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gpio: Fix error checking in the function device_pca957x_init 

This fixes error checking in the function device_pca957x_init
to properly check and return error code values from the calls
to the function pca953x_write_regs if they fail as to properly
signal callers when a error occurs due a failure when writing
registers for this gpio based device.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Nicholas Krause 2015-08-26 17:52:19 -04:00 committed by Linus Walleij
parent 49a5bd880c
commit c75a377204
1 changed files with 6 additions and 2 deletions
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8
drivers/gpio/gpio-pca953x.c
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@ -635,11 +635,15 @@ static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
memset(val, 0xFF, NBANK(chip));
else
memset(val, 0, NBANK(chip));
pca953x_write_regs(chip, PCA957X_INVRT, val);
ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
if (ret)
goto out;
/* To enable register 6, 7 to control pull up and pull down */
memset(val, 0x02, NBANK(chip));
pca953x_write_regs(chip, PCA957X_BKEN, val);
ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
if (ret)
goto out;
return 0;
out: