问将platform_driver和i2c_driver相结合的内核驱动程序

EN

#define MODULE_NAME     "lcd"
static void lcd_hw_setup(void)
{ ...  }
static int lcd_open(struct inode *inode, struct file *file)
{ ... }
static ssize_t lcd_write (struct file *file, const char *buf, size_t     count, loff_t *ppos)
{ ... }
static int lcd_close(struct inode *inode, struct file *file)
{ ... }
/* declare & initialize file_operations structure */
static const struct file_operations lcd_dev_fops = {
    .owner = THIS_MODULE,
    .open = lcd_open,
    .write = lcd_write,
    .release = lcd_close
};
/* declare & initialize miscdevice structure */
static struct miscdevice lcd_misc = {
    .minor = MISC_DYNAMIC_MINOR, /* major = 10 assigned by the misc framework */
    .name = MODULE_NAME, /* /dev/lcd */
    .fops = &lcd_dev_fops,
};
static int lcd_probe(struct platform_device *pdev)
{
    struct device *dev;
    pr_info(MODULE_NAME ": lcd_probe init\n");
    /* Register the misc device with the kernel */
    misc_register(&lcd_misc);
    dev = &pdev->dev;
    /* gpiod_get calls to get gpios from DTS */
    lcd_hw_setup();
    pr_info(MODULE_NAME ": lcd_probe ok\n");
    return 0;
}
static int lcd_remove(struct platform_device *pdev)
{
    pr_info(MODULE_NAME ": lcd_remove\n");
    /* Release gpio resources */
    ... 
    /* Unregister the device with the kernel */
    misc_deregister(&lcd_misc);
    return 0;
}
/* declare a list of devices supported by this driver */
static const struct of_device_id lcd_of_ids[] = {
    { .compatible = "my-lcd" },
    { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lcd_of_ids);
/* declare & initialize platform_driver structure */
static struct platform_driver lcd_pdrv = {
    .probe = lcd_probe,
    .remove = lcd_remove,
    .driver = {
        .name = "my-lcd", /* match with compatible */
        .of_match_table = lcd_of_ids,
        .owner = THIS_MODULE,
    },
};
/* register platform driver */
module_platform_driver(lcd_pdrv);