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gpio: sa1100: implement get_direction method

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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>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Russell King 2016-08-31 08:49:44 +01:00 committed by Linus Walleij
parent 07242b2481
commit c65d1fd350
1 changed files with 8 additions and 0 deletions
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8
drivers/gpio/gpio-sa1100.c
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@ -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,