linux-kernel - [PATCH] gpio: Fix bit masking in Kontron PLD GPIO driver

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Date:	Fri, 9 Aug 2013 17:33:26 +0200
From:	Michael Brunner <mibru@....de>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Kevin Strasser <strassek@...r.orst.edu>,
	Darren Hart <dvhart@...ux.intel.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Chris Healy <chealy@...co-us.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org
Subject: [PATCH] gpio: Fix bit masking in Kontron PLD GPIO driver

This patch fixes the bit masking within the GPIO driver. The masking is
basically done twice which causes the wrong GPIOs to be addressed.

Signed-off-by: Michael Brunner <michael.brunner@...tron.com>
---
 drivers/gpio/gpio-kempld.c |   24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/gpio/gpio-kempld.c b/drivers/gpio/gpio-kempld.c
index d3ed563..6118b66 100644
--- a/drivers/gpio/gpio-kempld.c
+++ b/drivers/gpio/gpio-kempld.c
@@ -46,9 +46,9 @@ static void kempld_gpio_bitop(struct kempld_device_data *pld,
 
        status = kempld_read8(pld, reg);
        if (val)
-               status |= (1 << bit);
+               status |= KEMPLD_GPIO_MASK(bit);
        else
-               status &= ~(1 << bit);
+               status &= ~KEMPLD_GPIO_MASK(bit);
        kempld_write8(pld, reg, status);
 }
 
@@ -60,7 +60,7 @@ static int kempld_gpio_get_bit(struct kempld_device_data *pld, u8 reg, u8 bit)
        status = kempld_read8(pld, reg);
        kempld_release_mutex(pld);
 
-       return !!(status & (1 << bit));
+       return !!(status & KEMPLD_GPIO_MASK(bit));
 }
 
 static int kempld_gpio_get(struct gpio_chip *chip, unsigned offset)
@@ -69,8 +69,7 @@ static int kempld_gpio_get(struct gpio_chip *chip, unsigned offset)
                = container_of(chip, struct kempld_gpio_data, chip);
        struct kempld_device_data *pld = gpio->pld;
 
-       return kempld_gpio_get_bit(pld, KEMPLD_GPIO_LVL_NUM(offset),
-                                  KEMPLD_GPIO_MASK(offset));
+       return kempld_gpio_get_bit(pld, KEMPLD_GPIO_LVL_NUM(offset), offset);
 }
 
 static void kempld_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
@@ -80,8 +79,7 @@ static void kempld_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
        struct kempld_device_data *pld = gpio->pld;
 
        kempld_get_mutex(pld);
-       kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL_NUM(offset),
-                         KEMPLD_GPIO_MASK(offset), value);
+       kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL_NUM(offset), offset, value);
        kempld_release_mutex(pld);
 }
 
@@ -92,8 +90,7 @@ static int kempld_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
        struct kempld_device_data *pld = gpio->pld;
 
        kempld_get_mutex(pld);
-       kempld_gpio_bitop(pld, KEMPLD_GPIO_DIR_NUM(offset),
-                         KEMPLD_GPIO_MASK(offset), 0);
+       kempld_gpio_bitop(pld, KEMPLD_GPIO_DIR_NUM(offset), offset, 0);
        kempld_release_mutex(pld);
 
        return 0;
@@ -107,10 +104,8 @@ static int kempld_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
        struct kempld_device_data *pld = gpio->pld;
 
        kempld_get_mutex(pld);
-       kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL_NUM(offset),
-                         KEMPLD_GPIO_MASK(offset), value);
-       kempld_gpio_bitop(pld, KEMPLD_GPIO_DIR_NUM(offset),
-                         KEMPLD_GPIO_MASK(offset), 1);
+       kempld_gpio_bitop(pld, KEMPLD_GPIO_LVL_NUM(offset), offset, value);
+       kempld_gpio_bitop(pld, KEMPLD_GPIO_DIR_NUM(offset), offset, 1);
        kempld_release_mutex(pld);
 
        return 0;
@@ -122,8 +117,7 @@ static int kempld_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
                = container_of(chip, struct kempld_gpio_data, chip);
        struct kempld_device_data *pld = gpio->pld;
 
-       return kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset),
-                                  KEMPLD_GPIO_MASK(offset));
+       return kempld_gpio_get_bit(pld, KEMPLD_GPIO_DIR_NUM(offset), offset);
 }
 
 static int kempld_gpio_pincount(struct kempld_device_data *pld)
--
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