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

From: Pali Rohár <[email-masked]>
Date: Sun, 8 Dec 2013 08:55:24 +0100

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 <[email-masked]>
> > 
> > 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

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

-- 
Pali Rohár
[email-masked]