MLK-24795-4: mic: cosm: module autoprobing support for cosm drivers

Add uevent callback for cosm_bus and add cosm_device_id for cosm driver
which is needed for MODULE_DEVICE_TABLE.
Cosm driver will be autoloaded when cosm device appears.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>

drivers/misc/mic/bus/cosm_bus.c

@@ -14,6 +14,13 @@
 /* Unique numbering for cosm devices. */
 static DEFINE_IDA(cosm_index_ida);
 
+static int cosm_uevent(struct device *d, struct kobj_uevent_env *env)
+{
+	struct cosm_device *dev = dev_to_cosm(d);
+
+	return add_uevent_var(env, "MODALIAS=cosm:cosm-dev%u", dev->index);
+}
+
 static int cosm_dev_probe(struct device *d)
 {
 	struct cosm_device *dev = dev_to_cosm(d);
@@ -33,6 +40,7 @@ static int cosm_dev_remove(struct device *d)
 
 static struct bus_type cosm_bus = {
 	.name  = "cosm_bus",
+	.uevent = cosm_uevent,
 	.probe = cosm_dev_probe,
 	.remove = cosm_dev_remove,
 };

drivers/misc/mic/cosm/cosm_main.c

@@ -12,6 +12,7 @@
 #include <linux/idr.h>
 #include <linux/slab.h>
 #include <linux/cred.h>
+#include <linux/mod_devicetable.h>
 #include "cosm_main.h"
 
 static const char cosm_driver_name[] = "mic";
@@ -322,6 +323,12 @@ static int cosm_suspend(struct device *dev)
 	return 0;
 }
 
+static struct cosm_device_id __maybe_unused cosm_driver_id_table[] = {
+	{ .name	= "cosm-dev*" },
+	{ },
+};
+MODULE_DEVICE_TABLE(cosm, cosm_driver_id_table);
+
 static const struct dev_pm_ops cosm_pm_ops = {
 	.suspend = cosm_suspend,
 	.freeze = cosm_suspend

include/linux/mod_devicetable.h

@@ -834,4 +834,12 @@ struct vop_device_id {
 };
 #define VOP_DEV_ANY_ID	0xffffffff
 
+/* cosm */
+#define COSM_NAME_SIZE			32
+#define COSM_MODULE_PREFIX	"cosm:"
+
+struct cosm_device_id {
+	char name[COSM_NAME_SIZE];
+};
+
 #endif /* LINUX_MOD_DEVICETABLE_H */

scripts/mod/devicetable-offsets.c

@@ -235,5 +235,8 @@ int main(void)
 	DEVID_FIELD(vop_device_id, device);
 	DEVID_FIELD(vop_device_id, vendor);
 
+	DEVID(cosm_device_id);
+	DEVID_FIELD(cosm_device_id, name);
+
 	return 0;
 }

scripts/mod/file2alias.c

@@ -1350,6 +1350,16 @@ static int do_vop_entry(const char *filename, void *symval,
 	return 1;
 }
 
+/* Looks like: cosm:S */
+static int do_cosm_entry(const char *filename, void *symval,
+			  char *alias)
+{
+	DEF_FIELD_ADDR(symval, cosm_device_id, name);
+	sprintf(alias, COSM_MODULE_PREFIX "%s", *name);
+
+	return 1;
+}
+
 /* Does namelen bytes of name exactly match the symbol? */
 static bool sym_is(const char *name, unsigned namelen, const char *symbol)
 {
@@ -1423,6 +1433,7 @@ static const struct devtable devtable[] = {
 	{"tee", SIZE_tee_client_device_id, do_tee_entry},
 	{"wmi", SIZE_wmi_device_id, do_wmi_entry},
 	{"vop", SIZE_vop_device_id, do_vop_entry},
+	{"cosm", SIZE_cosm_device_id, do_cosm_entry},
 };
 
 /* Create MODULE_ALIAS() statements.