From c65d1fd350fa28de79e86e18ef73b902a67c791a Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 31 Aug 2016 08:49:44 +0100 Subject: gpio: sa1100: implement get_direction method Allow gpiolib to read back the current IO direction configuration by implementing the .get_direction callback. This, in part, allows debugfs to report the complete true hardware state rather than the software state. Signed-off-by: Russell King Signed-off-by: Linus Walleij --- drivers/gpio/gpio-sa1100.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/gpio/gpio-sa1100.c b/drivers/gpio/gpio-sa1100.c index bad0169524c9..249f433aa62d 100644 --- a/drivers/gpio/gpio-sa1100.c +++ b/drivers/gpio/gpio-sa1100.c @@ -52,6 +52,13 @@ static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value) writel_relaxed(BIT(offset), sa1100_gpio_chip(chip)->membase + reg); } +static int sa1100_get_direction(struct gpio_chip *chip, unsigned offset) +{ + void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR; + + return !(readl_relaxed(gpdr) & BIT(offset)); +} + static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset) { void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR; @@ -85,6 +92,7 @@ static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset) static struct sa1100_gpio_chip sa1100_gpio_chip = { .chip = { .label = "gpio", + .get_direction = sa1100_get_direction, .direction_input = sa1100_direction_input, .direction_output = sa1100_direction_output, .set = sa1100_gpio_set, -- cgit v1.2.3