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 --- drivers/gpio/pca953x_gpio.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpio/pca953x_gpio.c b/drivers/gpio/pca953x_gpio.c index 987d10e..3cbfa09 100644 --- a/drivers/gpio/pca953x_gpio.c +++ b/drivers/gpio/pca953x_gpio.c @@ -145,11 +145,13 @@ static int pca953x_get_value(struct udevice *dev, unsigned offset) int ret; u8 val = 0;
+ int off = offset % BANK_SZ; + ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset); if (ret) return ret;
- return (val >> offset) & 0x1; + return (val >> off) & 0x1; }
static int pca953x_set_value(struct udevice *dev, unsigned offset,