diff mbox

[v3,06/10] gpio: exar: Fix reading of directions and values

Message ID 7678f5c040c6b578fa008c9b510bb936a218310c.1495814557.git.jan.kiszka@siemens.com
State New
Headers show

Commit Message

Jan Kiszka May 26, 2017, 4:02 p.m. UTC 
First, the logic for translating a register bit to the return code of
exar_get_direction and exar_get_value were wrong. And second, there was
a flip regarding the register bank in exar_get_direction.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 drivers/gpio/gpio-exar.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Comments

Linus Walleij May 29, 2017, 12:33 p.m. UTC | #1 
On Fri, May 26, 2017 at 6:02 PM, Jan Kiszka <jan.kiszka@siemens.com> wrote:

> First, the logic for translating a register bit to the return code of
> exar_get_direction and exar_get_value were wrong. And second, there was
> a flip regarding the register bank in exar_get_direction.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

Acked-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij
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diff mbox

Patch

diff --git a/drivers/gpio/gpio-exar.c b/drivers/gpio/gpio-exar.c
index b29890b143ce..f3585a184f39 100644
--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -68,7 +68,7 @@  static int exar_get(struct gpio_chip *chip, unsigned int reg)
 	value = readb(exar_gpio->regs + reg);
 	mutex_unlock(&exar_gpio->lock);
 
-	return !!value;
+	return value;
 }
 
 static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
@@ -78,7 +78,7 @@  static int exar_get_direction(struct gpio_chip *chip, unsigned int offset)
 	int val;
 
 	addr = bank ? EXAR_OFFSET_MPIOSEL_HI : EXAR_OFFSET_MPIOSEL_LO;
-	val = exar_get(chip, addr) >> (offset % 8);
+	val = exar_get(chip, addr) & BIT(offset % 8);
 
 	return !!val;
 }
@@ -89,8 +89,8 @@  static int exar_get_value(struct gpio_chip *chip, unsigned int offset)
 	unsigned int addr;
 	int val;
 
-	addr = bank ? EXAR_OFFSET_MPIOLVL_LO : EXAR_OFFSET_MPIOLVL_HI;
-	val = exar_get(chip, addr) >> (offset % 8);
+	addr = bank ? EXAR_OFFSET_MPIOLVL_HI : EXAR_OFFSET_MPIOLVL_LO;
+	val = exar_get(chip, addr) & BIT(offset % 8);
 
 	return !!val;
 }