Messages in this thread Patch in this message | | | From | Philipp Zabel <> | Subject | [PATCH] gpio: generic: add get_direction support | Date | Fri, 12 Jun 2015 18:20:35 +0200 |
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Allow to determine the current direction configuration by reading back from the direction register.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> --- drivers/gpio/gpio-generic.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c index b92a690..fb9c572 100644 --- a/drivers/gpio/gpio-generic.c +++ b/drivers/gpio/gpio-generic.c @@ -291,6 +291,14 @@ 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); @@ -340,6 +348,14 @@ 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, @@ -452,10 +468,12 @@ 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; -- 2.1.4
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