标准系统方案之扬帆移植案例
本文章是基于瑞芯微RK3399芯片的yangfan开发板，进行标准系统相关功能的移植，主要包括产品配置添加，内核启动、升级，音频ADM化，Camera，TP，LCD，WIFI，BT，vibrator、sensor、图形显示模块的适配案例总结，以及相关功能的适配。 开发板系统移植采用Board仓和SoC代码分离方案，Board仓保存板载驱动的模块，例如音频，Camera，TP，WIFI等驱动模块的适配代码。在SoC仓保存与SoC驱动相关模块，例如I2C，ISP，RGA等驱动模块的适配代码。
产品配置和目录规划
产品配置
在产品//vendor/yangfan目录下创建config.json文件，并指定CPU的架构。//vendor/yangfan/rk3399.json配置如下：
{"product_name": "yangfan",---产品名：yangfan"device_company": "rockchip",---单板厂商：rockchip"device_build_path": "device/board/isoftstone/yangfan",---设备构建路径：device/board/isoftstone/yangfan"target_cpu": "arm",---目标cpu：arm"type": "standard",---配置系统的级别：standard"version": "3.0",---版本：3.0"board": "yangfan",---单板名：yangfan"enable_ramdisk": true,---启用内存虚拟盘：true"build_selinux": true,---构建selinux：true"inherit": [ "productdefine/common/inherit/rich.json", "productdefine/common/inherit/chipset_common.json" ],"subsystems": [{"subsystem": "security","components": [{"component": "selinux","features": []}]},{"subsystem": "communication","components": [{"component": "netmanager_ext","features": []}]},...
}
主要的配置内容包括：
- “product_name”: “yangfan”,—产品名：yangfan
- “device_company”: “rockchip”,—单板厂商：rockchip
- “device_build_path”: “device/board/isoftstone/yangfan”,—设备构建路径：device/board/isoftstone/yangfan
- “target_cpu”: “arm”,—目标cpu：arm
- “type”: “standard”,—配置系统的级别：standard
- “version”: “3.0”,—版本：3.0
- “board”: “yangfan”,—单板名：yangfan
- “enable_ramdisk”: true,—启用内存虚拟盘：true
已定义的子系统可以在//build/subsystem_config.json中找到。当然也可以定制子系统。
建议先拷贝Hi3516DV300开发板的配置文件，删除掉hisilicon_products子系统。该子系统为Hi3516DV300 SOC编译内核，不适合RK3568。
目录规划
参考[Board和SoC解耦的设计思路]，并把芯片适配目录规划为：
device
├── board --- 单板厂商目录
│ └── isoftstone --- 单板厂商名字：
│ └── yangfan --- 单板名：扬帆,主要放置开发板相关的驱动业务代码
└── soc --- SoC厂商目录└── rockchip --- SoC厂商名字：rockchip└── rk3399 --- SoC Series名：rk3399,主要为芯片原厂提供的一些方案，以及闭源库等产品样例目录规划为：
vendor
└── isoftstone └── yangfan --- 产品名字：产品、hcs以及demo相关
内核启动
二级启动
二级启动简单来说就是将之前直接挂载system，从system下的init启动，改成先挂载ramdsik，从ramdsik中的init 启动，做些必要的初始化动作，如挂载system，vendor等分区，然后切到system下的init 。
RK3399适配主要是将主线编译出来的ramdisk 打包到boot_linux.img中，主要有以下工作：
- 使能二级启动
在//vendor/yangfan/rk3399.json中使能enable_ramdisk。
{"product_name": "yangfan","device_company": "rockchip","device_build_path": "device/board/isoftstone/yangfan","target_cpu": "arm","type": "standard","version": "3.0","board": "yangfan","enable_ramdisk": true,"build_selinux": true,...
}
- 将主线编译出来的ramdsik.img 打包到boot_linux.img
配置：
由于rk 启动uboot 支持从ramdisk 启动，只需要在打包boot_linux.img 的配置文件中增加ramdisk.img ，因此没有使用主线的its格式，具体配置就是在内核编译脚本make-ohos.sh 中增加:
function make_extlinux_conf()
{dtb_path=$1uart=$2image=$3echo "label rockchip-kernel-5.10" > ${EXTLINUX_CONF}echo " kernel /extlinux/${image}" >> ${EXTLINUX_CONF}echo " fdt /extlinux/${TOYBRICK_DTB}" >> ${EXTLINUX_CONF}if [ "enable_ramdisk" == "${ramdisk_flag}" ]; thenecho " initrd /extlinux/ramdisk.img" >> ${EXTLINUX_CONF}ficmdline="append earlycon=uart8250,mmio32,${uart} root=PARTUUID=614e0000-0000-4b53-8000-1d28000054a9 rw rootwait rootfstype=ext4"echo " ${cmdline}" >> ${EXTLINUX_CONF}
}
打包
增加了打包boot镜像的脚本make-boot.sh，供编译完ramdisk，打包boot 镜像时调用，主要内容:
genext2fs -B ${blocks} -b ${block_size} -d boot_linux -i 8192 -U boot_linux.img
INIT配置
音频
简介
本文以OpenHarmony 3.0为基础，讲解基于HDF(Hardware Driver Foundation)驱动框架开发的Audio驱动框架，包括Audio驱动的架构组成、功能部件的实现和服务节点详细介绍。
-
ADM（Audio Driver Model)
音频驱动框架模型，向上服务于多媒体音频子系统，便于系统开发者能够更便捷的根据场景来开发应用。向下服务于具体的设备厂商，对于Codec和DSP设备厂商来说，可根据ADM模块提供的向下统一接口适配各自的驱动代码，就可以实现快速开发和适配HOS系统。
-
Audio Control Dispatch
接收lib层的控制指令并将控制指令分发到驱动层。
-
Audio Stream Dispatch
向上通过lib层完成数据流的接收，向下完成数据流对驱动层的分发。
-
Card Manager
多声卡管理模块。每个声卡含有Dai、Platform、Codec、Accessory、Dsp、Sapm模块。
-
Platform Driver
驱动适配层。
-
SAPM（Smart Audio Power Manager）
电源管理模块，对整个ADM电源进行功耗策略优化。
Audio驱动介绍
代码目录
drivers├── framework│ └── model│ │ └── audio #框架代码│ │ ├─── common #公共实现│ │ ├─── core #核心│ │ ├─── dispatch #控制流和数据流实现│ │ └── sapm #电源管理│ └── include│ └── audio #对外接口├── adapter│ └──khdf│ └── linux│ └── model│ └── audio #编译文件└── peripheral└── audio└── chipsets └── rk3399 #驱动实现├── accessory #SmartPA驱动├── dai #I2S驱动└── soc #Dma驱动
Audio流程说明
启动流程
- 系统启动时audio模块的Platform、Codec、Accessory、Dsp、Dai各个驱动首先被加载，各驱动从各自私有配置文件中获取配置信息，并将获取的配置信息保存到各驱动的Data数据结构中。
- 各驱动模块调用ADM注册接口将自己添加到各驱动模块的链表中。
- ADM模块读取hdf_audio_driver_0（音频card_0）和hdf_audio_driver_1（音频card_1）配置信息，加载各模块的具体设备。
- ADM模块调用各模块的初始化函数对各模块设备进行初始化。
- 将初始化成功的音频设备添加到cardManager链表。
播放流程
- 播放音频，首先Interface Lib层通过播放流服务下发Render Open指令，Render Stream Dispatch服务收到指令后分别调用各模块的函数接口对指令进行下发。
- Interface Lib层通过控制服务下发通路选择指令，Control Dispatch控制服务收到指令后调用Dai模块接口设置通路。
- Interface Lib层通过播放流服务下发硬件参数，Render Stream Dispatch服务收到参数后分别调用各模块参数设置接口，对硬件参数进行设置。
- Interface Lib层通过播放流服务下发播放启动指令，Render Stream Dispatch服务收到指令后分别调用各模块启动接口，对各模块进行启动设置。
- Interface Lib层通过播放流服务下发音频数据，Render Stream Dispatch服务收到数据后调用Platform AudioPcmWrite接口将音频数据传给Dma。
- Interface Lib层通过播放流服务下发播放停止指令，Render Stream Dispatch服务收到指令后分别调用各模块停止接口，对各模块进行停止设置。
- Interface Lib层通过播放流服务下发Render Close指令，Render Stream Dispatch服务收到指令后调用Platform AudioRenderClose接口对已申请资源进行释放。
控制流程
- 设置音量，首先Interface Lib层通过控制服务下发获取音量范围指令，Control Dispatch控制服务收到指令后进行解析并调用Codec模块Get函数接口获取可设置音量范围。
- Interface Lib层通过控制服务下发设置音量指令，Control Dispatch控制服务收到指令后进行解析并调用Codec模块Set函数接口设置音量。
实现说明
-
驱动注册
以codec的注册函数为例，当codec驱动初始化时调用如下codec注册函数，将codec注册到codecController链表中。
