[PATCH v4 4/7] i2c: core: Make i2c_acpi_get_irq available to the rest of the I2C core

[Charles Keepax <ckeepax@opensource.cirrus.com>]

In preparation for more refactoring make i2c_acpi_get_irq available
outside i2c-core-acpi.c.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
---

Changes since v3:
 - Move the change to use the helper function from i2c-core-base into its own patch.

Thanks,
Charles

 drivers/i2c/i2c-core-acpi.c | 15 +++++++++++++--
 drivers/i2c/i2c-core.h      |  7 +++++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 7d4d66ba752d4..35966cc337dde 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -144,8 +144,17 @@ static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
 	return 1; /* No need to add resource to the list */
 }
 
-static int i2c_acpi_get_irq(struct acpi_device *adev)
+/**
+ * i2c_acpi_get_irq - get device IRQ number from ACPI
+ * @client: Pointer to the I2C client device
+ *
+ * Find the IRQ number used by a specific client device.
+ *
+ * Return: The IRQ number or an error code.
+ */
+int i2c_acpi_get_irq(struct i2c_client *client)
 {
+	struct acpi_device *adev = ACPI_COMPANION(&client->adapter->dev);
 	struct list_head resource_list;
 	int irq = -ENOENT;
 	int ret;
@@ -162,6 +171,8 @@ static int i2c_acpi_get_irq(struct acpi_device *adev)
 	return irq;
 }
 
+static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev);
+
 static int i2c_acpi_get_info(struct acpi_device *adev,
 			     struct i2c_board_info *info,
 			     struct i2c_adapter *adapter,
@@ -198,7 +209,7 @@ static int i2c_acpi_get_info(struct acpi_device *adev,
 		*adapter_handle = lookup.adapter_handle;
 
 	/* Then fill IRQ number if any */
-	ret = i2c_acpi_get_irq(adev);
+	ret = i2c_acpi_get_irq(i2c_acpi_find_client_by_adev(adev));
 	if (ret > 0)
 		info->irq = ret;
 
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
index 2a3b28bf826b1..517d98be68d25 100644
--- a/drivers/i2c/i2c-core.h
+++ b/drivers/i2c/i2c-core.h
@@ -63,6 +63,8 @@ const struct acpi_device_id *
 i2c_acpi_match_device(const struct acpi_device_id *matches,
 		      struct i2c_client *client);
 void i2c_acpi_register_devices(struct i2c_adapter *adap);
+
+int i2c_acpi_get_irq(struct i2c_client *client);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
 static inline const struct acpi_device_id *
@@ -71,6 +73,11 @@ i2c_acpi_match_device(const struct acpi_device_id *matches,
 {
 	return NULL;
 }
+
+static inline int i2c_acpi_get_irq(struct i2c_client *client)
+{
+	return 0;
+}
 #endif /* CONFIG_ACPI */
 extern struct notifier_block i2c_acpi_notifier;
 
-- 
2.11.0