msm: camera: Bypass redundant creation of video node in stereo

In stereo mode two sensors use one video node so we need
to bypass the creation of second one.

Change-Id: I4a16d664afd3d2f67ff13cb62cd8265144d64caf
Signed-off-by: Angel Hitov <ahitov@codeaurora.org>
Signed-off-by: Iliya Varadzhakov <ivarad@codeaurora.org>

drivers/media/platform/msm/camera_v2/sensor/msm_sensor.h

@@ -89,6 +89,7 @@ struct msm_sensor_ctrl_t {
 	uint32_t set_mclk_23880000;
 	uint8_t is_csid_tg_mode;
 	uint32_t is_secure;
+	uint8_t bypass_video_node_creation;
 };
 
 int msm_sensor_config(struct msm_sensor_ctrl_t *s_ctrl, void __user *argp);

drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c

@@ -86,11 +86,14 @@ static int32_t msm_sensor_driver_create_i2c_v4l_subdev
 	struct i2c_client *client = s_ctrl->sensor_i2c_client->client;
 
 	CDBG("%s %s I2c probe succeeded\n", __func__, client->name);
-	rc = camera_init_v4l2(&client->dev, &session_id);
-	if (rc < 0) {
-		pr_err("failed: camera_init_i2c_v4l2 rc %d", rc);
-		return rc;
+	if (s_ctrl->bypass_video_node_creation == 0) {
+		rc = camera_init_v4l2(&client->dev, &session_id);
+		if (rc < 0) {
+			pr_err("failed: camera_init_i2c_v4l2 rc %d", rc);
+			return rc;
+		}
 	}
+
 	CDBG("%s rc %d session_id %d\n", __func__, rc, session_id);
 	snprintf(s_ctrl->msm_sd.sd.name,
 		sizeof(s_ctrl->msm_sd.sd.name), "%s",
@@ -123,11 +126,14 @@ static int32_t msm_sensor_driver_create_v4l_subdev
 	int32_t rc = 0;
 	uint32_t session_id = 0;
 
-	rc = camera_init_v4l2(&s_ctrl->pdev->dev, &session_id);
-	if (rc < 0) {
-		pr_err("failed: camera_init_v4l2 rc %d", rc);
-		return rc;
+	if (s_ctrl->bypass_video_node_creation == 0) {
+		rc = camera_init_v4l2(&s_ctrl->pdev->dev, &session_id);
+		if (rc < 0) {
+			pr_err("failed: camera_init_v4l2 rc %d", rc);
+			return rc;
+		}
 	}
+
 	CDBG("rc %d session_id %d", rc, session_id);
 	s_ctrl->sensordata->sensor_info->session_id = session_id;
 
@@ -773,6 +779,8 @@ int32_t msm_sensor_driver_probe(void *setting,
 			slave_info32->sensor_init_params;
 		slave_info->output_format =
 			slave_info32->output_format;
+		slave_info->bypass_video_node_creation =
+			!!slave_info32->bypass_video_node_creation;
 		kfree(slave_info32);
 	} else
 #endif
@@ -800,7 +808,8 @@ int32_t msm_sensor_driver_probe(void *setting,
 		slave_info->sensor_init_params.position);
 	CDBG("mount %d",
 		slave_info->sensor_init_params.sensor_mount_angle);
-
+	CDBG("bypass video node creation %d",
+		slave_info->bypass_video_node_creation);
 	/* Validate camera id */
 	if (slave_info->camera_id >= MAX_CAMERAS) {
 		pr_err("failed: invalid camera id %d max %d",
@@ -980,6 +989,9 @@ CSID_TG:
 	 */
 	s_ctrl->is_probe_succeed = 1;
 
+	s_ctrl->bypass_video_node_creation =
+		slave_info->bypass_video_node_creation;
+
 	/*
 	 * Create /dev/videoX node, comment for now until dummy /dev/videoX
 	 * node is created and used by HAL

include/media/msm_cam_sensor.h

@@ -41,6 +41,7 @@ struct msm_camera_sensor_slave_info32 {
 	uint8_t  is_init_params_valid;
 	struct msm_sensor_init_params sensor_init_params;
 	enum msm_sensor_output_format_t output_format;
+	uint8_t bypass_video_node_creation;
 };
 
 struct msm_camera_csid_lut_params32 {

include/uapi/media/msm_camsensor_sdk.h

@@ -48,6 +48,8 @@
 #define MSM_EEPROM_MEMORY_MAP_MAX_SIZE  80
 #define MSM_EEPROM_MAX_MEM_MAP_CNT      8
 
+#define MSM_SENSOR_BYPASS_VIDEO_NODE    1
+
 enum msm_sensor_camera_id_t {
 	CAMERA_0,
 	CAMERA_1,
@@ -300,6 +302,7 @@ struct msm_camera_sensor_slave_info {
 	unsigned char  is_init_params_valid;
 	struct msm_sensor_init_params sensor_init_params;
 	enum msm_sensor_output_format_t output_format;
+	uint8_t bypass_video_node_creation;
 };
 
 struct msm_camera_i2c_reg_array {