1.framebuffer接口层(fbmem.c)
功能:给用户提供接口
fbmem_init ),"fb",&fb_fops)
/*2.创建一个设备类*/
fb_class = class_create(THIS_MODULE, "graphics");
static const struct file_operations fb_fops = {
.owner = THIS_MODULE,
.read = fb_read,
.write = fb_write,
.unlocked_ioctl = fb_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = fb_compat_ioctl,
#endif
.mmap = fb_mmap,
.open = fb_open,
.release = fb_release,
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
.get_unmapped_area = get_fb_unmapped_area,
#endif
#ifdef CONFIG_FB_DEFERRED_IO
.fsync = fb_deferred_io_fsync,
#endif
};
/*2.创建一个设备类*/
fb_class = class_create(THIS_MODULE, "graphics");
static const struct file_operations fb_fops = {
.owner = THIS_MODULE,
.read = fb_read,
.write = fb_write,
.unlocked_ioctl = fb_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = fb_compat_ioctl,
#endif
.mmap = fb_mmap,
.open = fb_open,
.release = fb_release,
#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
.get_unmapped_area = get_fb_unmapped_area,
#endif
#ifdef CONFIG_FB_DEFERRED_IO
.fsync = fb_deferred_io_fsync,
#endif
};
2.从应用层往下分析
open
app);
ioctl
app;
break;
}
break;
}
搜索registered_fb数组,看在哪里被设置了?
s3c_fb_probe(; win < S3C_FB_MAX_WIN; win++) {
/*设置一个硬件窗口:一个窗口就是一个帧缓冲设备,一个帧缓冲设备用struct fb_info来描述*/
s3c_fb_probe_win //drivers\video\s3c-fb.c
/*构建fb_info:表示一个帧缓冲设备*/
/*设置fb_info*/
/*设置它的可变参数*/
/*设置它的固定参数*/
/*设置它的操作方法*/
/*注册一个fb_info结构体*/
register_framebuffer(struct fb_info *fb_info)
/*将fb_info加入数组项*/
registered_fb[i] = fb_info;
/*设置一个硬件窗口:一个窗口就是一个帧缓冲设备,一个帧缓冲设备用struct fb_info来描述*/
s3c_fb_probe_win //drivers\video\s3c-fb.c
/*构建fb_info:表示一个帧缓冲设备*/
/*设置fb_info*/
/*设置它的可变参数*/
/*设置它的固定参数*/
/*设置它的操作方法*/
/*注册一个fb_info结构体*/
register_framebuffer(struct fb_info *fb_info)
/*将fb_info加入数组项*/
registered_fb[i] = fb_info;
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