int32_t AudioRegisterCodec(struct HdfDeviceObject *device, struct CodecData *codecData, struct DaiData *daiData) { ...codec = (struct CodecDevice *)OsalMemCalloc(sizeof(*codec)); ...OsalMutexInit(&codec->mutex);codec->devCodecName = codecData->drvCodecName;codec->devData = codecData;codec->device = device;ret = AudioSocRegisterDai(device, daiData); ...DListInsertHead(&codec->list, &codecController); ... } c -
数据流数据分发
当录音或者播放时，上层lib层通过dispatch将数据下发或读取数据，此接口接收到lib层的请求后，将数据进行分发或将数据返回。
static int32_t StreamDispatch(struct HdfDeviceIoClient *client, int cmdId,struct HdfSBuf *data, struct HdfSBuf *reply) {unsigned int count = sizeof(g_streamDispCmdHandle) / sizeof(g_streamDispCmdHandle[0]);for (unsigned int i = 0; i < count; ++i) {if ((cmdId == (int)(g_streamDispCmdHandle[i].cmd)) && (g_streamDispCmdHandle[i].func != NULL)) {return g_streamDispCmdHandle[i].func(client, data, reply);}}ADM_LOG_ERR("invalid [cmdId=%d]", cmdId);return HDF_FAILURE; } c -
控制功能注册接口
音量控制、增益控制、通路控制等控制功能都是通过此接口添加到声卡控制列表。
int32_t AudioAddControls(struct AudioCard *audioCard, const struct AudioKcontrol *controls, int32_t controlMaxNum) { ...for (i = 0; i < controlMaxNum; i++) {control = AudioAddControl(audioCard, &controls[i]);if (control == NULL) {ADM_LOG_ERR("Add control fail!");return HDF_FAILURE;}DListInsertHead(&control->list, &audioCard->controls);}ADM_LOG_DEBUG("Success.");return HDF_SUCCESS; } c -
电源管理接口
添加组件实现：
int32_t AudioSapmNewComponents(struct AudioCard *audioCard,const struct AudioSapmComponent *component, int32_t cptMaxNum) { ...for (i = 0; i < cptMaxNum; i++) {ret = AudioSapmNewComponent(audioCard, component);if (ret != HDF_SUCCESS) {ADM_LOG_ERR("AudioSapmNewComponent fail!");return HDF_FAILURE;}component++;}return HDF_SUCCESS; }c添加通路实现：
int32_t AudioSapmAddRoutes(struct AudioCard *audioCard, const struct AudioSapmRoute *route, int32_t routeMaxNum) { ...for (i = 0; i < routeMaxNum; i++) {ret = AudioSapmAddRoute(audioCard, route);if (ret != HDF_SUCCESS) {ADM_LOG_ERR("AudioSapmAddRoute failed!");return HDF_FAILURE;}route++;}return HDF_SUCCESS; }c添加控制功能实现：
int32_t AudioSapmNewControls(struct AudioCard *audioCard) { ...DLIST_FOR_EACH_ENTRY(sapmComponent, &audioCard->components, struct AudioSapmComponent, list) {if (sapmComponent->newCpt) {continue;}if (sapmComponent->kcontrolsNum > 0) {sapmComponent->kcontrols = OsalMemCalloc(sizeof(struct AudioKcontrol*) * sapmComponent->kcontrolsNum);if (sapmComponent->kcontrols == NULL) {ADM_LOG_ERR("malloc kcontrols fail!");return HDF_FAILURE;}}switch (sapmComponent->sapmType) {case AUDIO_SAPM_ANALOG_SWITCH:case AUDIO_SAPM_MIXER:case AUDIO_SAPM_MIXER_NAMED_CTRL:case AUDIO_SAPM_SPK:case AUDIO_SAPM_PGA:ret = AudioSapmNewMixerControls(sapmComponent, audioCard);break;case AUDIO_SAPM_MUX:case AUDIO_SAPM_VIRT_MUX:case AUDIO_SAPM_VALUE_MUX:ret = AudioSapmNewMuxControls(sapmComponent, audioCard);break;default:ret = HDF_SUCCESS;break;} ...ReadInitComponentPowerStatus(sapmComponent);sapmComponent->newCpt = 1;DListInsertTail(&sapmComponent->dirty, &audioCard->sapmDirty);}ret = AudioSapmPowerComponents(audioCard); ...return HDF_SUCCESS; }c -
控制流数据分发
当录音或者播放时，上层lib层通过dispatch将控制指令下发，此接口接收到lib层的控制指令后，将控制指令分发到各驱动模块。
static int32_t ControlDispatch(struct HdfDeviceIoClient *client, int cmdId,struct HdfSBuf *data, struct HdfSBuf *reply) { ...if (cmdId >= AUDIODRV_CTRL_IOCTRL_ELEM_BUTT || cmdId < 0) {ADM_LOG_ERR("Invalid [cmdId=%d].", cmdId);return HDF_FAILURE;}for (i = 0; i < HDF_ARRAY_SIZE(g_controlDispCmdHandle); ++i) {if ((cmdId == (int)(g_controlDispCmdHandle[i].cmd)) && (g_controlDispCmdHandle[i].func != NULL)) {return g_controlDispCmdHandle[i].func(client, data, reply);}}return HDF_FAILURE; } c
Audio服务介绍
服务节点
基于ADM框架的audio驱动对HDI层提供三个服务hdf_audio_render、hdf_audio_capture、hdf_audio_control。 开发板audio驱动服务节点如下：
console:/dev # ls -al hdf_audio_*
crw------- 1 system system 249, 5 1970-01-01 00:21 hdf_audio_capture //录音数据流服务。
crw------- 1 system system 249, 3 1970-01-01 00:21 hdf_audio_codec_dev0 //音频设备名称。
crw------- 1 system system 249, 4 1970-01-01 00:21 hdf_audio_control //音频控制流服务。
crw------- 1 system system 249, 6 1970-01-01 00:21 hdf_audio_render //播放数据流务。
-
音频控制流服务
用来接收上层lib层下发的控制指令，包括音量控制、增益控制、通路控制，这些控制指令都是通过控制流服务下发到驱动。
-
音频数据播放流服务
用来接收上层lib层下发的音频数据和播放相关的参数，还有播放的启动、暂停、恢复、停止指令，这些指令都是由播放数据流下发到驱动。
-
音频数据录音流服务
用来向上层lib层传输音频数据和接收上层lib层下发的录音相关的参数，还有录音的启动、暂停、恢复、停止指令，这些指令都是由录音数据流下发到驱动。
驱动服务
每个audio设备包括如下服务：
| hdf_audio_codec_dev0 | 音频设备名称 |
|---|---|
| dma_service_0 | dma 驱动服务 |
| dai_service | cpu dai 驱动服务 |
| codec_service_0 | codec 驱动服务 |
| dsp_service_0 | dsp 驱动服务（可选项） |
| hdf_audio_codec_dev1 | 音频设备名称 |
|---|---|
| dma_service_0 | dma 驱动服务 |
| dai_service | cpu dai 驱动服务 |
| codec_service_1 | accessory 驱动服务（特指smartPA） |
| dsp_service_0 | dsp 驱动服务（可选项） |
代码路径
vendor/rockchip/rk3399/hdf_config/khdf
├── audio #audio私有配置文件
├── device_info
| └── device_info.hcs #设备配置文件
└── hdf.hcs #引用hcs配置文件
配置节点说明
以codec驱动为例，在device_info.hcs文件中的audio host节点下添加codec节点信息。
audio :: host {hostName = "audio_host";priority = 60;
...device_codec :: device {device0 :: deviceNode {policy = 1;priority = 50;preload = 0;permission = 0666;moduleName = "CODEC_ES8316";serviceName = "codec_service_0";deviceMatchAttr = "hdf_codec_driver";}}
...}
实现驱动
在驱动文件中实现与device_info.hcs配置节点moduleName相同的驱动逻辑。
/* HdfDriverEntry implementations */
static int32_t Es8316DriverBind(struct HdfDeviceObject *device)
{
...return HDF_SUCCESS;
}static int32_t Es8316DriverInit(struct HdfDeviceObject *device)
{
...return HDF_SUCCESS;
}/* HdfDriverEntry definitions */
