[PATCH 04/33] gpio: sa1100: implement get_direction method

Russell King
2016-08-29T10:24:25Z

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 <rmk+kernel@armlinux.org.uk>
---
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,
--
2.1.0