一、目标
本文主要目标是，支持前置摄像头0v5648、后置摄像头ov13850，以及移植过程遇到的一些小问题的解决。
1. 摄像头连接图
参考上图，摄像头详细信息如下：
- 2个摄像头均连接在I2C通道4
- 2个摄像头共用同一个MIPI数据通道
- 2个摄像头各自有独立的rst、pwdn引脚
- rkw提供的sdk中已经提供camera时钟的设备树信息，此处选择对应时钟即可
- ov13850用到4个lane，0v5648用到2个lane
- 摄像头的片选通过select-gpios来选择，拉低选择0v13850,拉高选择ov5684
三、设备树
根据上述摄像头硬件信息，设备树信息如下：
- reg：该模块输入端点序号
- remot-endpoint ：输出端点的名字，在下面设备树信息中列举出来
- data-lanes ：数据通道信息
在这里插入图片描述
四、驱动
rxw sdk中已经有这两个摄像头的驱动，但是需要增加片选的逻辑，
根据前面文章，
可知开启和关闭摄像头视频流通过以下命令：
VIDIOC_STREAMON， VIDIOC_STREAMOFF对应的回调函数
static int ov5648_s_stream(struct v4l2_subdev *sd, int on)除此之外，power控制的回调函数
static int ov5648_s_power(struct v4l2_subdev *sd, int on)我们只需要在这对应的回调函数中增加select-gpio的操作即可。
所有修改代码如下：
+#include <linux/gpio.h>+#include <linux/of_gpio.h>+static int select_gpios;//前置摄像头使能static int ov5648_s_stream(struct v4l2_subdev *sd, int on){ …… if (on) {+ gpio_direction_output(select_gpios, 1);+ usleep_range(1000, 2000); …… } else { ……+ gpio_direction_output(select_gpios, 0);+ usleep_range(1000, 2000); } ……}static int ov5648_s_power(struct v4l2_subdev *sd, int on){ …… if (on) {+ gpio_direction_output(select_gpios, 1);+ usleep_range(1000, 2000); …… } else {+ gpio_direction_output(select_gpios, 0); …… } ……}static void __ov5648_power_off(struct ov5648 *ov5648){ int ret; struct device *dev = &ov5648->client->dev;+ gpio_direction_output(select_gpios, 0); ……}static int ov5648_probe(struct i2c_client *client, ……+ struct device_node *np;++ np = dev->of_node; ……+ select_gpios = of_get_named_gpio(np, "select-gpios", 0);++ ret = gpio_request(select_gpios, "select-gpios");+ if (ret < 0) {+ dev_err(dev,"Failed to request GPIO:%d, ERRNO:%d", (s32) select_gpios, ret);+ //return ret;+ }+ printk("ov5648 select_gpios=%d",select_gpios); ……五、拓扑结构
加载成功后查看拓扑结构，会有以下entity 信息：
- entity 70: m01_f_ov5648 4-0036 (1 pad, 1 link) type V4L2 subdev subtype Sensor device node name /dev/v4l-subdev3 pad0: Source [fmt:SBGGR10/2592x1944] -> "rockchip-csi2-dphy0":0 []- entity 74: m00_b_ov13850 4-0010 (1 pad, 1 link) type V4L2 subdev subtype Sensor device node name /dev/v4l-subdev4 pad0: Source [fmt:SBGGR10/4224x3136] -> "rockchip-csi2-dphy0":0 [ENABLED]说明pipe通路ok。
六、xml配置文件
要让安卓识别前后置摄像头，还需要在以下文件增加后置摄像头ov13850、前置摄像头ov5684信息
@hardware/rockchip/camera/etc/camera/camera3_profiles.xml@hardware/rockchip/camera/etc/camera/camera3_profiles_rk356x.xml在这两个xml文件中增加这两个摄像头信息即可，
一口君是按照其他摄像头内容修改的，
ov5684因为分辨率问题，需要注意不要超过最大值。
获取xml文件，可以后台回复：rxw
七、切换后，前置摄像头打不开bug
开机后用命令抓帧，用的是前置摄像头
打开app后，界面显示的是后置摄像头信息
但是点解界面的切换按钮，获取不到前置摄像头图像，
在不重启的情况下要操作后置摄像头，执行下面操作即可。
Settings->apps¬ificationsSEE ALL 16 APPS选择最近应用 CameraStorage&cache 点击 clear storage 然后退出重新打开摄像头APP即可1. 错误分析
- 首先在ov5648驱动的加上log
static int ov5648_s_stream(struct v4l2_subdev *sd, int on){ …… on = !!on; printk("6902 %s(%d) enter! %d\n", __func__, __LINE__,on); if (on == ov5648->streaming) goto unlock_and_return; if (on) { …… } else { …… } ov5648->streaming = on;}发现切换的时候没有执行该函数，所以定位是APP测出了问题
2. 查看catlog
03-01 02:40:30.062 1699 1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - [67.565ms] mOneCameraOpener.open()03-01 02:40:30.062 1699 1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - STOP03-01 02:40:30.063 1699 1741 E CAM_OneCamFtrCnfgCrtr: Unknown support level: 003-01 02:40:30.063 1699 1741 I CAM_OneCamCreator: Camera support level: LIMITED_JPEG03-01 02:40:30.063 1699 1741 W CAM_Log : Tag SimpleOneCameraFactory is 3 chars longer than limit.03-01 02:40:30.063 1699 1741 I CAM_OneCamCreator: Picture Size Configuration: PictureSizeCalculator.Configuration{native size=3264x2448, crop=Rect(0, 0 - 3264, 2448)}03-01 02:40:30.065 