mei: bus: report also uuid in module alias

In order to automate modules matching add device uuid
which is reported in client enumeration, keep also
the name that is needed in for nfc distinguishing radio vendor

Report mei:name:uuid

Cc: linux-api@vger.kernel.org
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 36 insertions, 8 deletions

diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
index 1101d6efaf27..17b00baa53b1 100644
--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -30,23 +30,40 @@
 #define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
 #define to_mei_cl_device(d) container_of(d, struct mei_cl_device, dev)
 
+static inline uuid_le uuid_le_cast(const __u8 uuid[16])
+{
+	return *(uuid_le *)uuid;
+}
+
 static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
 {
 	struct mei_cl_device *device = to_mei_cl_device(dev);
 	struct mei_cl_driver *driver = to_mei_cl_driver(drv);
 	const struct mei_cl_device_id *id;
+	const uuid_le *uuid;
+	const char *name;
 
 	if (!device)
 		return 0;
 
+	uuid = mei_me_cl_uuid(device->me_cl);
+	name = device->name;
+
 	if (!driver || !driver->id_table)
 		return 0;
 
 	id = driver->id_table;
 
-	while (id->name[0]) {
-		if (!strncmp(dev_name(dev), id->name, sizeof(id->name)))
-			return 1;
+	while (uuid_le_cmp(NULL_UUID_LE, uuid_le_cast(id->uuid))) {
+
+		if (!uuid_le_cmp(*uuid, uuid_le_cast(id->uuid))) {
+			if (id->name[0]) {
+				if (!strncmp(name, id->name, sizeof(id->name)))
+					return 1;
+			} else {
+				return 1;
+			}
+		}
 
 		id++;
 	}
@@ -69,7 +86,7 @@ static int mei_cl_device_probe(struct device *dev)
 
 	dev_dbg(dev, "Device probe\n");
 
-	strlcpy(id.name, dev_name(dev), sizeof(id.name));
+	strlcpy(id.name, device->name, sizeof(id.name));
 
 	return driver->probe(device, &id);
 }
@@ -100,9 +117,12 @@ static int mei_cl_device_remove(struct device *dev)
 static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
 			     char *buf)
 {
-	int len;
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
+	size_t len;
 
-	len = snprintf(buf, PAGE_SIZE, "mei:%s\n", dev_name(dev));
+	len = snprintf(buf, PAGE_SIZE, "mei:%s:" MEI_CL_UUID_FMT ":",
+		device->name, MEI_CL_UUID_ARGS(uuid->b));
 
 	return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
 }
@@ -116,7 +136,11 @@ ATTRIBUTE_GROUPS(mei_cl_dev);
 
 static int mei_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
-	if (add_uevent_var(env, "MODALIAS=mei:%s", dev_name(dev)))
+	struct mei_cl_device *device = to_mei_cl_device(dev);
+	const uuid_le *uuid = mei_me_cl_uuid(device->me_cl);
+
+	if (add_uevent_var(env, "MODALIAS=mei:%s:" MEI_CL_UUID_FMT ":",
+		device->name, MEI_CL_UUID_ARGS(uuid->b)))
 		return -ENOMEM;
 
 	return 0;
@@ -185,7 +209,9 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
 	device->dev.bus = &mei_cl_bus_type;
 	device->dev.type = &mei_cl_device_type;
 
-	dev_set_name(&device->dev, "%s", name);
+	strlcpy(device->name, name, sizeof(device->name));
+
+	dev_set_name(&device->dev, "mei:%s:%pUl", name, mei_me_cl_uuid(me_cl));
 
 	status = device_register(&device->dev);
 	if (status) {
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index 79ab78184523..ab719e674edf 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -376,6 +376,7 @@ struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev, uuid_le uuid);
  * @dev: linux driver model device pointer
  * @me_cl: me client
  * @cl: mei client
+ * @name: device name
  * @ops: ME transport ops
  * @event_work: async work to execute event callback
  * @event_cb: Drivers register this callback to get asynchronous ME
@@ -389,6 +390,7 @@ struct mei_cl_device {
 
 	struct mei_me_client *me_cl;
 	struct mei_cl *cl;
+	char name[MEI_CL_NAME_SIZE];
 
 	const struct mei_cl_ops *ops;