From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail2.candelatech.com ([208.74.158.173]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZTug3-00026h-75 for ath10k@lists.infradead.org; Mon, 24 Aug 2015 16:32:56 +0000 Message-ID: <55DB4720.1090106@candelatech.com> Date: Mon, 24 Aug 2015 09:32:32 -0700 From: Ben Greear MIME-Version: 1.0 Subject: Re: How to access the CCA related operation References: <006a01d0de35$1bde70a0$539b51e0$@netlab.snu.ac.kr> In-Reply-To: <006a01d0de35$1bde70a0$539b51e0$@netlab.snu.ac.kr> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: Seowoo Jang , ath10k@lists.infradead.org It is in firmware, and you cannot reliably poke it through the driver read/write register API because each time the radio resets (channel change, etc), it is liable to re-write the CCA registers back to default values. There is a large list of registers with 'CCA' in the name, but I don't know what they really mean, and I had hard time getting that info out of QCA. If you have any better luck, please post whatever you can share. Thanks, Ben On 08/23/2015 11:21 PM, Seowoo Jang wrote: > Hello, > > We are trying to evaluate our idea on 802.11ac protocol with Atheros qca9880 > / ath10k driver. > > We would like to be able to access/know the result of the CCA (clear channel > assessment) operation > or the level of interference on the carrier when we need. > > We have dug into the driver files and concluded that the CCA related values > are likely > in the firmware or on the registers of the hardware. > > And please correct us if we are thinking wrong. > > We would appreciate the help if someone can give us some starting points, > such as the address of the register that stores the carrier sensing values > (CCA values) > or the result of it (whether the carrier is busy or idle), to investigate. > > The chipset we are using is compex WLE900VX-7AA. > > We are currently using Ubuntu 14.04.03 with kernel version 4.1.5, > but we can use any versions of OS and kernel if they support 802.11ac > bandwidth. > > Thank you for help in advance. > > ------------------------------- > Seowoo Jang, Ph.D. > Ubiquitous Network Laboratory > EECS, Seoul National University > > CEL +82-10-3723-3401 > E-mail swjang@netlab.snu.ac.kr > ------------------------------- > > > _______________________________________________ > ath10k mailing list > ath10k@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/ath10k > -- Ben Greear Candela Technologies Inc http://www.candelatech.com _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k