build-imxboard.git

File was renamed from bsp/drivers/x86_64/ldd3_ioctl.c
			@@ -1,50 +1,33 @@
			/*
			* Copyright (C) 2024 LingYun IoT System Studio
			* Author: Guo Wenxue <guowenxue@gmail.com>
			*
			* A character skeleton driver example in linux kernel.
			*/

			#include <linux/module.h>
			#include <linux/init.h>
			#include <linux/kernel.h> /* printk() */
			#include <linux/slab.h> /* kmalloc() */
			#include <linux/fs.h> /* everything... */
			#include <linux/errno.h> /* error codes */
			#include <linux/types.h> /* size_t */
			#include <linux/cdev.h> /* cdev */
			#include <linux/fcntl.h> /* O_ACCMODE */
			#include <linux/uaccess.h> /* copy__user /
			#include <linux/slab.h> /* kmalloc() */
			#include <linux/version.h> /* kernel version code */
			#include <linux/uaccess.h> /* copy_from/to_user() */
			#include <linux/moduleparam.h>

			#if LINUX_VERSION_CODE < KERNEL_VERSION(5,0,0)
			#define access_ok_wrapper(type,arg,cmd) access_ok(type, arg, cmd)
			#else
			#define access_ok_wrapper(type,arg,cmd) access_ok(arg, cmd)
			#endif

			/* ioctl definitions, use 'z' as magic number */
			#define CHRDEV_IOC_MAGIC 'z'
			#define CHRDEV_IOCRESET _IO(CHRDEV_IOC_MAGIC, 0)
			#define CHRDEV_IOCSET _IOW(CHRDEV_IOC_MAGIC, 1, int)
			#define CHRDEV_IOCGET _IOR(CHRDEV_IOC_MAGIC, 2, int)
			#define CHRDEV_IOC_MAXNR 3

			/* device name and major number */
			#define DEV_NAME "chrdev"
			#define DEV_SIZE 1024
			#define CONFIG_AUTODEV 1 /* Auto create device node in driver or not */

			//#define DEV_MAJOR 79
			#ifndef DEV_MAJOR
			#define DEV_MAJOR 0
			#endif

			int dev_major = DEV_MAJOR;
			int dev_major = 0;
			module_param(dev_major, int, S_IRUGO);

			#define BUF_SIZE 1024
			typedef struct chrdev_s
			{
			struct cdev cdev;
			#ifdef CONFIG_AUTODEV
			struct class *class;
			struct device *device;
			#endif
			char data; / data buffer */
			uint32_t size; /* data buffer size */
			uint32_t bytes; /* data bytes in the buffer */
			@@ -109,19 +92,29 @@
			return rv;
			}

			/* The ioctl() implementation */
			long chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
			#if LINUX_VERSION_CODE < KERNEL_VERSION(5,0,0)
			#define access_ok_wrapper(type,arg,cmd) access_ok(type, arg, cmd)
			#else
			#define access_ok_wrapper(type,arg,cmd) access_ok(arg, cmd)
			#endif

			/* ioctl definitions, use 'c' as magic number */
			#define CHR_MAGIC 'c'
			#define CHR_MAXNR 2
			#define CMD_READ _IOR(CHR_MAGIC, 0, int)
			#define CMD_WRITE _IOW(CHR_MAGIC, 1, int)

			static long chrdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
			{
			struct chrdev_s *dev = file->private_data;
			int rv, data;
			size_t bytes = sizeof(data);
			static int value = 0xdeadbeef;
			int rv = 0;

			/*
			* extract the type and number bitfields, and don't decode
			* wrong cmds: return ENOTTY (inappropriate ioctl) before access_ok()
			*/
			if (_IOC_TYPE(cmd) != CHRDEV_IOC_MAGIC) return -ENOTTY;
			if (_IOC_NR(cmd) > CHRDEV_IOC_MAXNR) return -ENOTTY;
			if (_IOC_TYPE(cmd) != CHR_MAGIC) return -ENOTTY;
			if (_IOC_NR(cmd) > CHR_MAXNR) return -ENOTTY;

