netdev - Re: [PATCH 03/16] wl1251: add sysfs interface for bluetooth coexistence mode configuration

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Date:	Tue, 29 Oct 2013 09:09:25 +0200
From:	Luca Coelho <luca@...lho.fi>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	"John W. Linville" <linville@...driver.com>,
	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, freemangordon@....bg,
	aaro.koskinen@....fi, pavel@....cz, sre@...g0.de,
	joni.lapilainen@...il.com, David Gnedt <david.gnedt@...izone.at>
Subject: Re: [PATCH 03/16] wl1251: add sysfs interface for bluetooth
 coexistence mode configuration

On Mon, 2013-10-28 at 23:39 +0000, Ben Hutchings wrote:
> On Sat, 2013-10-26 at 22:34 +0200, Pali Rohár wrote:
> > From: David Gnedt <david.gnedt@...izone.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_named(btcoex_enable, ath9k_htc_btcoex_enable, int, 0444);
> drivers/net/wireless/ath/ath9k/init.c:module_param_named(btcoex_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_coexist, int, 0444);
> drivers/net/wireless/iwlegacy/common.c:module_param(bt_coex_active, 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.

With so many drivers doing the same thing, isn't it about time to add
this to nl80211?

--
Luca.

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