1699 1741 D CAM_CaptureModule: onCameraOpened: com.android.camera.one.v2.initialization.GenericOneCameraImpl@200eae903-01 02:40:30.065 1699 1741 D CAM_CaptureModule: picturesize:3264x2448,previewBuffer:1280x96003-01 02:40:30.065 1699 1741 D CAM_CaptureModule: starting preview ...03-01 02:40:30.068 1699 1699 W CAM_IndicatorIconCtrlr: Trying to sync a pano indicator that is not initialized.03-01 02:40:30.068 349 349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1 with consumer usage flag: 256: Forcing asynchronous mode for stream03-01 02:40:30.068 349 349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1: Overriding format 0x1 to IMPLEMENTATION_DEFINED03-01 02:40:30.069 265 265 D Camera3HAL: configure_streams: streams list ptr: 0xf6242dd0, num 2 03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml 03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get mediaCtl config03-01 02:40:30.070 265 1812 E RkCamera: <HAL> V4L2Subdev: queryDvTimings, ret:-1, I:0, wxh:0x003-01 02:40:30.070 265 1812 E RkCamera: <HAL> V4L2Subdev: VIDIOC_SUBDEV_QUERY_DV_TIMINGS failed: Inappropriate ioctl for device03-01 02:40:30.070 265 1812 E RkCamera: <HAL> PlatformData: Error queryDvTimings ret:-2147483648 (/dev/v4l-subdev3)03-01 02:40:30.070 265 1812 E RkCamera: <HAL> PlatformData: Error closing device (/dev/v4l-subdev3)03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2GraphConfig: getMediaDevInfo info.model:rkisp003-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get Imgu mediaCtl config03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2ImguUnit: Processing tasks creation failed (ret = -2147483648)03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2CameraHw: Unable to configure stream for imgunit03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RequestThread: Error configuring the streams @handleConfigureStreams:21303-01 02:40:30.070 265 1812 E RkCamera: <HAL> RequestThread: error -2147483648 in handling message: 303-01 02:40:30.071 349 349 E Camera3-Device: Camera 1: configureStreamsLocked: Set of requested inputs/outputs not supported by HAL03-01 02:40:30.071 349 349 E CameraDeviceClient: endConfigure: Camera 1: Unsupported set of inputs/outputs provided03-01 02:40:30.071 1699 1741 W CameraDevice-JV-1: Stream configuration failed due to: endConfigure:505: Camera 1: Unsupported set of inputs/outputs provided03-01 02:40:30.072 1699 1741 E CameraCaptureSession: Session 0: Failed to create capture session; configuration failed03-01 02:40:30.072 1699 1817 E CAM_CaptureModule: Could not set up preview.03-01 02:40:30.079 1699 1699 D CAM_LoggingImageReader: Closing: ImageReader{width=3264, height=2448, format=JPEG}03-01 02:40:30.081 349 349 I Camera3-Device: disconnectImpl: E03-01 02:40:30.088 349 349 I Camera3-Device: disconnectImpl: X03-01 02:40:30.094 349 349 I CameraService: disconnect: Disconnected client for camera 1 for PID 1699其中：
03-01 02:40:30.070 265 1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml提示分辨率不支持，
于是打开camera3_profiles.xml，将所有3264x2448修改为2592x1944
<jpeg.maxSize value="5038848"/> <!-- 3264*2448*1.5 2592x1944*1.5= 5038848 --> <sensor.info.activeArraySize value="0,0,2592,1944"/> <sensor.info.pixelArraySize value="2592x1944"/> <supportTuningSize value="2592x1944"/>将下面几个属性所有关3264x2448的全部删除
<scaler.availableStreamConfigurations value="BLOB,3264x2448,OUTPUT,<scaler.availableMinFrameDurations value=<scaler.availableStallDurations value="2592*1944*1.5= 5038848八、其他问题
1. 前置摄像头旋转了180°
修改xml文件
<sensor.orientation value="90"/>2. 闪光灯
<flash.info.available value="TRUE"/>