Camera driver 移植

linux kernel 2.6.27中在/drivers/media/video/gspca下集成了一个通用的webCamera driver.但这个driver没有解码功能。

网上下载的gspcav1-20071224.tar.gz含有decode 功能，可以将Camera收集到的jpeg数据流解码为RGB565,YUV420等，还可以实现其他编解码的转换。

下面是将gspcav1-20071224.tar.gz移植到linux kernel 2.6.27中的步骤：

1. 下载gspcav1-20071224.tar.gz 和补丁文件gspca_kernel_2.6.27.diff

2.解压gspcav1-20071224.tar.gz，进入解压后的目录。拷贝gspca_kernel_2.6.27.diff到该目录。

3.在当前目录下打补丁：执行命令  patch -p1<gspca_kernel_2.6.27.diff

4.在kernel的drivers/usb下新建一个目录media ， 将2中的目录拷贝到media 下，在media目录下为该driver 写Kconfig 和Makefile.

5.在usb 的Kconfig 和Makefile 下为该driver添加新命令。Kconfig 中添加：source "drivers/usb/meida/Kconfig"；Makefile中添加：obj-$(CONFIG_USB_SPCA5XX)+=media/

 

步骤4中的Kconfig内容为：

#
# 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 <file:Documentation/video4linux/API.html>.

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

步骤4中的Makefile内容为：

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