gpiolib: acpi: Respect pin bias setting

For now, we don't take into account the pin bias settings supplied by ACPI.
This change is targeting the mentioned gap.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-acpi.c

@@ -528,6 +528,17 @@ acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *inf
 int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
 					struct acpi_gpio_info *info)
 {
+	switch (info->pin_config) {
+	case ACPI_PIN_CONFIG_PULLUP:
+		*lookupflags |= GPIO_PULL_UP;
+		break;
+	case ACPI_PIN_CONFIG_PULLDOWN:
+		*lookupflags |= GPIO_PULL_DOWN;
+		break;
+	default:
+		break;
+	}
+
 	if (info->polarity == GPIO_ACTIVE_LOW)
 		*lookupflags |= GPIO_ACTIVE_LOW;
 
@@ -567,6 +578,7 @@ static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 
 		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
 					      agpio->pin_table[pin_index]);
+		lookup->info.pin_config = agpio->pin_config;
 		lookup->info.gpioint = gpioint;
 
 		/*

drivers/gpio/gpiolib.h

@@ -74,6 +74,7 @@ struct gpio_device {
  * @adev: reference to ACPI device which consumes GPIO resource
  * @flags: GPIO initialization flags
  * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
+ * @pin_config: pin bias as provided by ACPI
  * @polarity: interrupt polarity as provided by ACPI
  * @triggering: triggering type as provided by ACPI
  * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
@@ -82,6 +83,7 @@ struct acpi_gpio_info {
 	struct acpi_device *adev;
 	enum gpiod_flags flags;
 	bool gpioint;
+	int pin_config;
 	int polarity;
 	int triggering;
 	unsigned int quirks;