hci and ubt0hci nodes both having 0 unit number. >> that is the thing. bd_addr is the only "unique" (it can't be easily >> changed, but it still can be done) thing about bluetooth device. but >> in order to get it, you need to address the device somehow. devname is >> better, but still does not solve the problem as you pointed out it can >> change. > > It would be nice to have a 'device name' registry or be able to > renumber/rename the Bluetooth > dongles in a manner similar to that of what folk end up doing for FreeBSD > using ifconfig(8). i'm not quite follow why is that needed? [....] >> why do you care so much about devid? i assume whatever it is you are >> building, it will have multiple radios, right? are you planning to >> setup different radios in different way? > > Because... (bad English ;o)) > yes we do want to use multiple radios -- inquiry is an expensive operation > -- and also, > BlueCove/JSR-82, PyBlueZ and the other high level language stuff currently > wants to use > dev_id as the unique endpoint identifier. :-( > > They do provide APIs to lookup dev_id from the MAC address, but if that is > used as-is, > any port would still have to maintain the kludge. It is irritating, but that > is what has unfolded. just a stupid idea - "hash" devname into devid? where "hash" does not necessarily means use some real hash function :) could be partitioning function (as in my previously posted code). how wide is devid, you mentioned that it could be as narrow as unit16 and as wide as int? is that correct? thanks, max --001636164aa7ee85e0046726e214 Content-Type: text/plain; charset=US-ASCII; name="bluetooth.hci.diff.txt" Content-Disposition: attachment; filename="bluetooth.hci.diff.txt" Content-Transfer-Encoding: base64 X-Attachment-Id: f_ftc01ckq0 SW5kZXg6IGhjaS5jCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIGhjaS5jCShyZXZpc2lvbiAxOTA4NzApCisrKyBo Y2kuYwkod29ya2luZyBjb3B5KQpAQCAtMzAsMTUgKzMwLDQyMSBAQAogICogJEZyZWVCU0QkCiAg Ki8KIAorI2luY2x1ZGUgPGFzc2VydC5oPgogI2luY2x1ZGUgPGJsdWV0b290aC5oPgogI2luY2x1 ZGUgPHN0ZGlvLmg+CiAjaW5jbHVkZSA8c3RkbGliLmg+CiAjaW5jbHVkZSA8c3RyaW5nLmg+CiAj 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