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gpio: pca953x: Fix register reading past 8th GPIO

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A bug in the pca953x driver prevents correct reading of GPIO input
values beyond the 8th GPIO; all values are reported as zero. Setting of
GPIO output values is not affected.

This patch fixes the reading behavior.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Peng Fan <van.freenix@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
mario.six@gdsys.cc 2016-05-23 09:54:56 +02:00 • committed by Simon Glass
parent 5aeedebc33
commit fc76b69873
1 changed files with 3 additions and 1 deletions
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4
drivers/gpio/pca953x_gpio.c
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@ -148,11 +148,13 @@ static int pca953x_get_value(struct udevice *dev, unsigned offset)
int ret; int ret;
u8 val = 0; u8 val = 0;
int off = offset % BANK_SZ;
ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset); ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset);
if (ret) if (ret)
return ret; return ret;
return (val >> offset) & 0x1; return (val >> off) & 0x1;
} }
static int pca953x_set_value(struct udevice *dev, unsigned offset, static int pca953x_set_value(struct udevice *dev, unsigned offset,