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authorLaxman Dewangan <ldewangan@nvidia.com>2016-04-29 19:25:23 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-04-30 14:15:10 +0300
commitf002d07c56c7b7007328e8fff2adf04db1c81e90 (patch)
tree3a9b90c61cf73f64934a4eee57d307aed179aebd /drivers/gpio/gpio-tegra.c
parent72d3200061776264941be1b5a9bb8e926b3b30a5 (diff)
downloadlinux-f002d07c56c7b7007328e8fff2adf04db1c81e90.tar.xz
gpio: tegra: Implement gpio_get_direction callback
Implement gpio_get_direction() callback for Tegra GPIO. The direction is only valid if the pin is configured as GPIO. If pin is not configured in GPIO mode then this function return error. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Acked-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-tegra.c')
-rw-r--r--drivers/gpio/gpio-tegra.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index b3ddd922290d..ec891a27952f 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -191,6 +191,21 @@ static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
return 0;
}
+static int tegra_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+ struct tegra_gpio_info *tgi = gpiochip_get_data(chip);
+ u32 pin_mask = BIT(GPIO_BIT(offset));
+ u32 cnf, oe;
+
+ cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset));
+ if (!(cnf & pin_mask))
+ return -EINVAL;
+
+ oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset));
+
+ return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN;
+}
+
static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
unsigned int debounce)
{
@@ -575,6 +590,7 @@ static int tegra_gpio_probe(struct platform_device *pdev)
tgi->gc.get = tegra_gpio_get;
tgi->gc.direction_output = tegra_gpio_direction_output;
tgi->gc.set = tegra_gpio_set;
+ tgi->gc.get_direction = tegra_gpio_get_direction;
tgi->gc.to_irq = tegra_gpio_to_irq;
tgi->gc.base = 0;
tgi->gc.ngpio = tgi->bank_count * 32;