Messages in this thread Patch in this message | | | From | Laxman Dewangan <> | Subject | [PATCH V2] gpio: tegra: read output value when gpio is set in direction_out | Date | Fri, 9 Nov 2012 11:34:20 +0530 |
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Read the output value when gpio is set for the output mode for gpio_get_value(). Reading input value in direction out does not give correct value.
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> --- Changes from V1: - Keep the if part implementation same the else part to have implementation same kind.
drivers/gpio/gpio-tegra.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c index c7c175a..1163cf1 100644 --- a/drivers/gpio/gpio-tegra.c +++ b/drivers/gpio/gpio-tegra.c @@ -135,6 +135,11 @@ static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value) static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset) { + /* If gpio is in output mode then read from the out value */ + if ((tegra_gpio_readl(GPIO_OE(offset)) >> GPIO_BIT(offset)) & 1) + return (tegra_gpio_readl(GPIO_OUT(offset)) >> + GPIO_BIT(offset)) & 0x1; + return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1; } -- 1.7.1.1
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