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[PATCH v5 06/11] gpio: exar: Fix reading of directions and values

From Jan Kiszka <jan.kiszka@siemens.com>
Newsgroups linux.kernel
Subject [PATCH v5 06/11] gpio: exar: Fix reading of directions and values
Date 2017-06-02 09:40 +0200
Message-ID <tNPlF-6o8-47@gated-at.bofh.it> (permalink)
References <tNPbZ-6hW-27@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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>
---
 drivers/gpio/gpio-exar.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

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;
 }
-- 
2.12.3

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Thread

[PATCH v5 00/11] serial/gpio: exar: Fixes and support for IOT2000 Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:30 +0200
  [PATCH v5 01/11] serial: exar: Leave MPIOs as output for Commtech adapters Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:30 +0200
  [PATCH v5 04/11] gpio: exar: Allocate resources on behalf of the platform device Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:30 +0200
  [PATCH v5 11/11] serial: exar: Add support for IOT2040 device Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 05/11] gpio: exar: Fix iomap request Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 02/11] gpio-exar/8250-exar: Do not even instantiate a GPIO device for Commtech cards Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 08/11] serial: exar: Factor out platform hooks Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 07/11] gpio-exar/8250-exar: Rearrange gpiochip parenthood Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 10/11] gpio-exar/8250-exar: Make set of exported GPIOs configurable Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
    Re: [PATCH v5 10/11] gpio-exar/8250-exar: Make set of exported GPIOs configurable Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-06-02 12:40 +0200
  [PATCH v5 03/11] gpio-exar/8250-exar: Fix passing in of parent PCI device Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 06/11] gpio: exar: Fix reading of directions and values Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200
  [PATCH v5 09/11] platform: Accept const properties Jan Kiszka <jan.kiszka@siemens.com> - 2017-06-02 09:40 +0200

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