diff options
| author | Laxman Dewangan <ldewangan@nvidia.com> | 2016-04-29 18:25:23 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-04-30 13:15:10 +0200 |
| commit | f002d07c56c7b7007328e8fff2adf04db1c81e90 (patch) | |
| tree | 3a9b90c61cf73f64934a4eee57d307aed179aebd /drivers/gpio | |
| parent | gpio: set up initial state from .get_direction() (diff) | |
| download | linux-f002d07c56c7b7007328e8fff2adf04db1c81e90.tar.xz linux-f002d07c56c7b7007328e8fff2adf04db1c81e90.zip | |
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')
| -rw-r--r-- | drivers/gpio/gpio-tegra.c | 16 |
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; |