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gpio: palmas: Fix misreported GPIO out value

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It seems that the value read back from the PALMAS_GPIO_DATA_IN register
isn't valid if the GPIO direction is out.  When that's the case, we can
read back the PALMAS_GPIO_DATA_OUT register to get the proper output value.

Signed-off-by: Andrew Chew <achew@nvidia.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Andrew Chew 2013-07-26 13:39:53 -07:00 • committed by Linus Walleij
parent 5763318f56
commit 8b628c659c
1 changed files with 15 additions and 2 deletions
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17
drivers/gpio/gpio-palmas.c
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@ -43,9 +43,22 @@ static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
unsigned int val; unsigned int val;
int ret; int ret;
ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_IN, &val); ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_DIR, &val);
if (ret < 0) { if (ret < 0) {
dev_err(gc->dev, "GPIO_DATA_IN read failed, err = %d\n", ret); dev_err(gc->dev, "GPIO_DATA_DIR read failed, err = %d\n", ret);
return ret;
}
if (val & (1 << offset)) {
ret = palmas_read(palmas, PALMAS_GPIO_BASE,
PALMAS_GPIO_DATA_OUT, &val);
} else {
ret = palmas_read(palmas, PALMAS_GPIO_BASE,
PALMAS_GPIO_DATA_IN, &val);
}
if (ret < 0) {
dev_err(gc->dev, "GPIO_DATA_IN/OUT read failed, err = %d\n",
ret);
return ret; return ret;
} }
return !!(val & BIT(offset)); return !!(val & BIT(offset));