[PATCH v4 1/8] platform/x86: wmi: move struct wmi_device_id to mod_devicetable.h

[Mattias Jacobsson]

In preparation for adding WMI support to MODULE_DEVICE_TABLE() move the
definition of struct wmi_device_id to mod_devicetable.h and inline
guid_string in the struct.

Changing guid_string to an inline char array changes the loop conditions
when looping over an array of struct wmi_device_id. Therefore update
wmi_dev_match()'s loop to check for an empty guid_string instead of a
NULL pointer.

Signed-off-by: Mattias Jacobsson <2...@mok.nu>
---
 drivers/platform/x86/wmi.c      |  2 +-
 include/linux/mod_devicetable.h | 12 ++++++++++++
 include/linux/wmi.h             |  5 +----
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index b0f3d8ecd898..7b26b6ccf1a0 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -771,7 +771,7 @@ static int wmi_dev_match(struct device *dev, struct 
device_driver *driver)
        if (id == NULL)
                return 0;
 
-       while (id->guid_string) {
+       while (*id->guid_string) {
                uuid_le driver_guid;
 
                if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index f9bd2f34b99f..e44b90fa0aef 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -779,4 +779,16 @@ struct typec_device_id {
        kernel_ulong_t driver_data;
 };
 
+/* WMI */
+
+#define WMI_MODULE_PREFIX      "wmi:"
+
+/**
+ * struct wmi_device_id - WMI device identifier
+ * @guid_string: 36 char string of the form 
fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ */
+struct wmi_device_id {
+       const char guid_string[UUID_STRING_LEN+1];
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/include/linux/wmi.h b/include/linux/wmi.h
index 4757cb5077e5..592f81afecbb 100644
--- a/include/linux/wmi.h
+++ b/include/linux/wmi.h
@@ -18,6 +18,7 @@
 
 #include <linux/device.h>
 #include <linux/acpi.h>
+#include <linux/mod_devicetable.h>
 #include <uapi/linux/wmi.h>
 
 struct wmi_device {
@@ -39,10 +40,6 @@ extern union acpi_object *wmidev_block_query(struct 
wmi_device *wdev,
 
 extern int set_required_buffer_size(struct wmi_device *wdev, u64 length);
 
-struct wmi_device_id {
-       const char *guid_string;
-};
-
 struct wmi_driver {
        struct device_driver driver;
        const struct wmi_device_id *id_table;
-- 
2.20.1