2440 linux lcd

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include <linux/fb.h>

static struct fb_info *fb_info;

static int __init lcd_init(void) {
    struct fb_var_screeninfo vinfo;
    struct fb_fix_screeninfo finfo;

    // 初始化fb_info结构体
    fb_info = framebuffer_alloc(0, NULL);
    if (!fb_info) {
        printk(KERN_ERR "Failed to allocate framebuffer\n");
        return -ENOMEM;
    }

    // 设置显示参数
    memset(&vinfo, 0, sizeof(vinfo));
    vinfo.xres = 800;
    vinfo.yres = 480;
    vinfo.bits_per_pixel = 32;

    memset(&finfo, 0, sizeof(finfo));
    finfo.smem_len = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;

    // 注册帧缓冲设备
    if (register_framebuffer(fb_info)) {
        printk(KERN_ERR "Failed to register framebuffer\n");
        framebuffer_release(fb_info);
        return -EIO;
    }

    printk(KERN_INFO "LCD driver initialized\n");
    return 0;
}

static void __exit lcd_exit(void) {
    unregister_framebuffer(fb_info);
    framebuffer_release(fb_info);
    printk(KERN_INFO "LCD driver exited\n");
}

module_init(lcd_init);
module_exit(lcd_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Simple LCD driver");