linux-kernel - [PATCH] Extcon: Notify changed state for only one cable to notifee

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Date:	Fri, 27 Apr 2012 15:17:28 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	gregkh@...uxfoundation.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] Extcon: Notify changed state for only one cable to notifee

This patch inform the state of only one cable instead of previous data
including the state of 32 cables to notifee which use
extcon_register_interest()
function to monitor whether the specific cable is attachd or detached.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/extcon/extcon_class.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/extcon/extcon_class.c b/drivers/extcon/extcon_class.c
index dbd3bfb..9cf3166 100644
--- a/drivers/extcon/extcon_class.c
+++ b/drivers/extcon/extcon_class.c
@@ -425,8 +425,15 @@ static int _call_per_cable(struct notifier_block
*nb, unsigned long val,

 	if ((val & (1 << obj->cable_index)) !=
 	    (edev->state & (1 << obj->cable_index))) {
+		bool cable_state = true;
+
 		obj->previous_value = val;
-		return obj->user_nb->notifier_call(obj->user_nb, val, ptr);
+
+		if (val & (1 << obj->cable_index))
+			cable_state = false;
+
+		return obj->user_nb->notifier_call(obj->user_nb,
+				cable_state, ptr);
 	}

 	return NOTIFY_OK;
-- 
1.7.0.4

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