diff options
| author | Baruch Siach <baruch@tkos.co.il> | 2019-01-10 13:26:21 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2019-01-10 16:19:11 +0100 |
| commit | e8dacf5957ea583c2a1f48600043a6f76e340d1e (patch) | |
| tree | 3eaaa16bb1e8cbcf4be122576ed586991b62a8ee | |
| parent | Linux 5.0-rc1 (diff) | |
| download | linux-e8dacf5957ea583c2a1f48600043a6f76e340d1e.tar.xz linux-e8dacf5957ea583c2a1f48600043a6f76e340d1e.zip | |
gpio: mvebu: implement get_direction
struct gpio_chip documentation recommends to always implement this
callback function.
A more concrete motivation is to be able (in combination with
GPIOD_ASIS) to detect whether the bootloader has changed the state of a
GPIO signal.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-mvebu.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index 7d5c55494ccd..f97ed32b8beb 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -376,6 +376,16 @@ static int mvebu_gpio_direction_output(struct gpio_chip *chip, unsigned int pin, return 0; } +static int mvebu_gpio_get_direction(struct gpio_chip *chip, unsigned int pin) +{ + struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); + u32 u; + + regmap_read(mvchip->regs, GPIO_IO_CONF_OFF + mvchip->offset, &u); + + return !!(u & BIT(pin)); +} + static int mvebu_gpio_to_irq(struct gpio_chip *chip, unsigned int pin) { struct mvebu_gpio_chip *mvchip = gpiochip_get_data(chip); @@ -1130,6 +1140,7 @@ static int mvebu_gpio_probe(struct platform_device *pdev) mvchip->chip.parent = &pdev->dev; mvchip->chip.request = gpiochip_generic_request; mvchip->chip.free = gpiochip_generic_free; + mvchip->chip.get_direction = mvebu_gpio_get_direction; mvchip->chip.direction_input = mvebu_gpio_direction_input; mvchip->chip.get = mvebu_gpio_get; mvchip->chip.direction_output = mvebu_gpio_direction_output; |