linux-3.4.2 s5pv210 LCD驱动移植 overlay（二）

多窗口 overlay

移植lcd驱动后，发现/dev/下只有一个fb0，但是s3c-fb支持5个window叠加，应该有5个设备节点。

分析代码：

s3c-fb.c

调用关系

static int __devinit s3c_fb_probe(struct platform_device *pdev)

s3c_fb_probe_win(sfb, win, fbdrv->win[win], &sfb->windows[win]);

/* run the check_var and set_par on our configuration. */
printk("win:%d,framebuffer:0x%08lx\n",win_no,fbinfo->fix.smem_start);
register_framebuffer(fbinfo);

而在注册之前，判断s3c_fb_platdata是不是又win[x]的信息，如果没有则不能注册。

	/* we have the register setup, start allocating framebuffers */

	for (win = 0; win < fbdrv->variant.nr_windows; win++) {
		if (!pd->win[win])
			continue;

		if (!pd->win[win]->win_mode.pixclock)
			s3c_fb_missing_pixclock(&pd->win[win]->win_mode);

		ret = s3c_fb_probe_win(sfb, win, fbdrv->win[win],
				       &sfb->windows[win]);
		if (ret < 0) {
			dev_err(dev, "failed to create window %d\n", win);
			for (; win >= 0; win--)
				s3c_fb_release_win(sfb, sfb->windows[win]);
			goto err_pm_runtime;
		}
	}

修改s3c_fb_platdata，添加win[1]、win[2]、win[3]、win[4]，如下：

static struct s3c_fb_platdata smdkv210_lcd0_pdata __initdata = {
	.win[0]		= &smdkv210_fb_win0,
	.win[1]		= &smdkv210_fb_win1,
	.win[2]		= &smdkv210_fb_win2,
	.win[3]		= &smdkv210_fb_win3,
	.win[4]		= &smdkv210_fb_win4,
	.vidcon0	= (4<<6) | (1<<4)|(1<<0)|(1<<1),//VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
	.vidcon1	=1<<5 | 1<<6, //VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
	.setup_gpio	= s5pv210_fb_gpio_setup_24bpp,
};

当然这几个窗口的信息都是一样的：

static struct s3c_fb_pd_win smdkv210_fb_win0 = {
	.win_mode = {
		.left_margin	= 45,//46-1
		.right_margin	= 209,//210-1
		.upper_margin	= 22,//23-1
		.lower_margin	= 21,//22-1
		.hsync_len	= 39,
		.vsync_len	= 19,
		.xres		= 800,
		.yres		= 480,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};
static struct s3c_fb_pd_win smdkv210_fb_win1 = {
	.win_mode = {
		.left_margin	= 45,//46-1
		.right_margin	= 209,//210-1
		.upper_margin	= 22,//23-1
		.lower_margin	= 21,//22-1
		.hsync_len	= 39,
		.vsync_len	= 19,
		.xres		= 800,
		.yres		= 480,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};
static struct s3c_fb_pd_win smdkv210_fb_win2 = {
	.win_mode = {
		.left_margin	= 45,//46-1
		.right_margin	= 209,//210-1
		.upper_margin	= 22,//23-1
		.lower_margin	= 21,//22-1
		.hsync_len	= 39,
		.vsync_len	= 19,
		.xres		= 800,
		.yres		= 480,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};
static struct s3c_fb_pd_win smdkv210_fb_win3 = {
	.win_mode = {
		.left_margin	= 45,//46-1
		.right_margin	= 209,//210-1
		.upper_margin	= 22,//23-1
		.lower_margin	= 21,//22-1
		.hsync_len	= 39,
		.vsync_len	= 19,
		.xres		= 800,
		.yres		= 480,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};
static struct s3c_fb_pd_win smdkv210_fb_win4 = {
	.win_mode = {
		.left_margin	= 45,//46-1
		.right_margin	= 209,//210-1
		.upper_margin	= 22,//23-1
		.lower_margin	= 21,//22-1
		.hsync_len	= 39,
		.vsync_len	= 19,
		.xres		= 800,
		.yres		= 480,
	},
	.max_bpp	= 32,
	.default_bpp	= 24,
};

通过上面的修改：

在dev下可以看到有5个fb的设备节点

测试代码 ：

第0、1、2、3分别显示出来，叠加的效果，然后第4层滚动的效果

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define WIN_MAX 5
const char * fb_file_path[5] = {
"/dev/fb0",
"/dev/fb1",
"/dev/fb2",
"/dev/fb3",
"/dev/fb4"
};
int color[5] = {
0x50ffffff,
0x50ff0000,
0x5000ff00,
0x500000ff,
0x50000000,
};
int main(int argc, char *argv[])
{
	int i,j,k;
	int ret;
	struct fb_var_screeninfo var;
	int    blank;
	int fd[5];
	int width;
	int height;
	int *p[5];

	/* open framebuffer */
	for(i=0; i

效果：