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：