struct HdfDriverEntry g_es8316DriverEntry = {.moduleVersion = 1,.moduleName = "CODEC_ES8316",.Bind = Es8316DriverBind,.Init = Es8316DriverInit,.Release = NULL,
};
HDF_INIT(g_es8316DriverEntry);
总结
基于HDF框架的ADM音频框架，为Open Harmony的音频开发提供了统一的架构基础，为各平台音频驱动适配提供了统一的接口。音频驱动可以一平台开发多平台适用，提高了开发效率。此文档对ADM框架进行了简单的介绍，希望有助于开发者开发和应用。
Camera
简介
本文以OpenHarmony 3.0为基础，讲解基于HDF(Hardware Driver Foundation)驱动框架开发的Camera驱动框架，包括Camera驱动的架构组成、功能部件的实现和服务节点详细介绍。
Camera驱动框架图
OpenHarmony HDF Camera驱动模块架构图
以Camera Host 部分做如下说明：
- HDI实现层(HDI Implementation)：对上实现Open Harmony OS相机标准南向接口。
- 框架层(PipelineCore)：对接HDI实现层的控制、流的转发，实现数据通路的搭建、管理相机各个硬件设备等功能。
- 适配层(Platform Adaption)：屏蔽底层芯片和OS差异，支持多平台适配。
对于rk3399E/T的Usb Camera来分析，内核使用linux-4.19。Usb Camera依赖linux下的V4L2的uvc，从上面的框架图分析HDF Camera已经实现了兼容linux 的 V4L2 uvc，所以调试过程首先要保证uvc所涉及的USB和Camera的驱动正常。
Camera驱动介绍
配置信息
arch/arm64/configs/rockchip_linux_defconfig
CONFIG_VIDEO_V4L2_SUBDEV_API=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=y
c
节点信息
插入Usb Camera 前
# ls -l dev/video*
crw-rw---- 1 root root 81, 0 2013-01-18 10:59 dev/video0
crw-rw---- 1 root root 81, 1 2013-01-18 10:59 dev/video1
crw-rw---- 1 root root 81, 2 2013-01-18 10:59 dev/video2
crw-rw---- 1 root root 81, 3 2013-01-18 10:59 dev/video3
crw-rw---- 1 root root 81, 4 2013-01-18 10:59 dev/video4
crw-rw---- 1 root root 81, 5 2013-01-18 10:59 dev/video5
crw-rw---- 1 root root 81, 6 2013-01-18 10:59 dev/video6
crw-rw---- 1 root root 81, 7 2013-01-18 10:59 dev/video7
crw-rw---- 1 root root 81, 8 2013-01-18 10:59 dev/video8
crw-rw---- 1 root root 81, 9 2013-01-18 10:59 dev/video9
#
插入Usb Camera后新增节点dev/video10和dev/video11
# ls -l dev/video*
crw-rw---- 1 root root 81, 0 2013-01-18 10:59 dev/video0
crw-rw---- 1 root root 81, 1 2013-01-18 10:59 dev/video1
crw------- 1 root root 81, 10 2013-01-18 11:01 dev/video10
crw------- 1 root root 81, 11 2013-01-18 11:01 dev/video11
crw-rw---- 1 root root 81, 2 2013-01-18 10:59 dev/video2
crw-rw---- 1 root root 81, 3 2013-01-18 10:59 dev/video3
crw-rw---- 1 root root 81, 4 2013-01-18 10:59 dev/video4
crw-rw---- 1 root root 81, 5 2013-01-18 10:59 dev/video5
crw-rw---- 1 root root 81, 6 2013-01-18 10:59 dev/video6
crw-rw---- 1 root root 81, 7 2013-01-18 10:59 dev/video7
crw-rw---- 1 root root 81, 8 2013-01-18 10:59 dev/video8
crw-rw---- 1 root root 81, 9 2013-01-18 10:59 dev/video9
#
打开设备节点
在Open Harmony OS的代码环境中，编译如下代码为可执行程序，在开发板测执行，无报错说明该节点open success。
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/videodev2.h>
#include <string.h>
#include <sys/mman.h>int main(void)
{// 1. 打开设备int fd = open("/dev/video10", O_RDWR);if (fd < 0) {printf("open device fail\n");return -1;}close(fd);return 0;
}
c
获取参数
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/videodev2.h>
#include <string.h>
#include <sys/mman.h>int main(void)
{// 1. 打开设备int fd = open("/dev/video10", O_RDWR);if (fd < 0) {printf("open device fail\n");return -1;}// 2. 获取摄像头支持的格式 ioctl(文件描述符, 命令, 与命令对应的结构体)struct v4l2_fmtdesc v4fmt;v4fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;int i = 0;while(1) {v4fmt.index = i++;int ret = ioctl(fd, VIDIOC_ENUM_FMT, &v4fmt);if (ret < 0) {printf("get fmt fail\n");}unsigned char *p = (unsigned char*)&v4fmt.pixelformat;printf("index=%d\n", v4fmt.index);printf("flags=%d\n", v4fmt.flags);printf("description=%s\n", v4fmt.description);printf("pixelformat=%c%c%c%c\n", p[0], p[1], p[2], p[3]);printf("reserved=%d\n", v4fmt.reserved[0]);}close(fd);return 0;
}
c
在Open Harmony OS的代码环境中，编译如上代码为可执行程序，在开发板测执行。结果显示支持YUYV和MJPEG 2种输出格式。
index=0flags=0description=YUYV 4:2:2pixelformat=YUYVreserved=0index=1flags=1description=Motion-JPEGpixelformat=MJPGreserved=0
设置缓冲区队列
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/videodev2.h>
#include <string.h>
#include <sys/mman.h>int main(void)
{// 1. 打开设备int fd = open("/dev/video10", O_RDWR);if (fd < 0) {printf("open device fail\n");return -1;}// 2. 设置采集格式struct v4l2_format vfmt;vfmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;vfmt.fmt.pix.width = 640;vfmt.fmt.pix.height = 480;vfmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; // 设置的视频采集格式（与上面获取的格式一致）int ret = ioctl(fd, VIDIOC_S_FMT, &vfmt); // 设置格式if (ret < 0) {printf("set fmt fail\n");return -1;}memset(&vfmt, 0, sizeof(vfmt));vfmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;ret = ioctl(fd, VIDIOC_G_FMT, &vfmt); // 获取格式if (ret < 0) {printf("set->get fmt fail\n");return -1;}// 3. 申请内核缓冲区队列struct v4l2_requestbuffers reqbuffer;reqbuffer.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;reqbuffer.count = 4; // 申请4个缓冲区reqbuffer.memory = V4L2_MEMORY_MMAP; // 内存映射方式 MMAP/USERPTRret = ioctl(fd, VIDIOC_REQBUFS, &reqbuffer); // 分配内存if (ret < 0) {printf("req buffer fail\n");return -1;}// 4. 关闭设备close(fd);return 0;
}
c
在Open Harmony OS的代码环境中，编译如上代码为可执行程序，在开发板测执行。
执行结果：req buffer fail
原因分析：ioctl(fd, VIDIOC_REQBUFS, &reqbuffer); 失败
定位方法1：在内核中加LOG定位VIDIOC_REQBUFS失败的地方。发现所有的ioctl命令下发后都会使用drivers/media/v4l2-core/v4l2-ioctl.c中的video_usercopy接口，但还是没有定位到具体的失败原因。
定位方法2：求助视美泰验证linux-4.19内核debian版本的Usb Camera是否OK。结果：debian版本使用gst-launch-1.0 v4l2src device=/dev/video10 ! image/jpeg, width= 1280, height=720, framerate=30/1 ! jpegparse ! mppjpegdec ! kmssink sync=false命令后HDMI屏幕可以出来正常的预览画面。
通过如上的操作后，基本可以确认linux的V4L2 uvc驱动和外设Usb Camera驱动都是正常的。接下来就该调试Open Harmony OS的HDF Camera了。
接口介绍
查看现有Open Harmony OS上的关于camera的可执行程序：ohos_camera_demo、v4l2_main
ohos_camera_demo
执行结果：输入o后无预览画面，也无LOG报错信息。
# ohos_camera_demo
GetUintParameter debug.bytrace.tags.enableflags error.
