+static int i2c_acpi_resource_count(struct acpi_resource *ares, void *data)
+{
+ struct acpi_resource_i2c_serialbus *sb;
+ int *count = data;
+
+ if (i2c_acpi_get_i2c_resource(ares, &sb))
+ *count = *count + 1;
+
+ return 1;
+}
+
+/**
+ * i2c_acpi_client_count - Count the number of I2cSerialBus resources
+ * @adev: ACPI device
+ *
+ * Returns the number of I2cSerialBus resources in the ACPI-device's
+ * resource-list; or a negative error code.
+ */
+int i2c_acpi_client_count(struct acpi_device *adev)
+{
+ int ret, count = 0;
+ LIST_HEAD(r);
+
+ ret = acpi_dev_get_resources(adev, &r, i2c_acpi_resource_count, &count);
+ if (ret < 0)
+ return ret;
+
+ acpi_dev_free_resource_list(&r);
+ return count;
+}
+EXPORT_SYMBOL_GPL(i2c_acpi_client_count);
+