linux-kernel - [PATCH] drivers/w1/masters/w1-gpio.c: fix read

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Message-Id: <1236614530-11153-1-git-send-email-daniel@caiaq.de>
Date:	Mon,  9 Mar 2009 17:02:10 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	linux-kernel@...r.kernel.org
Cc:	Daniel Mack <daniel@...aq.de>, Ville Syrjala <syrjala@....fi>,
	Evgeniy Polyakov <johnpol@....mipt.ru>
Subject: [PATCH] drivers/w1/masters/w1-gpio.c: fix read_bit()

W1 master implementations are expected to return 0 or 1 from their
read_bit() function. However, not all platforms do return these values
from gpio_get_value() - namely PXAs won't. Hence the w1 gpio-master
needs to break the result down to 0 or 1 itself.

Signed-off-by: Daniel Mack <daniel@...aq.de>
Cc: Ville Syrjala <syrjala@....fi>
Cc: Evgeniy Polyakov <johnpol@....mipt.ru>
---
 drivers/w1/masters/w1-gpio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index 9e1138a..a411702 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -39,7 +39,7 @@ static u8 w1_gpio_read_bit(void *data)
 {
 	struct w1_gpio_platform_data *pdata = data;
 
-	return gpio_get_value(pdata->pin);
+	return gpio_get_value(pdata->pin) ? 1 : 0;
 }
 
 static int __init w1_gpio_probe(struct platform_device *pdev)
-- 
1.6.1.3

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