5 files changed, 112 insertions, 5 deletions

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index adf2588282fc..25f3b9cc8908 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -15,7 +15,6 @@
 #define pr_fmt(fmt) "%s: " fmt, __func__
 
 #include <linux/cdev.h>
-#include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/idr.h>
 #include <linux/module.h>
@@ -1040,6 +1039,39 @@ int tee_client_invoke_func(struct tee_context *ctx,
 }
 EXPORT_SYMBOL_GPL(tee_client_invoke_func);
 
+static int tee_client_device_match(struct device *dev,
+                                   struct device_driver *drv)
+{
+        const struct tee_client_device_id *id_table;
+        struct tee_client_device *tee_device;
+
+        id_table = to_tee_client_driver(drv)->id_table;
+        tee_device = to_tee_client_device(dev);
+
+        while (!uuid_is_null(&id_table->uuid)) {
+                if (uuid_equal(&tee_device->id.uuid, &id_table->uuid))
+                        return 1;
+                id_table++;
+        }
+
+        return 0;
+}
+
+static int tee_client_device_uevent(struct device *dev,
+                                    struct kobj_uevent_env *env)
+{
+        uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;
+
+        return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
+}
+
+struct bus_type tee_bus_type = {
+        .name           = "tee",
+        .match          = tee_client_device_match,
+        .uevent         = tee_client_device_uevent,
+};
+EXPORT_SYMBOL_GPL(tee_bus_type);
+
 static int __init tee_init(void)
 {
         int rc;
@@ -1053,18 +1085,32 @@ static int __init tee_init(void)
         rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
         if (rc) {
                 pr_err("failed to allocate char dev region\n");
-                class_destroy(tee_class);
-                tee_class = NULL;
+                goto out_unreg_class;
+        }
+
+        rc = bus_register(&tee_bus_type);
+        if (rc) {
+                pr_err("failed to register tee bus\n");
+                goto out_unreg_chrdev;
         }
 
+        return 0;
+
+out_unreg_chrdev:
+        unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
+out_unreg_class:
+        class_destroy(tee_class);
+        tee_class = NULL;
+
         return rc;
 }
 
 static void __exit tee_exit(void)
 {
+        bus_unregister(&tee_bus_type);
+        unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
         class_destroy(tee_class);
         tee_class = NULL;
-        unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
 }
 
 subsys_initcall(tee_init);
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index f9bd2f34b99f..14eaeeb46f41 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -779,4 +779,13 @@ struct typec_device_id {
         kernel_ulong_t driver_data;
 };
 
+/**
+ * struct tee_client_device_id - tee based device identifier
+ * @uuid: For TEE based client devices we use the device uuid as
+ *        the identifier.
+ */
+struct tee_client_device_id {
+        uuid_t uuid;
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index 5076502c07d7..56d7f1b4516d 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -15,11 +15,14 @@
 #ifndef __TEE_DRV_H
 #define __TEE_DRV_H
 
-#include <linux/types.h>
+#include <linux/device.h>
 #include <linux/idr.h>
 #include <linux/kref.h>
 #include <linux/list.h>
+#include <linux/mod_devicetable.h>
 #include <linux/tee.h>
+#include <linux/types.h>
+#include <linux/uuid.h>
 
 /*
  * The file describes the API provided by the generic TEE driver to the
@@ -544,4 +547,31 @@ static inline bool tee_param_is_memref(struct tee_param *param)
         }
 }
 
+extern struct bus_type tee_bus_type;
+
+/**
+ * struct tee_client_device - tee based device
+ * @id:                 device identifier
+ * @dev:                device structure
+ */
+struct tee_client_device {
+        struct tee_client_device_id id;
+        struct device dev;
+};
+
+#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev)
+
+/**
+ * struct tee_client_driver - tee client driver
+ * @id_table:           device id table supported by this driver
+ * @driver:             driver structure
+ */
+struct tee_client_driver {
+        const struct tee_client_device_id *id_table;
+        struct device_driver driver;
+};
+
+#define to_tee_client_driver(d) \
+                container_of(d, struct tee_client_driver, driver)
+
 #endif /*__TEE_DRV_H*/
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 293004499b4d..160718383a71 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -225,5 +225,8 @@ int main(void)
         DEVID_FIELD(typec_device_id, svid);
         DEVID_FIELD(typec_device_id, mode);
 
+        DEVID(tee_client_device_id);
+        DEVID_FIELD(tee_client_device_id, uuid);
+
         return 0;
 }
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index a37af7d71973..d0e41723627f 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -37,6 +37,9 @@ typedef unsigned char	__u8;
 typedef struct {
         __u8 b[16];
 } uuid_le;
+typedef struct {
+        __u8 b[16];
+} uuid_t;
 
 /* Big exception to the "don't include kernel headers into userspace, which
  * even potentially has different endianness and word sizes, since
@@ -1287,6 +1290,21 @@ static int do_typec_entry(const char *filename, void *symval, char *alias)
         return 1;
 }
 
+/* Looks like: tee:uuid */
+static int do_tee_entry(const char *filename, void *symval, char *alias)
+{
+        DEF_FIELD(symval, tee_client_device_id, uuid);
+
+        sprintf(alias, "tee:%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+                uuid.b[0], uuid.b[1], uuid.b[2], uuid.b[3], uuid.b[4],
+                uuid.b[5], uuid.b[6], uuid.b[7], uuid.b[8], uuid.b[9],
+                uuid.b[10], uuid.b[11], uuid.b[12], uuid.b[13], uuid.b[14],
+                uuid.b[15]);
+
+        add_wildcard(alias);
+        return 1;
+}
+
 /* Does namelen bytes of name exactly match the symbol? */
 static bool sym_is(const char *name, unsigned namelen, const char *symbol)
 {
@@ -1357,6 +1375,7 @@ static const struct devtable devtable[] = {
         {"fslmc", SIZE_fsl_mc_device_id, do_fsl_mc_entry},
         {"tbsvc", SIZE_tb_service_id, do_tbsvc_entry},
         {"typec", SIZE_typec_device_id, do_typec_entry},
+        {"tee", SIZE_tee_client_device_id, do_tee_entry},
 };
 
 /* Create MODULE_ALIAS() statements.