lkml.org 
[lkml]   [2013]   [Dec]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 03/16] wl1251: add sysfs interface for bluetooth coexistence mode configuration
From
Date
On Sun, 2013-12-08 at 08:55 +0100, Pali Rohár wrote:
> On Tuesday 29 October 2013 00:39:47 Ben Hutchings wrote:
> > On Sat, 2013-10-26 at 22:34 +0200, Pali Rohár wrote:
> > > From: David Gnedt <david.gnedt@davizone.at>
> > >
> > > Port the bt_coex_mode sysfs interface from wl1251 driver
> > > version included in the Maemo Fremantle kernel to allow
> > > bt-coexistence mode configuration. This enables userspace
> > > applications to set one of the modes WL1251_BT_COEX_OFF,
> > > WL1251_BT_COEX_ENABLE and WL1251_BT_COEX_MONOAUDIO. The
> > > default mode is WL1251_BT_COEX_OFF.
> > > It should be noted that this driver always enabled
> > > bt-coexistence before and enabled bt-coexistence directly
> > > affects the receiving performance, rendering it unusable in
> > > some low-signal situations. Especially monitor mode is
> > > affected very badly with bt-coexistence enabled.
> >
> > [...]
> >
> > This should be implemented consistently with other drivers:
> >
> > drivers/net/wireless/ath/ath9k/htc_drv_init.c:module_param_nam
> > ed(btcoex_enable, ath9k_htc_btcoex_enable, int, 0444);
> > drivers/net/wireless/ath/ath9k/init.c:module_param_named(btco
> > ex_enable, ath9k_btcoex_enable, int, 0444);
> > drivers/net/wireless/b43/main.c:module_param_named(btcoex,
> > modparam_btcoex, int, 0444);
> > drivers/net/wireless/ipw2x00/ipw2200.c:module_param(bt_coexis
> > t, int, 0444);
> > drivers/net/wireless/iwlegacy/common.c:module_param(bt_coex_a
> > ctive, bool, S_IRUGO);
> > drivers/net/wireless/iwlwifi/iwl-drv.c:module_param_named(bt_
> > coex_active, iwlwifi_mod_params.bt_coex_active,
> > drivers/net/wireless/ti/wlcore/sysfs.c:static
> > DEVICE_ATTR(bt_coex_state, S_IRUGO | S_IWUSR,
> >
> > Oh, hmm, I see a problem here.
> >
> > Ben.
>
> So where is consitency? Each driver doing this in different way:
> btcoex_enable, btcoex, bt_coexist, bt_coex_active

Indeed, it's a bigger problem than one driver and this isn't really an
objection to your patch. I suppose there should be an nl80211 attribute
to control this behaviour per-interface. You or any other wireless
networking developer could work on that.

Ben.

> Reason for this usage in wl1251 is to not break existing
> userspace applications.

--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-12-08 18:01    [W:0.116 / U:20.744 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site