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gpio: tegra: Implement gpio_get_direction callback

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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>
This commit is contained in:
Laxman Dewangan 2016-04-29 21:55:23 +05:30 committed by Linus Walleij
parent 72d3200061
commit f002d07c56
1 changed files with 16 additions and 0 deletions
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16
drivers/gpio/gpio-tegra.c
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@ -191,6 +191,21 @@ static int tegra_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
return 0; 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, static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset,
unsigned int debounce) unsigned int debounce)
{ {
@ -575,6 +590,7 @@ static int tegra_gpio_probe(struct platform_device *pdev)
tgi->gc.get = tegra_gpio_get; tgi->gc.get = tegra_gpio_get;
tgi->gc.direction_output = tegra_gpio_direction_output; tgi->gc.direction_output = tegra_gpio_direction_output;
tgi->gc.set = tegra_gpio_set; tgi->gc.set = tegra_gpio_set;
tgi->gc.get_direction = tegra_gpio_get_direction;
tgi->gc.to_irq = tegra_gpio_to_irq; tgi->gc.to_irq = tegra_gpio_to_irq;
tgi->gc.base = 0; tgi->gc.base = 0;
tgi->gc.ngpio = tgi->bank_count * 32; tgi->gc.ngpio = tgi->bank_count * 32;