圆形显示屏 linux驱动

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>

static struct fb_info *my_fb_info;

static int my_fb_probe(struct platform_device *pdev) {
    // 初始化帧缓冲信息结构体
    my_fb_info = framebuffer_alloc(sizeof(struct my_fb_struct), NULL);
    if (!my_fb_info)
        return -ENOMEM;

    // 设置帧缓冲参数
    my_fb_info->fbops = &my_fb_ops;
    my_fb_info->fix = my_fb_fix;
    my_fb_info->var = my_fb_var;
    my_fb_info->screen_base = dma_alloc_coherent(NULL, screensize, &my_fb_info->fix.smem_start, GFP_KERNEL);

    // 注册帧缓冲设备
    register_framebuffer(my_fb_info);

    return 0;
}

static int __exit my_fb_remove(struct platform_device *pdev) {
    unregister_framebuffer(my_fb_info);
    framebuffer_release(my_fb_info);
    return 0;
}

static struct platform_driver my_fb_driver = {
    .probe = my_fb_probe,
    .remove = __exit_p(my_fb_remove),
    .driver = {
        .name = "my_fb",
    },
};

module_platform_driver(my_fb_driver);

MODULE_LICENSE("GPL");