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[] = {
    [0] = {
        .start = S3C_PA_FB,
        .end   = S3C_PA_FB + SZ_16K - 1,
        .flags = IORESOURCE_MEM,
    },
    [1] = {
        .start = IRQ_LCD_VSYNC,
        .end   = IRQ_LCD_VSYNC,
        .flags = IORESOURCE_IRQ,
    },
    [2] = {
        .start = IRQ_LCD_FIFO,
        .end   = IRQ_LCD_FIFO,
        .flags = IORESOURCE_IRQ,
    },
    [3] = {
        .start = IRQ_LCD_SYSTEM,
        .end   = IRQ_LCD_SYSTEM,
        .flags = IORESOURCE_IRQ,
    },
};

struct platform_device s3c_device_fb = {
    .name          = "s3c-fb",
    .id          = -1,
    .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