gpio: tegra: Implement gpio_get_direction callback (f002d07c) · Commits · 戴 / test

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>

drivers/gpio/gpio-tegra.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -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;

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