[PATCH] firmware: arm_ffa: Emit modalias for FF-A devices

[Sudeep Holla]

In order to enable libkmod lookups for FF-A device objects to their
corresponding module, add 'modalias' to the base attribute of FF-A
devices.

Cc: Abdellatif El Khlifi <abdellatif.elkhlifi at arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 drivers/firmware/arm_ffa/bus.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 7865438b3696..1c7940ba5539 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -15,6 +15,8 @@
 
 #include "common.h"
 
+#define SCMI_UEVENT_MODALIAS_FMT	"arm_ffa:%04x:%pUb"
+
 static DEFINE_IDA(ffa_bus_id);
 
 static int ffa_device_match(struct device *dev, struct device_driver *drv)
@@ -63,10 +65,20 @@ static int ffa_device_uevent(const struct device *dev, struct kobj_uevent_env *e
 {
 	const struct ffa_device *ffa_dev = to_ffa_dev(dev);
 
-	return add_uevent_var(env, "MODALIAS=arm_ffa:%04x:%pUb",
+	return add_uevent_var(env, "MODALIAS=" SCMI_UEVENT_MODALIAS_FMT,
 			      ffa_dev->vm_id, &ffa_dev->uuid);
 }
 
+static ssize_t modalias_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct ffa_device *ffa_dev = to_ffa_dev(dev);
+
+	return sysfs_emit(buf, SCMI_UEVENT_MODALIAS_FMT, ffa_dev->vm_id,
+			  &ffa_dev->uuid);
+}
+static DEVICE_ATTR_RO(modalias);
+
 static ssize_t partition_id_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -88,6 +100,7 @@ static DEVICE_ATTR_RO(uuid);
 static struct attribute *ffa_device_attributes_attrs[] = {
 	&dev_attr_partition_id.attr,
 	&dev_attr_uuid.attr,
+	&dev_attr_modalias.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(ffa_device_attributes);
-- 
2.42.0