LCD驱动分析(二)帧缓冲设备作为平台设备

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。

 1 static struct resource s3c_fb_resource[] = {
 2     [0] = {
 3         .start = S3C_PA_FB,
 4         .end   = S3C_PA_FB + SZ_16K - 1,
 5         .flags = IORESOURCE_MEM,
 6     },
 7     [1] = {
 8         .start = IRQ_LCD_VSYNC,
 9         .end   = IRQ_LCD_VSYNC,
10         .flags = IORESOURCE_IRQ,
11     },
12     [2] = {
13         .start = IRQ_LCD_FIFO,
14         .end   = IRQ_LCD_FIFO,
15         .flags = IORESOURCE_IRQ,
16     },
17     [3] = {
18         .start = IRQ_LCD_SYSTEM,
19         .end   = IRQ_LCD_SYSTEM,
20         .flags = IORESOURCE_IRQ,
21     },
22 };
23 
24 struct platform_device s3c_device_fb = {
25     .name          = "s3c-fb",
26     .id          = -1,
27     .num_resources      = ARRAY_SIZE(s3c_fb_resource),
28     .resource      = s3c_fb_resource,
29     .dev.dma_mask      = &s3c_device_fb.dev.coherent_dma_mask,
30     .dev.coherent_dma_mask = 0xffffffffUL,
31 };

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。

 1 static struct platform_driver s3cfb_driver = {
 2     .probe        = s3cfb_probe,
 3     .remove        = s3cfb_remove,
 4     .suspend    = s3cfb_suspend,
 5     .resume        = s3cfb_resume,
 6         .driver        = {
 7         .name    = "s3c-fb",
 8         .owner    = THIS_MODULE,
 9     },
10 };
11 
12 int __devinit s3cfb_init(void)
13 {
14     return platform_driver_register(&s3cfb_driver);
15 }

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

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原文地址：https://www.cnblogs.com/yangjiguang/p/6080272.html