[PATCH v1 7/7] gpiolib: acpi: Respect pin bias setting

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxxx>
---
 drivers/gpio/gpiolib-acpi.c | 12 ++++++++++++
 drivers/gpio/gpiolib.h      |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index a125e087689b..3db4643b1d4d 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/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(enum gpio_lookup_flags *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;
 
 		/*
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 3f95b423e590..d0e21ed0d05d 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -75,6 +75,7 @@ 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
@@ -83,6 +84,7 @@ struct acpi_gpio_info {
 	struct acpi_device *adev;
 	enum gpiod_flags flags;
 	bool gpioint;
+	int pin_config;
 	int polarity;
 	int triggering;
 	unsigned int quirks;
-- 
2.20.1