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| author | Andrew Chew <achew@nvidia.com> | 2013-07-26 13:39:53 -0700 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-08-16 15:04:40 +0200 |
| commit | 8b628c659ce1e2a8714ebcfe55f80457a4ebe734 (patch) | |
| tree | 05130f324a094949ee1a9b149ffe3b600877fe24 | |
| parent | 5763318f562fc0b30f729dce531b2982e29db463 (diff) | |
| download | linux-stable-8b628c659ce1e2a8714ebcfe55f80457a4ebe734.tar.gz linux-stable-8b628c659ce1e2a8714ebcfe55f80457a4ebe734.tar.bz2 linux-stable-8b628c659ce1e2a8714ebcfe55f80457a4ebe734.zip | |
gpio: palmas: Fix misreported GPIO out value
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>
| -rw-r--r-- | drivers/gpio/gpio-palmas.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-palmas.c b/drivers/gpio/gpio-palmas.c index 09360c4b6386..8588af0f7661 100644 --- a/drivers/gpio/gpio-palmas.c +++ b/drivers/gpio/gpio-palmas.c @@ -43,9 +43,22 @@ static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) unsigned int val; 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) { - 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 !!(val & BIT(offset)); |