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

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Message-ID: <878uxctd2f.fsf@purkki.adurom.net>
Date:	Tue, 29 Oct 2013 15:35:20 +0200
From:	Kalle Valo <kvalo@...rom.com>
To:	Luca Coelho <luca@...lho.fi>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	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

Luca Coelho <luca@...lho.fi> writes:

> 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?

Yes, this really needs to be in nl80211. I even suggested this years ago
but was turned down at the time. Can't remember the reason anymore.

-- 
Kalle Valo
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