Options:
-h | --help Print this message
-o | --offline stream offline test
-c | --capture capture one picture
-w | --set WB Set white balance Cloudy
-v | --video capture Viedeo of 10s
-a | --Set AE Set Auto exposure
-f | --Set Flashlight Set flashlight ON 5s OFF
-q | --quit stop preview and quit this app
o
Options:
-h | --help Print this message
-o | --offline stream offline test
-c | --capture capture one picture
-w | --set WB Set white balance Cloudy
-v | --video capture Viedeo of 10s
-a | --Set AE Set Auto exposure
-f | --Set Flashlight Set flashlight ON 5s OFF
-q | --quit stop preview and quit this app
原因分析：ohos_camera_demo目前仅支持MPP，不支持V4L2，故先放弃该demo调试。
v4l2_main
执行结果：输入u 报错：ERROR:main test:cannot open framebuffer /dev/fb0 file node
Options:
-h | --help Print this message
-p | --preview start preview on platform sensor
-c | --capture capture one picture
-w | --set WB Set white balance Cloudy
-e | --Set AE Set exposure time
-v | --video capture Viedeo of 10s
-u | --uvc start preview on uvc preview
-a | --Set ATE Set Auto exposure
-q | --quit stop preview and quit this app
INFO:please input command(input -q exit this app)u
ERROR:main test:cannot open framebuffer /dev/fb0 file nodeINFO:V4L2OpenDevice /dev/video10
原因分析：查看dev/fb0节点是否存在：不存在fb0节点。继续查找根目录下有无其他fb0节点，出现了dev/graphics/fb0节点。
# ls -l dev/fb0
ls: dev/fb0: No such file or directory# find -name fb0
./dev/graphics/fb0
./sys/class/graphics/fb0
./sys/devices/platform/display-subsystem/graphics/fb0
需把v4l2_main可执行程序中的dev/fb0改为dev/graphics/fb0。此处fb0为framebuffer，作用是在屏幕上显示预览画面。
修改点：drivers/peripheral
diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
index b351f49..d9c4cb3 100755
--- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
+++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
@@ -186,9 +186,9 @@ RetCode FBInit()if (g_fbFd)return RC_OK;- g_fbFd = open("/dev/fb0", O_RDWR);
+ g_fbFd = open("/dev/graphics/fb0", O_RDWR);if (g_fbFd < 0) {
- CAMERA_LOGE("main test:cannot open framebuffer %s file node\n", "/dev/fb0");
+ CAMERA_LOGE("main test:cannot open framebuffer %s file node\n", "/dev/graphics/fb0");return RC_ERROR;}diff --git a/camera/hal/test/v4l2/src/test_display.cpp b/camera/hal/test/v4l2/src/test_display.cpp
index db908e7..7025deb 100644
--- a/camera/hal/test/v4l2/src/test_display.cpp
+++ b/camera/hal/test/v4l2/src/test_display.cpp
@@ -114,9 +114,9 @@ void TestDisplay::FBLog()RetCode TestDisplay::FBInit(){
- fbFd_ = open("/dev/fb0", O_RDWR);
+ fbFd_ = open("/dev/graphics/fb0", O_RDWR);if (fbFd_ < 0) {
- CAMERA_LOGE("main test:cannot open framebuffer %s file node\n", "/dev/fb0");
+ CAMERA_LOGE("main test:cannot open framebuffer %s file node\n", "/dev/graphics/fb0");return RC_ERROR;}@@ -439,4 +439,4 @@ void TestDisplay::StopStream(std::vector<int>& captureIds, std::vector<int>& strstd::cout << "==========[test log]check Capture: ReleaseStreams fail, rc = " << rc << std::endl;}}
-}
\ No newline at end of file
+}
diff --git a/display/hal/default/display_layer.c b/display/hal/default/display_layer.c
index ee7a825..e12a653 100644
--- a/display/hal/default/display_layer.c
+++ b/display/hal/default/display_layer.c
@@ -24,7 +24,7 @@#define DEV_ID 0#define LAYER_ID 0
-#define FB_PATH "/dev/fb0"
+#define FB_PATH "/dev/graphics/fb0"#define DISP_WIDTH 800#define DISP_HEIGHT 480#define BITS_PER_PIXEL 32
diff
修改后重新编译v4l2_main，编译命令：./build.sh --product-name rk3399 --ccache --build-target v4l2_main
编译成功后可执行程序路径：./out/rk3399/hdf/hdf/v4l2_main
将新编译的v4l2_main推送到开发板测的system/bin路径下：
hdc shell "mount -o rw,remount /"
hdc file send D:\cyyanl\work\RockChip\bin\v4l2_main /system/bin
继续执行v4l2_main结果后无framebuffer报错，说明该问题已解决。（另一种思路：分析fb0为何在/dev/graphics/fb0而不是常规的/dev/fb0，然后修改为/dev/fb0。后面有时间再调试该思路）
新报错：ERROR:error: ioctl VIDIOC_QUERYBUF failed.
Options:
-h | --help Print this message
-p | --preview start preview on platform sensor
-c | --capture capture one picture
-w | --set WB Set white balance Cloudy
-e | --Set AE Set exposure time
-v | --video capture Viedeo of 10s
-u | --uvc start preview on uvc preview
-a | --Set ATE Set Auto exposure
-q | --quit stop preview and quit this app
INFO:please input command(input -q exit this app)
u
INFO:the fixed information is as follow:
INFO:id=
INFO:sem_start=0
INFO:smem_len=2457600
...
INFO:V4L2AllocBuffer
INFO:V4L2AllocBuffer:memoryType_ = 2
INFO:V4L2AllocBuffer:V4L2_MEMORY_USERPTR = 2
INFO:V4L2AllocBuffer:VIDIOC_QUERYBUF = 3226490377
ERROR:error: ioctl VIDIOC_QUERYBUF failed.
