linux-kernel - [PATCH v5 4/6] gpiolib: acpi: Add acpi_gpio_get_io

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Date:   Thu,  3 Jun 2021 23:40:05 +0100
From:   Daniel Scally <djrscally@...il.com>
To:     "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, devel@...ica.org
Cc:     Len Brown <lenb@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        laurent.pinchart@...asonboard.com, kieran.bingham@...asonboard.com
Subject: [PATCH v5 4/6] gpiolib: acpi: Add acpi_gpio_get_io_resource()

Add a function to verify that a given acpi_resource represents an IO
type GPIO resource, and return it if so.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Daniel Scally <djrscally@...il.com>
---
Changes since v4:
	- None

 drivers/gpio/gpiolib-acpi.c | 23 +++++++++++++++++++++++
 include/linux/acpi.h        |  7 +++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 684ddb35d83b..9887bb684575 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -196,6 +196,29 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 }
 EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
 
+/**
+ * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
+ *			       I/O resource or return False if not.
+ * @ares:	Pointer to the ACPI resource to fetch
+ * @agpio:	Pointer to a &struct acpi_resource_gpio to store the output pointer
+ */
+bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+			       struct acpi_resource_gpio **agpio)
+{
+	struct acpi_resource_gpio *gpio;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
+		return false;
+
+	gpio = &ares->data.gpio;
+	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
+		return false;
+
+	*agpio = gpio;
+	return true;
+}
+EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
+
 static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
 				      struct acpi_gpio_event *event)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 170b9bebdb2b..e8ba7063c000 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1098,6 +1098,8 @@ void __acpi_handle_debug(struct _ddebug *descriptor, acpi_handle handle, const c
 #if defined(CONFIG_ACPI) && defined(CONFIG_GPIOLIB)
 bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 				struct acpi_resource_gpio **agpio);
+bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+			       struct acpi_resource_gpio **agpio);
 int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int index);
 #else
 static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
@@ -1105,6 +1107,11 @@ static inline bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
 {
 	return false;
 }
+static inline bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
+					     struct acpi_resource_gpio **agpio)
+{
+	return false;
+}
 static inline int acpi_dev_gpio_irq_get_by(struct acpi_device *adev,
 					   const char *name, int index)
 {
-- 
2.25.1