116 lines
2.5 KiB
C
Executable file
116 lines
2.5 KiB
C
Executable file
#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#define DRIVER_NAME "oled_driver"
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#define DEVICE_NAME "oled"
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#define DEVICE_TREE_COMP "coosea,oled"
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/* static struct platform_device *oled_device;
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//const struct device_attribute dev_attr_oled;
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static int oled_open(struct inode *inode, struct file *filp)
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{
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printk(KERN_INFO "OLED device opened\n");
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return 0;
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}
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static int oled_release(struct inode *inode, struct file *filp)
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{
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printk(KERN_INFO "OLED device closed\n");
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return 0;
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}
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static struct file_operations oled_fops = {
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.owner = THIS_MODULE,
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.open = oled_open,
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.release = oled_release,
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}; */
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/* drv-add oled sysfs-pengzhipeng-20230306-start */
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static ssize_t oled_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int count = 0;
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count = snprintf(buf, PAGE_SIZE, "oled screens");
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return count;
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}
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static ssize_t oled_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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return size;
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}
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static DEVICE_ATTR(oled, 0664, oled_show, oled_store);
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static int oled_probe(struct platform_device *pdev)
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{
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int err = 0;
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printk(KERN_INFO "OLED probe function called\n");
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err = device_create_file(&pdev->dev, &dev_attr_oled);
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if (err) {
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pr_err("sys file creation failed\n");
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return -ENODEV;
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}
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return 0;
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}
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static int oled_remove(struct platform_device *pdev)
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{
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printk(KERN_INFO "OLED remove function called\n");
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return 0;
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}
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static const struct of_device_id oled_of_match[] = {
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{ .compatible = DEVICE_TREE_COMP, },
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{},
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};
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static struct platform_driver oled_platform_driver = {
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.probe = oled_probe,
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.remove = oled_remove,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(oled_of_match),
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},
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};
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MODULE_DEVICE_TABLE(of, oled_of_match);
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static int __init oled_driver_init(void)
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{
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int ret = 0;
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printk(KERN_INFO "OLED driver initializing\n");
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ret = platform_driver_register(&oled_platform_driver);
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if (ret < 0) {
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printk(KERN_ERR "failed to register platform driver\n");
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return ret;
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}
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return 0;
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}
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static void __exit oled_driver_exit(void)
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{
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printk(KERN_INFO "OLED driver exiting\n");
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platform_driver_unregister(&oled_platform_driver);
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}
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module_init(oled_driver_init);
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module_exit(oled_driver_exit);
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MODULE_AUTHOR("zhangchao");
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MODULE_LICENSE("GPL");
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