pinctrl: bcm2835: Implement get_direction callback

Implement gpio_chip's get_direction() callback, that lets other
drivers get particular GPIOs direction using gpiod_get_direction().

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
index 08b1d93..57e7d21 100644 (file)
--- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c
+++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c
@@ -342,6 +342,18 @@ static int bcm2835_gpio_get(struct gpio_chip *chip, unsigned offset)
        return bcm2835_gpio_get_bit(pc, GPLEV0, offset);
 }
 
+static int bcm2835_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+       struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
+       enum bcm2835_fsel fsel = bcm2835_pinctrl_fsel_get(pc, offset);
+
+       /* Alternative function doesn't clearly provide a direction */
+       if (fsel > BCM2835_FSEL_GPIO_OUT)
+               return -EINVAL;
+
+       return (fsel == BCM2835_FSEL_GPIO_IN);
+}
+
 static void bcm2835_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
        struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
@@ -370,6 +382,7 @@ static struct gpio_chip bcm2835_gpio_chip = {
        .free = gpiochip_generic_free,
        .direction_input = bcm2835_gpio_direction_input,
        .direction_output = bcm2835_gpio_direction_output,
+       .get_direction = bcm2835_gpio_get_direction,
        .get = bcm2835_gpio_get,
        .set = bcm2835_gpio_set,
        .to_irq = bcm2835_gpio_to_irq,