Messages in this thread Patch in this message | | | From | Andreas Larsson <> | Subject | [PATCH 1/2] gpio: gpio-generic: Fix bug in big endian bit conversion | Date | Tue, 5 Feb 2013 11:33:02 +0100 |
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The swap to convert LE to BE in bgpio_pin2mask_be should be on byte level, not on bit level.
Signed-off-by: Andreas Larsson <andreas@gaisler.com> --- drivers/gpio/gpio-generic.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index 05fcc0f..7f11537 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -112,7 +112,10 @@ static unsigned long bgpio_pin2mask(struct bgpio_chip *bgc, unsigned int pin) static unsigned long bgpio_pin2mask_be(struct bgpio_chip *bgc, unsigned int pin) { - return 1 << (bgc->bits - 1 - pin); + unsigned int bit = pin & 0x7; /* Bit number within byte */ + unsigned int base = pin - bit; /* Pin that is bit 0 within byte */ + + return 1 << ((bgc->bits - base - 8) + bit); /* shifted base + bit */ } static int bgpio_get(struct gpio_chip *gc, unsigned int gpio) -- 1.7.0.4
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