			/*
			* the direction is a bitmask, and VERIFY_WRITE catches R/W transfers.
			@@ -132,32 +125,26 @@
			rv = !access_ok_wrapper(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd));
			else if (_IOC_DIR(cmd) & _IOC_WRITE)
			rv = !access_ok_wrapper(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
			if (rv) return -EFAULT;

			if (rv)
			return -EFAULT;

			switch(cmd) {
			case CHRDEV_IOCRESET:
			dev->bytes = 0;
			memset(dev->data, 0, dev->size);
			rv = 0;
			case CMD_READ:
			if (copy_to_user((int __user *)arg, &value, sizeof(value)))
			return -EFAULT;
			break;

			/* Last 4 bytes in the buffer used to save ioctl() data*/
			case CHRDEV_IOCSET:
			rv = __get_user(data, (int __user *)arg);
			if( !rv )
			memcpy(&dev->data[dev->size-bytes], &data, bytes);
			break;

			case CHRDEV_IOCGET:
			memcpy(&data, &dev->data[dev->size-bytes], bytes);
			rv = __put_user(data, (int __user *)arg);
			case CMD_WRITE:
			if (copy_from_user(&value, (int __user *)arg, sizeof(value)))
			return -EFAULT;
			break;

			default:
			return -ENOTTY;
			return -EINVAL;
			}

			return rv;
			return 0;
			}

			static int chrdev_open (struct inode inode, struct file file)
			@@ -183,8 +170,8 @@
			.open = chrdev_open, /* open() implementation */
			.read = chrdev_read, /* read() implementation */
			.write = chrdev_write, /* write() implementation */
			.release = chrdev_close, /* close() implementation */
			.unlocked_ioctl = chrdev_ioctl, /* ioctl() implementation */
			.release = chrdev_close, /* close() implementation */
			};

			static int __init chrdev_init(void)
			@@ -193,17 +180,17 @@
			int rv;

			/* malloc and initial device read/write buffer */
			dev.data = kmalloc(DEV_SIZE, GFP_KERNEL);
			dev.data = kmalloc(BUF_SIZE, GFP_KERNEL);
			if( !dev.data )
			{
			printk(KERN_ERR " %s driver kmalloc() failed\n", DEV_NAME);
			return -ENOMEM;
			}
			dev.size = DEV_SIZE;
			dev.size = BUF_SIZE;
			dev.bytes = 0;
			memset(dev.data, 0, dev.size);

			/* dynamic alloc device node major number if not set */
			/* allocate device number */
			if(0 != dev_major)
			{
			devno = MKDEV(dev_major, 0);
			@@ -221,9 +208,11 @@
			return -ENODEV;
			}

			/* setup and register cdev into kernel */
			/* initialize cdev and setup fops */
			cdev_init(&dev.cdev, &chrdev_fops);
			dev.cdev.owner = THIS_MODULE;

			/* register cdev to linux kernel */
			rv = cdev_add(&dev.cdev, devno, 1);
			if( rv )
			{
			@@ -232,7 +221,6 @@
			goto failed1;
			}

			#ifdef CONFIG_AUTODEV
			/* create device node in user space */
			#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 5, 0)
			dev.class = class_create(DEV_NAME);
			@@ -244,25 +232,22 @@
			goto failed2;
			}

			dev.device = device_create(dev.class, NULL, MKDEV(dev_major, 0), NULL, DEV_NAME);
			dev.device = device_create(dev.class, NULL, MKDEV(dev_major, 0), NULL, "%s%d", DEV_NAME, 0);
			if( !dev.device )
			{
			rv = -ENODEV;
			printk(KERN_ERR "%s driver create device failed\n", DEV_NAME);
			goto failed3;
			}
			#endif

			printk(KERN_INFO "%s driver on major[%d] installed.\n", DEV_NAME, dev_major);
			return 0;

			#ifdef CONFIG_AUTODEV
			failed3:
			class_destroy(dev.class);

			failed2:
			cdev_del(&dev.cdev);
			#endif

			failed1:
			unregister_chrdev_region(devno, 1);
			@@ -274,10 +259,8 @@

			static void __exit chrdev_exit(void)
			{
			#ifdef CONFIG_AUTODEV
			device_del(dev.device);
			class_destroy(dev.class);
			#endif

			cdev_del(&dev.cdev);
			unregister_chrdev_region(MKDEV(dev_major,0), 1);