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 <sys/types.h>#include <sys/stat.h>#include <sys/ioctl.h>#include <sys/mman.h>#include <fcntl.h>#include <stdio.h>#include <string.h>#include <linux/fb.h>#define WIN_MAX 5const 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<WIN_MAX; i++){fd[i] = open(fb_file_path[i], O_RDWR);if( fd[i] < 0 ){printf("open %s failed\n", fb_file_path[i]);goto end;}printf("open %s success:%d\n", fb_file_path[i],fd[i]);}ret = ioctl(fd[0], FBIOGET_VSCREENINFO, &var);if(ret < 0){printf("ioctl %s FBIOGET_VSCREENINFO failed\n", fb_file_path[0]);goto end;}width = var.xres;height = var.yres;printf("width:%d,height:%d\n",width, height);printf("set screeninfo ok\n");for(i=0; i<WIN_MAX; i++){p[i] = (int *)mmap(NULL, width * height * 4, PROT_READ|PROT_WRITE, MAP_SHARED, fd[i], 0);if((p[i] == NULL) || (p[i] == -1)){printf("the mmap:%d is NULL\n",i);goto end;}}for(k = 0; k < WIN_MAX; k++){for(i = 0; i < height - (k * 100); i++)for(j = 0; j < width; j++){p[k][i * width + j] = color[k];}printf("draw %d, 0x%08lx\n",k, color[k]);}while(1){for(i = 0; i < height; i++){for(j = 0; j < width; j++){p[4][i * width + j] = 0x50ff0000;}usleep(1000);}for(i = 0; i < height; i++){for(j = 0; j < width; j++){p[4][i * width + j] = 0x00000000;}usleep(1000);}}end:return 0;}

效果：