i2c: acpi: Add i2c_acpi_new_device_by_fwnode() function

Change i2c_acpi_new_device() into i2c_acpi_new_device_by_fwnode() and
add a static inline wrapper providing the old i2c_acpi_new_device()
behavior.

This is necessary because in some cases we may only have access
to the fwnode / acpi_device and not to the matching physical-node
struct device *.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20211203102857.44539-4-hdegoede@redhat.com

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 04338cbd08a9aa51325c4a2795ad812ac1ff624b..c87ce22760075a32449b9cb9e8b6ee3ae84438a6 100644 (file)
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -476,8 +476,8 @@ struct notifier_block i2c_acpi_notifier = {
 };
 
 /**
- * i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
- * @dev:     Device owning the ACPI resources to get the client from
+ * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource
+ * @fwnode:  fwnode with the ACPI resources to get the client from
  * @index:   Index of ACPI resource to get
  * @info:    describes the I2C device; note this is modified (addr gets set)
  * Context: can sleep
@@ -493,15 +493,20 @@ struct notifier_block i2c_acpi_notifier = {
  * Returns a pointer to the new i2c-client, or error pointer in case of failure.
  * Specifically, -EPROBE_DEFER is returned if the adapter is not found.
  */
-struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
-                                      struct i2c_board_info *info)
+struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
+                                                int index,
+                                                struct i2c_board_info *info)
 {
-       struct acpi_device *adev = ACPI_COMPANION(dev);
        struct i2c_acpi_lookup lookup;
        struct i2c_adapter *adapter;
+       struct acpi_device *adev;
        LIST_HEAD(resource_list);
        int ret;
 
+       adev = to_acpi_device_node(fwnode);
+       if (!adev)
+               return ERR_PTR(-ENODEV);
+
        memset(&lookup, 0, sizeof(lookup));
        lookup.info = info;
        lookup.device_handle = acpi_device_handle(adev);
@@ -523,7 +528,7 @@ struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
 
        return i2c_new_client_device(adapter, info);
 }
-EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
+EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode);
 
 bool i2c_acpi_waive_d0_probe(struct device *dev)
 {

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 16119ac1aa97ebdf6a2c59952eafca847bb6e324..7d4f52ceb7b547b8d485fa4e4de639df1acb579e 100644 (file)
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -1025,8 +1025,9 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
                               struct acpi_resource_i2c_serialbus **i2c);
 int i2c_acpi_client_count(struct acpi_device *adev);
 u32 i2c_acpi_find_bus_speed(struct device *dev);
-struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
-                                      struct i2c_board_info *info);
+struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
+                                                int index,
+                                                struct i2c_board_info *info);
 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
 bool i2c_acpi_waive_d0_probe(struct device *dev);
 #else
@@ -1043,8 +1044,9 @@ static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
 {
        return 0;
 }
-static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
-                                       int index, struct i2c_board_info *info)
+static inline struct i2c_client *i2c_acpi_new_device_by_fwnode(
+                                       struct fwnode_handle *fwnode, int index,
+                                       struct i2c_board_info *info)
 {
        return ERR_PTR(-ENODEV);
 }
@@ -1058,4 +1060,11 @@ static inline bool i2c_acpi_waive_d0_probe(struct device *dev)
 }
 #endif /* CONFIG_ACPI */
 
+static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
+                                                    int index,
+                                                    struct i2c_board_info *info)
+{
+       return i2c_acpi_new_device_by_fwnode(dev_fwnode(dev), index, info);
+}
+
 #endif /* _LINUX_I2C_H */