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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>
This commit is contained in:
Philipp Zabel 2015-06-12 18:20:35 +02:00 committed by Linus Walleij
parent bc0195aad0
commit db3b0fcc5a
1 changed files with 18 additions and 0 deletions
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18
drivers/gpio/gpio-generic.c
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@ -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;