内核中加载摄像头驱动的移植方法

内核中加载摄像头驱动的移植方法  

2009-12-25 14:09:36|  分类： Linux系统移植 |  标签： |字号大中小 

一、移植gspcav1-20071224
gspcav1-20071224 下载地址:%7Ealien/slackbuilds/gspcav1/build/gspcav1-20071224.tar.gz

FS2410开发板上移植的是Linux-2.6.22.6内核，USB及CS8900A均能工作，由于linux-2.6.22.6/drivers/usb 目录下没有 media 目录，故移植步骤如下：

步骤一、在 linux-2.6.22.6/drivers/usb 目录下新建 media 目录，将gspcav1-20071224.tar.gz copy 到 media 下并解压。

步骤二、为了使media 编译进内核，需修改linux-2.6.22.6/drivers/usb 目录下的Kconfig、Makefile 文件。
[linux@weijing usb]$ pwd
/work/kernel/linux-2.6.22.6/drivers/usb

[linux@weijing usb]$ vi Kconfig
添加
source "drivers/usb/media/Kconfig"

[linux@weijing usb]$ vi Makefile
添加
obj-$(CONFIG_USB_SPCA5XX)        += media/

步骤三、为加载gspcav1-20071224驱动编译选项，在 media 下新建 Kconfig、Makefile 文件。

[linux@weijing media]$ pwd
/work/kernel/linux-2.6.22.6/drivers/usb/media
[linux@weijing media]$ vim Kconfig

#
# USB Multimedia device configuration
#
comment "USB Multimedia devices"
        depends on USB

config USB_SPCA5XX
        tristate "USB SPCA5XX Sunplus/Vimicro/Sonix jpeg Cameras"
        depends on USB && VIDEO_DEV
        ---help---
          Say Y or M here if you want to use one of these webcams:

          The built-in microphone is enabled by selecting USB Audio support.

          This driver uses the Video For Linux API. You must say Y or M to
          "Video For Linux" (under Character Devices) to use this driver.
          Information on this API and pointers to "v4l" programs may be found
          at .

          To compile this driver as a module, choose M here: the
          module will be called spca5xx.

[linux@weijing media]$ vim Makefile
#
# Makefile for USB Media drivers
#

obj-$(CONFIG_USB_SPCA5XX)   += gspcav1-20071224/

步骤四、修改 gspcav1-20071224 的 Makefile

[linux@weijing gspcav1-20071224]$ pwd
/work/kernel/linux-2.6.22.6/drivers/usb/media/gspcav1-20071224
[linux@weijing gspcav1-20071224]$ vi Makefile

gspca-objs := gspca_core.o decoder/gspcadecoder.o
obj-$(CONFIG_USB_SPCA5XX) += gspca.o

clean:
        rm -f *.[oas] .*.flags *.ko .*.cmd .*.d .*.tmp *.mod.c
        rm -rf .tmp_versions

步骤五、编译内核
（1）Device Drivers   --->
            Multimedia devices   --->
                <*>Video For Linux
（2）Device Drivers   --->
            USB support   --->
              Support for Host-side USB
              --- USB Host Controller Drivers
             OHCI HCD support
（3）--- USB Multimedia devices
     USB SPCA5XX Sunplus/Vimicro/Sonix jpeg Cameras

此时，可能会提示 gspca_core.c 的一些轻微错误，稍作修改即可：
//static const char gspca_version[] = GSPCA_VERSION;
static const char gspca_version[] = "00.60.00";

把新生成的 zImage 烧进开发板，重启。插上中星微芯片的摄像头，命令行出现

# usb 1-1: new full speed USB device using s3c2410-ohci and address 2          
usb 1-1: configuration #1 chosen from 1 choice                                 
drivers/usb/media/gspcav1-20071224/gspca_core.c: USB GSPCA camera found.(ZC3XX)

说明移植的驱动已经能识别设备，如果udev安装好的话，设备名所在路径 /dev/video0。

 

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