linux-kernel - [PATCH 2/2] power: max8925_power.c Check at probe time if power to set online

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Message-ID: <D3390D73-F351-438B-8D25-928539495DC8@marvell.com>
Date:	Thu, 1 Sep 2011 19:11:16 -0700
From:	Philip Rakity <prakity@...vell.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] power: max8925_power.c Check at probe time if power to
  set online

The interrupt for ac on/off can be missed during boot time.
Check if online by seeing if we have power.  We choose 0.5V
since this is high enough to avoid random reading from a
input that could be floating if no charger.

Signed-off-by: Philip Rakity <prakity@...vell.com>
Signed-off-by: Ted Bennett <tbennett@...vell.com>
---
 drivers/power/max8925_power.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/power/max8925_power.c b/drivers/power/max8925_power.c
index b56c78a..31d84c4 100644
--- a/drivers/power/max8925_power.c
+++ b/drivers/power/max8925_power.c
@@ -495,9 +495,15 @@ static __devinit int max8925_init_charger(struct max8925_chip *chip,
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_TOPOFF, "charger-topoff");
 	REQUEST_IRQ(MAX8925_IRQ_VCHG_TMR_FAULT, "charger-timer-expire");
 
-	info->ac_online = 0;
 	info->usb_online = 0;
 	info->bat_online = 0;
+
+	/* check for power - can miss interrupt at boot time */
+	if (start_measure(info, MEASURE_VCHG) * 2000 > 500000)
+		info->ac_online = 1;
+	else
+		info->ac_online = 0;
+
 	ret = max8925_reg_read(info->gpm, MAX8925_CHG_STATUS);
 	if (ret >= 0) {
 		/*
-- 
1.7.6


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