[PATCH 3/8] iio: accel: mma9553: fix gpio bitnum init value

From: Irina Tirdea <irina.tirdea@intel.com>
To: Jonathan Cameron <jic23@kernel.org>,
	linux-iio@vger.kernel.org, Hartmut Knaack <knaack.h@gmx.de>
Cc: linux-kernel@vger.kernel.org, Irina Tirdea <irina.tirdea@intel.com>
Subject: [PATCH 3/8] iio: accel: mma9553: fix gpio bitnum init value
Date: Wed,  8 Apr 2015 17:37:32 +0300	[thread overview]
Message-ID: <1428503857-9081-4-git-send-email-irina.tirdea@intel.com> (raw)
In-Reply-To: <1428503857-9081-1-git-send-email-irina.tirdea@intel.com>

Initial value of gpio bitnum is set to -1, but
the variable is declared as unsigned.

Use a positive invalid value for initial gpio
bitnum.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Suggested-by: Hartmut Knaack <knaack.h@gmx.de>
---
 drivers/iio/accel/mma9553.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
index 9cfedb5..d781999 100644
--- a/drivers/iio/accel/mma9553.c
+++ b/drivers/iio/accel/mma9553.c
@@ -78,6 +78,7 @@
 
 /* Bitnum used for GPIO configuration = bit number in high status byte */
 #define MMA9553_STATUS_TO_BITNUM(bit)	(ffs(bit) - 9)
+#define MMA9553_MAX_BITNUM		MMA9553_STATUS_TO_BITNUM(BIT(16))
 
 #define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
 
@@ -406,8 +407,8 @@ static int mma9553_init(struct mma9553_data *data)
 	}
 
 
-	data->gpio_bitnum = -1;
 	/* Reset GPIO */
+	data->gpio_bitnum = MMA9553_MAX_BITNUM;
 	ret = mma9553_conf_gpio(data);
 	if (ret < 0)
 		return ret;
-- 
1.9.1

