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Commit f002d07c authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Linus Walleij
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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: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Acked-by: default avatarJon Hunter <jonathanh@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 72d32000

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;