ERROR:error: Creatbuffer: V4L2AllocBuffer error
ERROR:main test:V4L2PreviewThread CreatBuffer fail i = 0
原因分析：ioctl(fd, VIDIOC_QUERYBUF, &buf)失败。回过头再看"调试linux L4V2 uvc驱动章节->设置格式申请缓冲区队列"中的报错也是
ioctl(fd, VIDIOC_REQBUFS, &reqbuffer)。由此分析出Open Harmony OS上的ioctl VIDIOC_REQBUFS都会报错。再看两次失败的差异点：
内存映射方式不同： V4L2_MEMORY_MMAP和V4L2_MEMORY_USERPTR
从OpenHarmony的issuse得知暂不支持V4L2_MEMORY_MMAP内存映射，映射方式就分析到这里，接下来还是用v4l2_main的V4L2_MEMORY_USERPTR进行调试分析。
参考：[V4L2设备增加MMAP申请内存的方式]和下图
接着再分析ioctl(fd, VIDIOC_QUERYBUF, &buf)失败，查看VIDIOC_QUERYBUF的定义：videodev2.h
#define VIDIOC_QUERYBUF_IOWR('V', 9, struct v4l2_buffer)
c
此处插入ioctl的定义：int ioctl(int fd, int cmd, …); VIDIOC_QUERYBUF作为cmd的入参，是int类型。也就是一个数字命令码，该命令码通过ioctl发送给内核后，会有与之对应的函数操作，故用户态下发的命令码应和内核接受的命令码一致。下面验证命令码一致性。
videodev2.h中一共有77个和内核交互的命令码，把内核态和用户态的都打印出来做对比：
用户态加打印：drivers/peripheral
diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp
index d7dd15f..f7254b4 100644
--- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp
+++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp
@@ -162,37 +162,119 @@ RetCode HosV4L2Buffers::V4L2DequeueBuffer(int fd)return RC_OK;}+static void cyyanl_printf_cmd(void)
+{
+#if 1
+ CAMERA_LOGD("*************************************************************************************");
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYCAP ) = 0x%x\n", VIDIOC_QUERYCAP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FMT ) = 0x%x\n", VIDIOC_ENUM_FMT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_FMT ) = 0x%x\n", VIDIOC_G_FMT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_FMT ) = 0x%x\n", VIDIOC_S_FMT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_REQBUFS ) = 0x%x\n", VIDIOC_REQBUFS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYBUF ) = 0x%x\n", VIDIOC_QUERYBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_FBUF ) = 0x%x\n", VIDIOC_G_FBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_FBUF ) = 0x%x\n", VIDIOC_S_FBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_OVERLAY ) = 0x%x\n", VIDIOC_OVERLAY );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QBUF ) = 0x%x\n", VIDIOC_QBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_EXPBUF ) = 0x%x\n", VIDIOC_EXPBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_DQBUF ) = 0x%x\n", VIDIOC_DQBUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_STREAMON ) = 0x%x\n", VIDIOC_STREAMON );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_STREAMOFF ) = 0x%x\n", VIDIOC_STREAMOFF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_PARM ) = 0x%x\n", VIDIOC_G_PARM );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_PARM ) = 0x%x\n", VIDIOC_S_PARM );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_STD ) = 0x%x\n", VIDIOC_G_STD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_STD ) = 0x%x\n", VIDIOC_S_STD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMSTD ) = 0x%x\n", VIDIOC_ENUMSTD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMINPUT ) = 0x%x\n", VIDIOC_ENUMINPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_CTRL ) = 0x%x\n", VIDIOC_G_CTRL );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_CTRL ) = 0x%x\n", VIDIOC_S_CTRL );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_TUNER ) = 0x%x\n", VIDIOC_G_TUNER );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_TUNER ) = 0x%x\n", VIDIOC_S_TUNER );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_AUDIO ) = 0x%x\n", VIDIOC_G_AUDIO );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_AUDIO ) = 0x%x\n", VIDIOC_S_AUDIO );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYCTRL ) = 0x%x\n", VIDIOC_QUERYCTRL );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYMENU ) = 0x%x\n", VIDIOC_QUERYMENU );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_INPUT ) = 0x%x\n", VIDIOC_G_INPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_INPUT ) = 0x%x\n", VIDIOC_S_INPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_EDID ) = 0x%x\n", VIDIOC_G_EDID );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_EDID ) = 0x%x\n", VIDIOC_S_EDID );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_OUTPUT ) = 0x%x\n", VIDIOC_G_OUTPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_OUTPUT ) = 0x%x\n", VIDIOC_S_OUTPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMOUTPUT ) = 0x%x\n", VIDIOC_ENUMOUTPUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_AUDOUT ) = 0x%x\n", VIDIOC_G_AUDOUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_AUDOUT ) = 0x%x\n", VIDIOC_S_AUDOUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_MODULATOR ) = 0x%x\n", VIDIOC_G_MODULATOR );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_MODULATOR ) = 0x%x\n", VIDIOC_S_MODULATOR );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_FREQUENCY ) = 0x%x\n", VIDIOC_G_FREQUENCY );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_FREQUENCY ) = 0x%x\n", VIDIOC_S_FREQUENCY );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_CROPCAP ) = 0x%x\n", VIDIOC_CROPCAP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_CROP ) = 0x%x\n", VIDIOC_G_CROP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_CROP ) = 0x%x\n", VIDIOC_S_CROP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_JPEGCOMP ) = 0x%x\n", VIDIOC_G_JPEGCOMP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_JPEGCOMP ) = 0x%x\n", VIDIOC_S_JPEGCOMP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYSTD ) = 0x%x\n", VIDIOC_QUERYSTD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_FMT ) = 0x%x\n", VIDIOC_TRY_FMT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMAUDIO ) = 0x%x\n", VIDIOC_ENUMAUDIO );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMAUDOUT ) = 0x%x\n", VIDIOC_ENUMAUDOUT );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_PRIORITY ) = 0x%x\n", VIDIOC_G_PRIORITY );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_PRIORITY ) = 0x%x\n", VIDIOC_S_PRIORITY );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_SLICED_VBI_CAP ) = 0x%x\n", VIDIOC_G_SLICED_VBI_CAP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_LOG_STATUS ) = 0x%x\n", VIDIOC_LOG_STATUS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_EXT_CTRLS ) = 0x%x\n", VIDIOC_G_EXT_CTRLS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_EXT_CTRLS ) = 0x%x\n", VIDIOC_S_EXT_CTRLS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_EXT_CTRLS ) = 0x%x\n", VIDIOC_TRY_EXT_CTRLS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FRAMESIZES ) = 0x%x\n", VIDIOC_ENUM_FRAMESIZES );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FRAMEINTERVALS) = 0x%x\n", VIDIOC_ENUM_FRAMEINTERVALS);
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_ENC_INDEX ) = 0x%x\n", VIDIOC_G_ENC_INDEX );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENCODER_CMD ) = 0x%x\n", VIDIOC_ENCODER_CMD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_ENCODER_CMD ) = 0x%x\n", VIDIOC_TRY_ENCODER_CMD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_HW_FREQ_SEEK ) = 0x%x\n", VIDIOC_S_HW_FREQ_SEEK );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_CREATE_BUFS ) = 0x%x\n", VIDIOC_CREATE_BUFS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_PREPARE_BUF ) = 0x%x\n", VIDIOC_PREPARE_BUF );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_G_SELECTION ) = 0x%x\n", VIDIOC_G_SELECTION );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_S_SELECTION ) = 0x%x\n", VIDIOC_S_SELECTION );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_DECODER_CMD ) = 0x%x\n", VIDIOC_DECODER_CMD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_DECODER_CMD ) = 0x%x\n", VIDIOC_TRY_DECODER_CMD );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_DV_TIMINGS ) = 0x%x\n", VIDIOC_ENUM_DV_TIMINGS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERY_DV_TIMINGS ) = 0x%x\n", VIDIOC_QUERY_DV_TIMINGS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_DV_TIMINGS_CAP ) = 0x%x\n", VIDIOC_DV_TIMINGS_CAP );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FREQ_BANDS ) = 0x%x\n", VIDIOC_ENUM_FREQ_BANDS );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_DBG_G_CHIP_INFO ) = 0x%x\n", VIDIOC_DBG_G_CHIP_INFO );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(VIDIOC_QUERY_EXT_CTRL ) = 0x%x\n", VIDIOC_QUERY_EXT_CTRL );
