diff options
| author | Philipp Zabel | 2015-06-12 18:20:35 +0200 |
|---|---|---|
| committer | Linus Walleij | 2015-07-16 00:11:02 +0200 |
| commit | db3b0fcc5adbda0c7060c9298c2514778547fee2 (patch) | |
| tree | 39e1ee04c0979833fc2cc09156857cfba9fd8c44 /drivers/gpio/gpio-generic.c | |
| parent | Linux 4.2-rc2 (diff) | |
| download | kernel-qcow2-linux-db3b0fcc5adbda0c7060c9298c2514778547fee2.tar.gz kernel-qcow2-linux-db3b0fcc5adbda0c7060c9298c2514778547fee2.tar.xz kernel-qcow2-linux-db3b0fcc5adbda0c7060c9298c2514778547fee2.zip | |
gpio: generic: add get_direction support
Allow to determine the current direction configuration by
reading back from the direction register.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-generic.c')
| -rw-r--r-- | drivers/gpio/gpio-generic.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index 9bda3727fac1..802e6d2c64e9 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -302,6 +302,14 @@ static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) return 0; } +static int bgpio_get_dir(struct gpio_chip *gc, unsigned int gpio) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + + return (bgc->read_reg(bgc->reg_dir) & bgc->pin2mask(bgc, gpio)) ? + GPIOF_DIR_OUT : GPIOF_DIR_IN; +} + static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) { struct bgpio_chip *bgc = to_bgpio_chip(gc); @@ -351,6 +359,14 @@ static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val) return 0; } +static int bgpio_get_dir_inv(struct gpio_chip *gc, unsigned int gpio) +{ + struct bgpio_chip *bgc = to_bgpio_chip(gc); + + return (bgc->read_reg(bgc->reg_dir) & bgc->pin2mask(bgc, gpio)) ? + GPIOF_DIR_IN : GPIOF_DIR_OUT; +} + static int bgpio_setup_accessors(struct device *dev, struct bgpio_chip *bgc, bool bit_be, @@ -468,10 +484,12 @@ static int bgpio_setup_direction(struct bgpio_chip *bgc, bgc->reg_dir = dirout; bgc->gc.direction_output = bgpio_dir_out; bgc->gc.direction_input = bgpio_dir_in; + bgc->gc.get_direction = bgpio_get_dir; } else if (dirin) { bgc->reg_dir = dirin; bgc->gc.direction_output = bgpio_dir_out_inv; bgc->gc.direction_input = bgpio_dir_in_inv; + bgc->gc.get_direction = bgpio_get_dir_inv; } else { bgc->gc.direction_output = bgpio_simple_dir_out; bgc->gc.direction_input = bgpio_simple_dir_in; |