Currently there is no easy way to associate driver data kind of thing
with wmi drivers thus global variables have to be used to pass that
information between functions. Add a pair of functions to support
that.
Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx>
---
drivers/platform/x86/wmi.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 2 ++
2 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 39ec5b6..706e58f 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -68,6 +68,7 @@ struct wmi_block {
wmi_notify_handler handler;
void *handler_data;
struct device *dev;
+ void *driver_data;
};
static struct wmi_block wmi_blocks;
@@ -583,6 +584,49 @@ bool wmi_has_guid(const char *guid_string)
}
EXPORT_SYMBOL_GPL(wmi_has_guid);
+/**
+ * wmi_set_driver_data
+ * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @data: Driver specific data
+ *
+ * Set driver specific data
+ */
+acpi_status wmi_set_driver_data(const char *guid, void *data)
+{
+ struct wmi_block *wblock;
+
+ if (!guid)
+ return AE_BAD_PARAMETER;
+
+ if (!find_guid(guid, &wblock))
+ return AE_NOT_EXIST;
+
+ wblock->driver_data = data;
+
+ return AE_OK;
+}
+EXPORT_SYMBOL_GPL(wmi_set_driver_data);
+
+/**
+ * wmi_get_driver_data
+ * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ *
+ * Get driver specific data
+ */
+void *wmi_get_driver_data(const char *guid)
+{
+ struct wmi_block *wblock;
+
+ if (!guid)
+ return NULL;
+
+ if (!find_guid(guid, &wblock))
+ return NULL;
+
+ return wblock->driver_data;
+}
+EXPORT_SYMBOL_GPL(wmi_get_driver_data);
+
/*
* sysfs interface
*/
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index b926afe..e56e5e2 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -169,6 +169,8 @@ extern acpi_status wmi_install_notify_handler(const char *guid,
extern acpi_status wmi_remove_notify_handler(const char *guid);
extern acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out);
extern bool wmi_has_guid(const char *guid);
+extern acpi_status wmi_set_driver_data(const char *guid, void *data);
+extern void *wmi_get_driver_data(const char *guid);
#endif /* CONFIG_ACPI_WMI */
--
1.5.5.1
--
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