+ CAMERA_LOGD("cyyanl v4l2 ioctl cmd(BASE_VIDIOC_PRIVATE ) = 0x%x\n", BASE_VIDIOC_PRIVATE );
+ CAMERA_LOGD("*************************************************************************************");
+#endif
+}
+RetCode HosV4L2Buffers::V4L2AllocBuffer(int fd, const std::shared_ptr<FrameSpec>& frameSpec){struct v4l2_buffer buf = {};struct v4l2_plane planes[1] = {};
- CAMERA_LOGD("V4L2AllocBuffer\n");
+ CAMERA_LOGD("V4L2AllocBuffer enter\n");+ cyyanl_printf_cmd();if (frameSpec == nullptr) {CAMERA_LOGE("V4L2AllocBuffer frameSpec is NULL\n");return RC_ERROR;}
-switch (memoryType_) {case V4L2_MEMORY_MMAP:// to do somethingbreak;case V4L2_MEMORY_USERPTR:
+ CAMERA_LOGD("V4L2AllocBuffer:V4L2_MEMORY_USERPTR = %d\n", V4L2_MEMORY_USERPTR);buf.type = bufferType_;buf.memory = memoryType_;buf.index = (uint32_t)frameSpec->buffer_->GetIndex();
-if (bufferType_ == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+ CAMERA_LOGD("V4L2AllocBuffer:V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE = %d\n", V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE);buf.m.planes = planes;buf.length = 1;}
diff
内核态打印：kernel/linux/linux-4.19/
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 0842a47c6..8aa60407f 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2902,10 +2902,93 @@ struct uvc_driver uvc_driver = {},};+static void cyyanl_printk_cmd(void)
+{
+ printk("*************************************************************************************");
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYCAP ) = %ld\n", VIDIOC_QUERYCAP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FMT ) = %ld\n", VIDIOC_ENUM_FMT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_FMT ) = %ld\n", VIDIOC_G_FMT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_FMT ) = %ld\n", VIDIOC_S_FMT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_REQBUFS ) = %ld\n", VIDIOC_REQBUFS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYBUF ) = %ld\n", VIDIOC_QUERYBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_FBUF ) = %ld\n", VIDIOC_G_FBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_FBUF ) = %ld\n", VIDIOC_S_FBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_OVERLAY ) = %ld\n", VIDIOC_OVERLAY );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QBUF ) = %ld\n", VIDIOC_QBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_EXPBUF ) = %ld\n", VIDIOC_EXPBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_DQBUF ) = %ld\n", VIDIOC_DQBUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_STREAMON ) = %ld\n", VIDIOC_STREAMON );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_STREAMOFF ) = %ld\n", VIDIOC_STREAMOFF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_PARM ) = %ld\n", VIDIOC_G_PARM );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_PARM ) = %ld\n", VIDIOC_S_PARM );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_STD ) = %ld\n", VIDIOC_G_STD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_STD ) = %ld\n", VIDIOC_S_STD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMSTD ) = %ld\n", VIDIOC_ENUMSTD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMINPUT ) = %ld\n", VIDIOC_ENUMINPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_CTRL ) = %ld\n", VIDIOC_G_CTRL );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_CTRL ) = %ld\n", VIDIOC_S_CTRL );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_TUNER ) = %ld\n", VIDIOC_G_TUNER );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_TUNER ) = %ld\n", VIDIOC_S_TUNER );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_AUDIO ) = %ld\n", VIDIOC_G_AUDIO );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_AUDIO ) = %ld\n", VIDIOC_S_AUDIO );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYCTRL ) = %ld\n", VIDIOC_QUERYCTRL );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYMENU ) = %ld\n", VIDIOC_QUERYMENU );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_INPUT ) = %ld\n", VIDIOC_G_INPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_INPUT ) = %ld\n", VIDIOC_S_INPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_EDID ) = %ld\n", VIDIOC_G_EDID );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_EDID ) = %ld\n", VIDIOC_S_EDID );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_OUTPUT ) = %ld\n", VIDIOC_G_OUTPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_OUTPUT ) = %ld\n", VIDIOC_S_OUTPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMOUTPUT ) = %ld\n", VIDIOC_ENUMOUTPUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_AUDOUT ) = %ld\n", VIDIOC_G_AUDOUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_AUDOUT ) = %ld\n", VIDIOC_S_AUDOUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_MODULATOR ) = %ld\n", VIDIOC_G_MODULATOR );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_MODULATOR ) = %ld\n", VIDIOC_S_MODULATOR );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_FREQUENCY ) = %ld\n", VIDIOC_G_FREQUENCY );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_FREQUENCY ) = %ld\n", VIDIOC_S_FREQUENCY );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_CROPCAP ) = %ld\n", VIDIOC_CROPCAP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_CROP ) = %ld\n", VIDIOC_G_CROP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_CROP ) = %ld\n", VIDIOC_S_CROP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_JPEGCOMP ) = %ld\n", VIDIOC_G_JPEGCOMP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_JPEGCOMP ) = %ld\n", VIDIOC_S_JPEGCOMP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERYSTD ) = %ld\n", VIDIOC_QUERYSTD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_FMT ) = %ld\n", VIDIOC_TRY_FMT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMAUDIO ) = %ld\n", VIDIOC_ENUMAUDIO );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUMAUDOUT ) = %ld\n", VIDIOC_ENUMAUDOUT );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_PRIORITY ) = %ld\n", VIDIOC_G_PRIORITY );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_PRIORITY ) = %ld\n", VIDIOC_S_PRIORITY );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_SLICED_VBI_CAP ) = %ld\n", VIDIOC_G_SLICED_VBI_CAP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_LOG_STATUS ) = %ld\n", VIDIOC_LOG_STATUS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_EXT_CTRLS ) = %ld\n", VIDIOC_G_EXT_CTRLS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_EXT_CTRLS ) = %ld\n", VIDIOC_S_EXT_CTRLS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_EXT_CTRLS ) = %ld\n", VIDIOC_TRY_EXT_CTRLS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FRAMESIZES ) = %ld\n", VIDIOC_ENUM_FRAMESIZES );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FRAMEINTERVALS) = %ld\n", VIDIOC_ENUM_FRAMEINTERVALS);
