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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2016-08-31 08:49:44 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-03-24 14:04:37 +0100 |
| commit | c65d1fd350fa28de79e86e18ef73b902a67c791a (patch) | |
| tree | a9af6c70bb9fb1f784bb73e2912836c4237e6807 | |
| parent | 07242b248119a9388a67975aa7fae7c23afc7a07 (diff) | |
| download | linux-c65d1fd350fa28de79e86e18ef73b902a67c791a.tar.gz linux-c65d1fd350fa28de79e86e18ef73b902a67c791a.tar.bz2 linux-c65d1fd350fa28de79e86e18ef73b902a67c791a.zip | |
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 <rmk+kernel@armlinux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpio-sa1100.c | 8 |
1 files changed, 8 insertions, 0 deletions
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, |