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From:   Daniel Scally <djrscally@gmail.com>
To:     "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Daniel Scally <djrscally@gmail.com>,
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        Maximilian Luz <luzmaximilian@gmail.com>,
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        linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
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        devel@acpica.org
Cc:     Len Brown <lenb@kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Russell King <linux@armlinux.org.uk>,
        Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
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Subject: [PATCH v4 6/8] gpiolib: acpi: Add acpi_gpio_get_io_resource()
Date:   Thu, 20 May 2021 15:09:26 +0100
Message-Id: <20210520140928.3252671-7-djrscally@gmail.com>
In-Reply-To: <20210520140928.3252671-1-djrscally@gmail.com>
References: <20210520140928.3252671-1-djrscally@gmail.com>
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Add a function to verify that a given acpi_resource represents an IO
type GPIO resource, and return it if so.

Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
Changes since v3:
	- Patch introduced

 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