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| author | Stefan Wahren <stefan.wahren@i2se.com> | 2016-03-28 14:58:24 +0000 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-04-01 14:24:47 +0200 |
| commit | 20b3d2a79f0f9ff1ac189f43df7598d0e968210a (patch) | |
| tree | 69fadf5ef8b6b30ccd0ca3028d1f053ecefdb6fb | |
| parent | 42a44402ecb78e87eecf7ccad8099287e660ec36 (diff) | |
| download | lwn-20b3d2a79f0f9ff1ac189f43df7598d0e968210a.tar.gz lwn-20b3d2a79f0f9ff1ac189f43df7598d0e968210a.zip | |
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>
| -rw-r--r-- | drivers/pinctrl/bcm/pinctrl-bcm2835.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c index 08b1d93da9fe..57e7d21d526b 100644 --- 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, |