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_ENC_INDEX ) = %ld\n", VIDIOC_G_ENC_INDEX );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENCODER_CMD ) = %ld\n", VIDIOC_ENCODER_CMD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_ENCODER_CMD ) = %ld\n", VIDIOC_TRY_ENCODER_CMD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_HW_FREQ_SEEK ) = %ld\n", VIDIOC_S_HW_FREQ_SEEK );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_CREATE_BUFS ) = %ld\n", VIDIOC_CREATE_BUFS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_PREPARE_BUF ) = %ld\n", VIDIOC_PREPARE_BUF );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_G_SELECTION ) = %ld\n", VIDIOC_G_SELECTION );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_S_SELECTION ) = %ld\n", VIDIOC_S_SELECTION );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_DECODER_CMD ) = %ld\n", VIDIOC_DECODER_CMD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_TRY_DECODER_CMD ) = %ld\n", VIDIOC_TRY_DECODER_CMD );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_DV_TIMINGS ) = %ld\n", VIDIOC_ENUM_DV_TIMINGS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERY_DV_TIMINGS ) = %ld\n", VIDIOC_QUERY_DV_TIMINGS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_DV_TIMINGS_CAP ) = %ld\n", VIDIOC_DV_TIMINGS_CAP );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_ENUM_FREQ_BANDS ) = %ld\n", VIDIOC_ENUM_FREQ_BANDS );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_DBG_G_CHIP_INFO ) = %ld\n", VIDIOC_DBG_G_CHIP_INFO );
+ printk("cyyanl v4l2 ioctl cmd(VIDIOC_QUERY_EXT_CTRL ) = %ld\n", VIDIOC_QUERY_EXT_CTRL );
+ printk("cyyanl v4l2 ioctl cmd(BASE_VIDIOC_PRIVATE ) = %ld\n", BASE_VIDIOC_PRIVATE );
+ printk("*************************************************************************************");
+}
+static int __init uvc_init(void){int ret;
-
+ printk("cyyanl enter uvc_init\n");
+ cyyanl_printk_cmd();uvc_debugfs_init();ret = usb_register(&uvc_driver.driver);
diff
打印结果对比：VIDIOC_QUERYBUF用户态为0xc0505609，内核态为0xc0585609 还有其他几处命令码也不同。
分析命令码不一致问题，先找出VIDIOC_QUERYBUF用户态和内核态实际编译时所定义的地方差异：
用户态：kernel/linux/patches/linux-5.10/prebuilts/usr/include/linux/videodev2.h +1358
内核态：kernel/linux/linux-4.19/include/uapi/linux/videodev2.h +2361
此时怀疑VIDIOC_QUERYBUF不一致是头文件不同所导致（目前没做修改验证同改为linux-4.19是否可行）。对现有问题求助客户，并在OpenHarmony上寻找有无相似问题。
接下来，调试思路分为2路：
-
同意用户态和内核态的VIDIOC_QUERYBUF
方案：把用户态的0xc0505609改为内核态的0xc0585609
修改点：drivers/peripheral
diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp index d7dd15f..f7254b4 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cpp +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_buffer.cppbuf.m.planes = planes;buf.length = 1;} - CAMERA_LOGD("V4L2_MEMORY_USERPTR Print the cnt: %{public}d\n", buf.index); - - if (ioctl(fd, VIDIOC_QUERYBUF, &buf) < 0) { - CAMERA_LOGE("error: ioctl VIDIOC_QUERYBUF failed: %{public}s\n", strerror(errno)); + if (ioctl(fd, /*VIDIOC_QUERYBUF*/0xc0585609, &buf) < 0) { + CAMERA_LOGE("error: ioctl VIDIOC_QUERYBUF failed.\n");return RC_ERROR;} diff再次运行v4l2_main结果：Signal 4报错
原因分析：此时ioctl(fd, /VIDIOC_QUERYBUF/0xc0585609, &buf) 已经成功了。Signal 4分析可能又是cmd命令码的问题。
此路虽然解决了当前问题，但会有新问题Signal 4，故先暂停。
INFO:main test:allocating display buffer memory INFO:main test:do_mmap: pmem mmap fd 5 ptr 0xf7508000 len 2457600 INFO:V4L2OpenDevice /dev/video10 INFO:V4L2ReqBuffers buffCont 4 INFO:Creatbuffer frameSpec->buffer index == 0 INFO:V4L2AllocBuffer Signal 4 -
分析命令码不一致的根因，并做修改
根因分析：结构体的大小根据32位与64位编译会产生差异，从而影响VIDIOC_QUERYBUF的值。
修改点：修改用户态编译v4l2_buffer结构体的timestamp定义，并将用户态编译的头文件#include <linux/videodev2.h>替换成
修改过的videodev2.h，即#include ”videodev2.h“。（实际操作为把修改后的videodev2.h拷贝到v4l2_main编译目录中）
kernel/linux/linux-4.19/
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h index ba548d7f0..b0fb48f65 100644 --- a/include/uapi/linux/videodev2.h +++ b/include/uapi/linux/videodev2.h @@ -958,13 +958,20 @@ struct v4l2_plane {* Contains data exchanged by application and driver using one of the Streaming* I/O methods.*/ + +struct timeval_user { + long tv_sec; + long tv_usec; +}; +struct v4l2_buffer {__u32 index;__u32 type;__u32 bytesused;__u32 flags;__u32 field; - struct timeval timestamp; + //struct timeval timestamp; + struct timeval_user timestamp;struct v4l2_timecode timecode;__u32 sequence;diffdrivers/peripheral
diff --git a/camera/hal/adapter/chipset/rpi/rpi3/device/camera/src/driver_adapter/main_test/project_v4l2_main.h b/camera/hal/adapter/chipset/rpi/rpi3/device/camera/src/driver_adapter/main_test/project_v4l2_main.h index 00ddea7..962ebc3 100755 --- a/camera/hal/adapter/chipset/rpi/rpi3/device/camera/src/driver_adapter/main_test/project_v4l2_main.h +++ b/camera/hal/adapter/chipset/rpi/rpi3/device/camera/src/driver_adapter/main_test/project_v4l2_main.h @@ -15,7 +15,8 @@#ifndef HOS_CAMERA_PROJET_HARDWARE_H#define HOS_CAMERA_PROJET_HARDWARE_H -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"namespace OHOS::Camera {#define PREVIEW_PIXEL_FORMAT V4L2_PIX_FMT_YUV420 diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_buffer.h b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_buffer.h index 6f45882..a8d6819 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_buffer.h +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_buffer.h @@ -19,7 +19,8 @@#include <mutex>#include <map>#include <cstring> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <sys/ioctl.h>#include "v4l2_common.h"#if defined(V4L2_UTEST) || defined (V4L2_MAIN_TEST) diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_control.h b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_control.h index 5b93f36..05191a7 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_control.h +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_control.h @@ -16,7 +16,8 @@#ifndef HOS_CAMERA_V4L2_CONTROL_H#define HOS_CAMERA_V4L2_CONTROL_H-#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <errno.h>#include <sys/ioctl.h>#include "v4l2_common.h" diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_dev.h b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_dev.h index 10dc9b4..e3b3056 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_dev.h +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_dev.h @@ -19,7 +19,8 @@#include <mutex>#include <thread>#include <vector> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <sys/epoll.h>#include <sys/ioctl.h>#include <sys/types.h> diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_fileformat.h b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_fileformat.h index de892e9..44bb1b4 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_fileformat.h +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_fileformat.h @@ -19,7 +19,8 @@#include <vector>#include <cstring>#include <fcntl.h> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <sys/ioctl.h>#include <sys/stat.h>#include <unistd.h> diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_uvc.h b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_uvc.h index 1a62f37..96c70aa 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_uvc.h +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/include/v4l2_uvc.h @@ -18,7 +18,8 @@#include <thread>#include <fcntl.h>#include <linux/netlink.h> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <sys/ioctl.h>#include <sys/select.h>#include <linux/netlink.h>zz diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp index b351f49..5483b85 100755 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp @@ -22,7 +22,8 @@#include <sys/mman.h>#include <sys/time.h>#include <linux/fb.h> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include "securec.h"#include "v4l2_uvc.h"#include "v4l2_dev.h" diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_stream.