gpio: acpi: separation of concerns

The generic GPIO library directly implement code for acpi_find_gpio()
which is only used with CONFIG_ACPI. This was probably done because
OF did the same thing, but I removed that so remove this too.

Rename the internal acpi_find_gpio() in gpiolib-acpi.c to
acpi_populate_gpio_lookup() which seems to be more appropriate anyway
so as to avoid a namespace clash with the same function.

Make the stub return -ENOENT rather than -ENOSYS (as that is for
syscalls!).

For some reason the sunxi pin control driver was including the private
gpiolib header, it works just fine without it so remove that oneliner.

Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 54 insertions, 3 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index af514618d7fb..58ece201b8e6 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -14,6 +14,7 @@
 #include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
+#include <linux/gpio/machine.h>
 #include <linux/export.h>
 #include <linux/acpi.h>
 #include <linux/interrupt.h>
@@ -395,7 +396,7 @@ struct acpi_gpio_lookup {
 	int n;
 };
 
-static int acpi_find_gpio(struct acpi_resource *ares, void *data)
+static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
 {
 	struct acpi_gpio_lookup *lookup = data;
 
@@ -440,7 +441,8 @@ static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
 
 	INIT_LIST_HEAD(&res_list);
 
-	ret = acpi_dev_get_resources(lookup->adev, &res_list, acpi_find_gpio,
+	ret = acpi_dev_get_resources(lookup->adev, &res_list,
+				     acpi_populate_gpio_lookup,
 				     lookup);
 	if (ret < 0)
 		return ret;
@@ -513,7 +515,7 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
  * Note: if the GPIO resource has multiple entries in the pin list, this
  * function only returns the first.
  */
-struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
+static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
 					  const char *propname, int index,
 					  struct acpi_gpio_info *info)
 {
@@ -546,6 +548,55 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
 	return ret ? ERR_PTR(ret) : lookup.desc;
 }
 
+struct gpio_desc *acpi_find_gpio(struct device *dev,
+				 const char *con_id,
+				 unsigned int idx,
+				 enum gpiod_flags flags,
+				 enum gpio_lookup_flags *lookupflags)
+{
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+	struct acpi_gpio_info info;
+	struct gpio_desc *desc;
+	char propname[32];
+	int i;
+
+	/* Try first from _DSD */
+	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
+		if (con_id && strcmp(con_id, "gpios")) {
+			snprintf(propname, sizeof(propname), "%s-%s",
+				 con_id, gpio_suffixes[i]);
+		} else {
+			snprintf(propname, sizeof(propname), "%s",
+				 gpio_suffixes[i]);
+		}
+
+		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
+		if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
+			break;
+	}
+
+	/* Then from plain _CRS GPIOs */
+	if (IS_ERR(desc)) {
+		if (!acpi_can_fallback_to_crs(adev, con_id))
+			return ERR_PTR(-ENOENT);
+
+		desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
+		if (IS_ERR(desc))
+			return desc;
+
+		if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) &&
+		    info.gpioint) {
+			dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
+			return ERR_PTR(-ENOENT);
+		}
+	}
+
+	if (info.polarity == GPIO_ACTIVE_LOW)
+		*lookupflags |= GPIO_ACTIVE_LOW;
+
+	return desc;
+}
+
 /**
  * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
  * @fwnode: pointer to an ACPI firmware node to get the GPIO information from