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

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Date:	Mon, 28 Oct 2013 23:39:47 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Pali Rohár <pali.rohar@...il.com>
CC:	Luciano Coelho <luca@...lho.fi>,
	"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 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.

Ben.

-- 
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.

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