[PATCH] media: ipu3-cio2: support multiple sensors and VCMs with HID name

[bingbu.cao@intel.com]

From: Bingbu Cao <bingbu.cao@intel.com>

In current cio2-bridge, it is using the hid as node name to register
software node and swnode will create kobject and sysfs entry with
the node name, if there are multiple sensors and VCMs which are sharing
same HID name, it will cause the software nodes registration failure:

[ 7.142311] sysfs: cannot create duplicate filename '/kernel/software_nodes/dw9714'
...
[ 7.142328] Call Trace:
[ 7.142330]  <TASK>
[ 7.142336]  dump_stack_lvl+0x49/0x63
[ 7.142341]  dump_stack+0x10/0x16
[ 7.142343]  sysfs_warn_dup.cold+0x17/0x2b
[ 7.142346]  sysfs_create_dir_ns+0xbc/0xd0
[ 7.142351]  kobject_add_internal+0xb1/0x2b0
[ 7.142356]  kobject_init_and_add+0x71/0xa0
[ 7.142360]  swnode_register+0x136/0x210
[ 7.142363]  software_node_register+0xd2/0x120
[ 7.142364]  software_node_register_nodes+0x83/0xf0
[ 7.142366]  ? acpi_get_physical_device_location+0x65/0xc0
[ 7.142371]  cio2_bridge_init+0x82a/0xb5e
...
[ 7.142448] kobject_add_internal failed for dw9714 with -EEXIST,
don't try to register things with the same name in the same directory.

One solution is appending the sensor link(Mipi Port) in SSDB as suffix
of the node name to fix this problem.

Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
---
 drivers/media/pci/intel/ipu3/cio2-bridge.c | 14 ++++++++++----
 drivers/media/pci/intel/ipu3/cio2-bridge.h |  2 +-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.c b/drivers/media/pci/intel/ipu3/cio2-bridge.c
index dfefe0d8aa95..1ce1acb18f3f 100644
--- a/drivers/media/pci/intel/ipu3/cio2-bridge.c
+++ b/drivers/media/pci/intel/ipu3/cio2-bridge.c
@@ -212,6 +212,7 @@ static void cio2_bridge_create_connection_swnodes(struct cio2_bridge *bridge,
 						  struct cio2_sensor *sensor)
 {
 	struct software_node *nodes = sensor->swnodes;
+	char vcm_name[ACPI_ID_LEN + 4];
 
 	cio2_bridge_init_swnode_names(sensor);
 
@@ -229,9 +230,12 @@ static void cio2_bridge_create_connection_swnodes(struct cio2_bridge *bridge,
 						sensor->node_names.endpoint,
 						&nodes[SWNODE_CIO2_PORT],
 						sensor->cio2_properties);
-	if (sensor->ssdb.vcmtype)
-		nodes[SWNODE_VCM] =
-			NODE_VCM(cio2_vcm_types[sensor->ssdb.vcmtype - 1]);
+	if (sensor->ssdb.vcmtype) {
+		scnprintf(vcm_name, sizeof(vcm_name), "%s-%u",
+			  cio2_vcm_types[sensor->ssdb.vcmtype - 1],
+			  sensor->ssdb.link);
+		nodes[SWNODE_VCM] = NODE_VCM(vcm_name);
+	}
 
 	cio2_bridge_init_swnode_group(sensor);
 }
@@ -295,7 +299,6 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 		}
 
 		sensor = &bridge->sensors[bridge->n_sensors];
-		strscpy(sensor->name, cfg->hid, sizeof(sensor->name));
 
 		ret = cio2_bridge_read_acpi_buffer(adev, "SSDB",
 						   &sensor->ssdb,
@@ -303,6 +306,9 @@ static int cio2_bridge_connect_sensor(const struct cio2_sensor_config *cfg,
 		if (ret)
 			goto err_put_adev;
 
+		scnprintf(sensor->name, sizeof(sensor->name), "%s-%u",
+			  cfg->hid, sensor->ssdb.link);
+
 		if (sensor->ssdb.vcmtype > ARRAY_SIZE(cio2_vcm_types)) {
 			dev_warn(&adev->dev, "Unknown VCM type %d\n",
 				 sensor->ssdb.vcmtype);
diff --git a/drivers/media/pci/intel/ipu3/cio2-bridge.h b/drivers/media/pci/intel/ipu3/cio2-bridge.h
index b93b749c65bd..820ff518ef2b 100644
--- a/drivers/media/pci/intel/ipu3/cio2-bridge.h
+++ b/drivers/media/pci/intel/ipu3/cio2-bridge.h
@@ -113,7 +113,7 @@ struct cio2_sensor_config {
 };
 
 struct cio2_sensor {
-	char name[ACPI_ID_LEN];
+	char name[ACPI_ID_LEN + 4];
 	struct acpi_device *adev;
 	struct i2c_client *vcm_i2c_client;
 
-- 
2.39.1