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_stream.cpp index 778cf05..96618be 100644 --- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_stream.cpp +++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/src/v4l2_stream.cpp @@ -14,7 +14,8 @@*/#include <cstring> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <sys/ioctl.h>#include "v4l2_stream.h" diff --git a/camera/hal/test/v4l2/include/test_display.h b/camera/hal/test/v4l2/include/test_display.h index d437e26..8e5205e 100644 --- a/camera/hal/test/v4l2/include/test_display.h +++ b/camera/hal/test/v4l2/include/test_display.h @@ -44,7 +44,8 @@#include <errno.h>#include <getopt.h>#include <linux/fb.h> -#include <linux/videodev2.h> +//#include <linux/videodev2.h> +#include "videodev2.h"#include <mutex>#include <pthread.h>#include <stdlib.h> @@ -138,4 +139,4 @@ public:void StartCapture(int streamId, int captureId, bool shutterCallback, bool isStreaming);float calTime(struct timeval start, struct timeval end);}; -#endif \ No newline at end of file +#endif diff再次编译v4l2_main后执行，log无报错。HDMI屏上就显示预览画面。
回过头来再看整个调试流程，发现该摄像头支持YUYV格式和MJPEG格式，查看v4l2_main中默认预览用的是YUYV，改为MJPEG再次调试。
修改点：
diff --git a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
index b351f49..5483b85 100755
--- a/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
+++ b/camera/hal/adapter/platform/v4l2/src/driver_adapter/main_test/v4l2_main.cpp
@@ -394,7 +395,9 @@ void V4L2SetDeviceFormat(DeviceFormat& format, const std::string devname)if (devname == "uvcvideo" || devname == "uvcvideo1") {if (g_isPreviewOnUvc) {
- format.fmtdesc.pixelformat = V4L2_PIX_FMT_YUYV;
+ CAMERA_LOGD("cyyanl enter V4L2SetDeviceFormat : g_isPreviewOnUvc\n");
+ //format.fmtdesc.pixelformat = V4L2_PIX_FMT_YUYV;
+ format.fmtdesc.pixelformat = V4L2_PIX_FMT_MJPEG;format.fmtdesc.width = width;format.fmtdesc.height = height;}
diff
v4l2_main执行结果：该显示异常，目前先不分析MJPEG格式。
到此为止，v4l2_main运行正常，可以预览（预览画面色彩异常与屏幕显示格式有关，暂不做修改）。接下来调试拍照和录像。
执行v4l2_main后，先输入u进行uvc预览，再运行c进行拍照，再运行v进行录像，照片和录像文件生成到当前执行的路径下：
# ls -l *.jpeg
-rwxrw-rw- 1 root 29034400 614400 2013-01-18 15:20 UVC0.jpeg
-rwxrw-rw- 1 root 29034400 614400 2013-01-18 15:20 UVC1.jpeg
-rwxrw-rw- 1 root 29034400 614400 2013-01-18 15:20 UVC2.jpeg
-rwxrw-rw- 1 root 29034400 614400 2013-01-18 15:20 UVC3.jpeg
#
# ls -l *.h264
-rwxrw-rw- 1 root 29034400 85401600 2013-01-18 15:20 uvc.h264
将如上文件导出到电脑端查看：
照片uvc0.jpeg
录像uvc.h264在手机端可查看，播放正常。
附录
/*** struct v4l2_buffer - video buffer info* @index: id number of the buffer* @type: enum v4l2_buf_type; buffer type (type == *_MPLANE for* multiplanar buffers);* @bytesused: number of bytes occupied by data in the buffer (payload);* unused (set to 0) for multiplanar buffers* @flags: buffer informational flags* @field: enum v4l2_field; field order of the image in the buffer* @timestamp: frame timestamp* @timecode: frame timecode* @sequence: sequence count of this frame* @memory: enum v4l2_memory; the method, in which the actual video data is* passed* @offset: for non-multiplanar buffers with memory == V4L2_MEMORY_MMAP;* offset from the start of the device memory for this plane,* (or a "cookie" that should be passed to mmap() as offset)* @userptr: for non-multiplanar buffers with memory == V4L2_MEMORY_USERPTR;* a userspace pointer pointing to this buffer* @fd: for non-multiplanar buffers with memory == V4L2_MEMORY_DMABUF;* a userspace file descriptor associated with this buffer* @planes: for multiplanar buffers; userspace pointer to the array of plane* info structs for this buffer* @length: size in bytes of the buffer (NOT its payload) for single-plane* buffers (when type != *_MPLANE); number of elements in the* planes array for multi-plane buffers** Contains data exchanged by application and driver using one of the Streaming* I/O methods.*/struct v4l2_buffer {__u32 index;__u32 type;__u32 bytesused;__u32 flags;__u32 field;struct timeval timestamp;struct v4l2_timecode timecode;__u32 sequence;/* memory location */__u32 memory;union {__u32 offset;unsigned long userptr;struct v4l2_plane *planes;__s32 fd;} m;__u32 length;__u32 reserved2;__u32 reserved;
}
c
TP
TP驱动模型
主要包含Input模块HDI（Hardware Driver Interface）接口定义及其实现，对上层输入服务提供操作input设备的驱动能力接口，HDI接口主要包括如下三大类：
- InputManager：管理输入设备，包括输入设备的打开、关闭、设备列表信息获取等；
- InputReporter：负责输入事件的上报，包括注册、注销数据上报回调函数等；
- InputController：提供input设备的业务控制接口，包括获取器件信息及设备类型、设置电源状态等。
图 1 INPUT模块HDI接口层框架图
相关目录下源代码目录结构如下所示
/drivers/peripheral/input
├── hal # input模块的hal层代码
│ └── include # input模块hal层内部的头文件
│ └── src # input模块hal层代码的具体实现
├── interfaces # input模块对上层服务提供的驱动能力接口
│ └── include # input模块对外提供的接口定义
├── test # input模块的测试代码
│ └── unittest # input模块的单元测试代码
TP HDF驱动适配
配置适配
关闭linux tp驱动开关，在<rockchip_linux_defconfig>文件中关闭TOUCHSCREEN_GT9XX，具体操作如下，将CONFIG_TOUCHSCREEN_GT9XX=y修改为
# CONFIG_TOUCHSCREEN_GT9XX is not set
makefile
驱动适配
-
在vendor/rockchip/rk3399/hdf_config/khdf/device_info/device_info.hcs修改或增加如下内容
device_touch_chip :: device {device0 :: deviceNode {policy = 0;priority = 130;preload = 0;permission = 0660;moduleName = "HDF_TOUCH_GT911";serviceName = "hdf_touch_gt911_service";deviceMatchAttr = "zsj_gt911_5p5";}} json -
在vendor/rockchip/rk3399/hdf_config/khdf/input/input_config.hcs修改或增加如下内容
busConfig {// 0:i2c 1:spibusType = 0; // I2C通信方式busNum = 7; // cpu对应touch芯片的I2C编号clkGpio = 72; // I2C clk对应的IO引脚编号dataGpio = 71; // I2C data对应的IO引脚标号i2cClkIomux = [0xFF77E004, 0x2]; // I2C [clk引脚对应的复用寄存器，配置为I2C7_clk功能]i2cDataIomux = [0xFF77E000, 0x8000]; // I2C [data引脚对应的复用寄存器，配置为I2C7_DATA功能]}pinConfig {rstGpio = 150; // touch芯片rst对应的IO引脚编号intGpio = 52; // touch芯片int对应的IO引脚编号rstRegCfg = [0xFF77E028, 0x00000000]; // rst引脚对应的复用功能寄存器，配置为普通io口intRegCfg = [0xFF770018, 0x00000000]; // int引脚对应的复用功能寄存器，配置为普通io口} json
FAQ问题
解决触屏横竖反转问题
修改drivers/framework/model/input/driver/touchscreen/touch_gt911.c中的ParsePointData函数，x和y对调即可
InputPinMuxCfg函数修改
static int32_t InputPinMuxCfg(uint32_t regAddr, int32_t regSize, uint32_t regValue)
{uint8_t *base = NULL;uint32_t data = 0;if (regAddr == 0) {HDF_LOGE("%s: regAddr invalid", __func__);return HDF_FAILURE;}HDF_LOGE("regAddr = 0x%x, regSize = 0x%x", regAddr, regSize);base = OsalIoRemap(regAddr, regSize);if (base == NULL) {HDF_LOGE("%s: ioremap failed", __func__);return HDF_FAILURE;}// 写入寄存器前先读出数据，保存原有的配置，方式修改原有的其他引脚功能配置。data = OSAL_READL(base);data |= regValue;OSAL_WRITEL(data, base);OsalIoUnmap((void *)base);return HDF_SUCCESS;
}
c
RK3399引脚GPIOn_KX 编号号确认方法
num = 32n+(K-A)8+X
# GPIO1_B2 = 1 * 32 + (B-A)*8 + 2 = 32 + 8 + 1 = 42
shell
| 功能 | IO名称 | IO编号 |
|---|---|---|
| TP_INT | GPIO1_C4 | 52 |
| TP_RST | GPIO4_C6 | 150 |
| TP_SDA | GPIO2_A7 | 71 |
| TP_SCL | GPIO2_B0 | 72 |
RK3399引脚GPIOn_KX复用功能配置
- GPIO复用功能寄存器基地址FF77_0000
- 找到GPIOn_K复用功能寄存器偏移量
- 确定GPIOn_K复用功能寄存器，基地址+偏移量
- 根据复用功能寄存器介绍，写入对应引脚的复用功能
| 功能 | IO名称 | 复用寄存器地址 | 控制位 | 对应数值 |
|---|---|---|---|---|
| TP_INT | GPIO1_C4 | 0xFF770018 | 9:8 | 2’b00：GPIO |
| TP_RST | GPIO4_C6 | 0xFF77E028 | 13:12 | 2’b00：GPIO |
| TP_SDA | GPIO2_A7 | 0xFF77E000 | 15:14 | 2’b10： i2c7nfc_sda |
| TP_SCL | GPIO2_B0 | 0xFF77E004 | 1:0 | 2’b10： i2c7nfc_scl |
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