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path: root/drivers/gpio/gpio-generic.c
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Diffstat (limited to 'drivers/gpio/gpio-generic.c')
-rw-r--r--drivers/gpio/gpio-generic.c41
1 files changed, 38 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
index 9bda3727fac1..a3f07537fe62 100644
--- a/drivers/gpio/gpio-generic.c
+++ b/drivers/gpio/gpio-generic.c
@@ -153,6 +153,10 @@ static int bgpio_get(struct gpio_chip *gc, unsigned int gpio)
return !!(bgc->read_reg(bgc->reg_dat) & bgc->pin2mask(bgc, gpio));
}
+static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val)
+{
+}
+
static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
{
struct bgpio_chip *bgc = to_bgpio_chip(gc);
@@ -279,6 +283,12 @@ static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio)
return 0;
}
+static int bgpio_dir_out_err(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ return -EINVAL;
+}
+
static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio,
int val)
{
@@ -302,6 +312,14 @@ 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 +369,14 @@ 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,
@@ -444,6 +470,9 @@ static int bgpio_setup_io(struct bgpio_chip *bgc,
bgc->reg_set = set;
bgc->gc.set = bgpio_set_set;
bgc->gc.set_multiple = bgpio_set_multiple_set;
+ } else if (flags & BGPIOF_NO_OUTPUT) {
+ bgc->gc.set = bgpio_set_none;
+ bgc->gc.set_multiple = NULL;
} else {
bgc->gc.set = bgpio_set;
bgc->gc.set_multiple = bgpio_set_multiple;
@@ -460,7 +489,8 @@ static int bgpio_setup_io(struct bgpio_chip *bgc,
static int bgpio_setup_direction(struct bgpio_chip *bgc,
void __iomem *dirout,
- void __iomem *dirin)
+ void __iomem *dirin,
+ unsigned long flags)
{
if (dirout && dirin) {
return -EINVAL;
@@ -468,12 +498,17 @@ 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;
+ if (flags & BGPIOF_NO_OUTPUT)
+ bgc->gc.direction_output = bgpio_dir_out_err;
+ else
+ bgc->gc.direction_output = bgpio_simple_dir_out;
bgc->gc.direction_input = bgpio_simple_dir_in;
}
@@ -525,7 +560,7 @@ int bgpio_init(struct bgpio_chip *bgc, struct device *dev,
if (ret)
return ret;
- ret = bgpio_setup_direction(bgc, dirout, dirin);
+ ret = bgpio_setup_direction(bgc, dirout, dirin, flags);
if (ret)
return ret;