LCD驱动分析(二)帧缓冲设备作为平台设备

参考：S3C2440 LCD驱动(FrameBuffer)实例开发<一>

　　   S3C2440 LCD驱动(FrameBuffer)实例开发<二>

1.平台设备注册

1.1在linux/arch/arm/plat-samsung/dev-fb.c中定义平台设备。

 static struct resource s3c_fb_resource[] = {
     [] = {
         .start = S3C_PA_FB,
         .end   = S3C_PA_FB + SZ_16K - ,
         .flags = IORESOURCE_MEM,
     },
     [] = {
         .start = IRQ_LCD_VSYNC,
         .end   = IRQ_LCD_VSYNC,
         .flags = IORESOURCE_IRQ,
     },
     [] = {
         .start = IRQ_LCD_FIFO,
         .end   = IRQ_LCD_FIFO,
         .flags = IORESOURCE_IRQ,
     },
     [] = {
         .start = IRQ_LCD_SYSTEM,
         .end   = IRQ_LCD_SYSTEM,
         .flags = IORESOURCE_IRQ,
     },
 };
 
 struct platform_device s3c_device_fb = {
     .name          = "s3c-fb",
     .id          = -,
     .num_resources      = ARRAY_SIZE(s3c_fb_resource),
     .resource      = s3c_fb_resource,
     .dev.dma_mask      = &s3c_device_fb.dev.coherent_dma_mask,
     .dev.coherent_dma_mask = 0xffffffffUL,
 };

1.2 在linux/arch/arm/mach-s3c64xx/mach-smdk6410.c中定义的指针数组指向dev-fb.c中的平台设备并注册

static struct platform_device *smdk6410_devices[] __initdata = {
 
　　......
 
　　&s3c_device_fb,
 
　　......
 
}

static void __init smdk6410_machine_init(void)

　　-->s3c_fb_set_platdata(&smdk6410_lcd_pdata);

　　-->platform_add_devices(smdk6410_devices, ARRAY_SIZE(smdk6410_devices));

　　　　-->platform_device_register(&s3c_device_fb);

2. 在drivers/video/samsung/s3cfb.c中注册平台驱动。

 static struct platform_driver s3cfb_driver = {
     .probe        = s3cfb_probe,
     .remove        = s3cfb_remove,
     .suspend    = s3cfb_suspend,
     .resume        = s3cfb_resume,
         .driver        = {
         .name    = "s3c-fb",
         .owner    = THIS_MODULE,
     },
 };
 
 int __devinit s3cfb_init(void)
 {
     return platform_driver_register(&s3cfb_driver);
 }

3. 当平台设备与驱动匹配后，调用s3cfb_probe()函数，调用register_framebuffer()函数。

static int __init s3cfb_probe(struct platform_device *pdev)

　　-->register_framebuffer()//在/dev/目录下创建fb*设备节点