mei: bus: export client protocol version

export me client protocol version to sysfs and uevent

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 37 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-mei b/Documentation/ABI/testing/sysfs-bus-mei
index 20e4d1638bac..6bd45346ac7e 100644
--- a/Documentation/ABI/testing/sysfs-bus-mei
+++ b/Documentation/ABI/testing/sysfs-bus-mei
@@ -19,3 +19,10 @@ KernelVersion:	4.2
 Contact:        Tomas Winkler <tomas.winkler@intel.com>
 Description:    Stores mei client device uuid
                 Format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+
+What:           /sys/bus/mei/devices/.../version
+Date:           Aug 2015
+KernelVersion:  4.3
+Contact:        Tomas Winkler <tomas.winkler@intel.com>
+Description:    Stores mei client protocol version
+                Format: %d
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index e294f70741a0..d92017fa1630 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -590,6 +590,19 @@ static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
 }
 static DEVICE_ATTR_RO(uuid);
 
+static ssize_t version_show(struct device *dev, struct device_attribute *a,
+                             char *buf)
+{
+        struct mei_cl_device *cldev = to_mei_cl_device(dev);
+        u8 version = mei_me_cl_ver(cldev->me_cl);
+        size_t len;
+
+        len = snprintf(buf, PAGE_SIZE, "%02X", version);
+
+        return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
+}
+static DEVICE_ATTR_RO(version);
+
 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
                              char *buf)
 {
@@ -605,6 +618,7 @@ static DEVICE_ATTR_RO(modalias);
 static struct attribute *mei_cl_dev_attrs[] = {
         &dev_attr_name.attr,
         &dev_attr_uuid.attr,
+        &dev_attr_version.attr,
         &dev_attr_modalias.attr,
         NULL,
 };
@@ -622,6 +636,10 @@ static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         struct mei_cl_device *cldev = to_mei_cl_device(dev);
         const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
+        u8 version = mei_me_cl_ver(cldev->me_cl);
+
+        if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
+                return -ENOMEM;
 
         if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
                 return -ENOMEM;
diff --git a/drivers/misc/mei/client.h b/drivers/misc/mei/client.h
index 1c7cad07d731..04e1aa39243f 100644
--- a/drivers/misc/mei/client.h
+++ b/drivers/misc/mei/client.h
@@ -68,6 +68,18 @@ static inline const uuid_le *mei_me_cl_uuid(const struct mei_me_client *me_cl)
         return &me_cl->props.protocol_name;
 }
 
+/**
+ * mei_me_cl_ver - return me client protocol version
+ *
+ * @me_cl: me client
+ *
+ * Return: me client protocol version
+ */
+static inline u8 mei_me_cl_ver(const struct mei_me_client *me_cl)
+{
+        return me_cl->props.protocol_version;
+}
+
 /*
  * MEI IO Functions
  */