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gpio: pca953x: fix gpio input on gpio offsets >= 8 

This change fixes a regression introduced by commit
f5f0b7aa8 (gpio: pca953x: make the register access by GPIO bank)

When the pca953x driver was converted to using 8-bit reads/writes
the bitmask in pca953x_gpio_get_value wasn't adjusted with a
modulus BANK_SZ and consequently looks at the wrong bits in the
input register.

Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andrew Ruder 2013-08-07 16:52:40 -05:00 committed by Linus Walleij
parent 08a67a58af
commit 40a625daa8
1 changed files with 1 additions and 1 deletions
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2
drivers/gpio/gpio-pca953x.c
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@ -308,7 +308,7 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
return 0;
}
return (reg_val & (1u << off)) ? 1 : 0;
return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
}
static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)