Driver:IGKBoard-All: Add x86_64 linux driver
Signed-off-by: guowenxue <guowenxue@gmail.com>
New file |
| | |
| | | # Linux driver build kernel source code path on X86 server |
| | | KERNAL_DIR ?= /lib/modules/$(shell uname -r)/build |
| | | |
| | | ARCH=${shell uname -p} |
| | | |
| | | # Fix bug: module verification failed: signature and/or required key missing - tainting kernel |
| | | CONFIG_MODULE_SIG=n |
| | | |
| | | # Linux kernel modules |
| | | obj-m += ldd1_hello.o |
| | | obj-m += ldd2_chrdev.o |
| | | obj-m += ldd3_ioctl.o |
| | | |
| | | modules: |
| | | $(MAKE) -C $(KERNAL_DIR) M=$(shell pwd) modules |
| | | @make clear |
| | | |
| | | clear: |
| | | @rm -f *.o .*.cmd *.cmd *.mod *.mod.c |
| | | @rm -rf *~ core .depend .tmp_versions Module.symvers modules.order -f |
| | | @rm -f .*ko.cmd .*.o.cmd .*.o.d |
| | | @rm -f *.unsigned |
| | | |
| | | clean: |
| | | @rm -f *.ko |
New file |
| | |
| | | #include <linux/init.h> |
| | | #include <linux/module.h> |
| | | #include <linux/kernel.h> |
| | | |
| | | static __init int hello_init(void) |
| | | { |
| | | printk(KERN_ALERT "hello module installed.\n"); |
| | | return 0; |
| | | } |
| | | |
| | | static __exit void hello_exit(void) |
| | | { |
| | | printk(KERN_ALERT "hello module removed.\n"); |
| | | } |
| | | |
| | | module_init(hello_init); |
| | | module_exit(hello_exit); |
| | | |
| | | MODULE_LICENSE("Dual BSD/GPL"); |
| | | MODULE_AUTHOR("GuoWenxue <guowenxue@gmail.com>"); |
New file |
| | |
| | | |
| | | #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/version.h> /* kernel version code */ |
| | | #include <linux/moduleparam.h> |
| | | |
| | | /* 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; |
| | | module_param(dev_major, int, S_IRUGO); |
| | | |
| | | 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 */ |
| | | } chrdev_t; |
| | | |
| | | static struct chrdev_s dev; |
| | | |
| | | static ssize_t chrdev_read (struct file *file, char __user *buf, size_t count, loff_t *f_pos) |
| | | { |
| | | struct chrdev_s *dev = file->private_data; |
| | | ssize_t nbytes; |
| | | ssize_t rv = 0; |
| | | |
| | | /* no data in buffer */ |
| | | if( !dev->bytes ) |
| | | return 0; |
| | | |
| | | /* copy data to user space */ |
| | | nbytes = count>dev->bytes ? dev->bytes : count; |
| | | if( copy_to_user(buf, dev->data, nbytes) ) |
| | | { |
| | | rv = -EFAULT; |
| | | goto out; |
| | | } |
| | | |
| | | /* update return value and data bytes in buffer */ |
| | | rv = nbytes; |
| | | dev->bytes -= nbytes; |
| | | |
| | | out: |
| | | return rv; |
| | | } |
| | | |
| | | static ssize_t chrdev_write (struct file *file, const char __user *buf, size_t count, loff_t *f_pos) |
| | | { |
| | | struct chrdev_s *dev = file->private_data; |
| | | ssize_t nbytes; |
| | | ssize_t rv = 0; |
| | | |
| | | /* no space left */ |
| | | if( dev->bytes >= dev->size ) |
| | | return -ENOSPC; |
| | | |
| | | /* check copy data bytes */ |
| | | if( dev->size - dev->bytes < count) |
| | | nbytes = dev->size - dev->bytes; |
| | | else |
| | | nbytes = count; |
| | | |
| | | /* copy data from user space */ |
| | | if( copy_from_user(&dev->data[dev->bytes], buf, nbytes) ) |
| | | { |
| | | rv = -EFAULT; |
| | | goto out; |
| | | } |
| | | |
| | | /* update return value and data bytes in buffer */ |
| | | rv = nbytes; |
| | | dev->bytes += nbytes; |
| | | |
| | | out: |
| | | return rv; |
| | | } |
| | | |
| | | static int chrdev_open (struct inode *inode, struct file *file) |
| | | { |
| | | struct chrdev_s *dev; /* device struct address */ |
| | | |
| | | /* get the device struct address by container_of() */ |
| | | dev = container_of(inode->i_cdev, struct chrdev_s, cdev); |
| | | |
| | | /* save the device struct address for other methods */ |
| | | file->private_data = dev; |
| | | |
| | | return 0; |
| | | } |
| | | |
| | | static int chrdev_close (struct inode *node, struct file *file) |
| | | { |
| | | return 0; |
| | | } |
| | | |
| | | static struct file_operations chrdev_fops = { |
| | | .owner = THIS_MODULE, |
| | | .open = chrdev_open, /* open() implementation */ |
| | | .read = chrdev_read, /* read() implementation */ |
| | | .write = chrdev_write, /* write() implementation */ |
| | | .release = chrdev_close, /* close() implementation */ |
| | | }; |
| | | |
| | | static int __init chrdev_init(void) |
| | | { |
| | | dev_t devno; |
| | | int rv; |
| | | |
| | | /* malloc and initial device read/write buffer */ |
| | | dev.data = kmalloc(DEV_SIZE, GFP_KERNEL); |
| | | if( !dev.data ) |
| | | { |
| | | printk(KERN_ERR " %s driver kmalloc() failed\n", DEV_NAME); |
| | | return -ENOMEM; |
| | | } |
| | | dev.size = DEV_SIZE; |
| | | dev.bytes = 0; |
| | | memset(dev.data, 0, dev.size); |
| | | |
| | | /* dynamic alloc device node major number if not set */ |
| | | if(0 != dev_major) |
| | | { |
| | | devno = MKDEV(dev_major, 0); |
| | | rv = register_chrdev_region(devno, 1, DEV_NAME); |
| | | } |
| | | else |
| | | { |
| | | rv = alloc_chrdev_region(&devno, 0, 1, DEV_NAME); |
| | | dev_major = MAJOR(devno); |
| | | } |
| | | |
| | | if(rv < 0) |
| | | { |
| | | printk(KERN_ERR "%s driver can't use major %d\n", DEV_NAME, dev_major); |
| | | return -ENODEV; |
| | | } |
| | | |
| | | /* setup and register cdev into kernel */ |
| | | cdev_init(&dev.cdev, &chrdev_fops); |
| | | dev.cdev.owner = THIS_MODULE; |
| | | rv = cdev_add(&dev.cdev, devno, 1); |
| | | if( rv ) |
| | | { |
| | | rv = -ENODEV; |
| | | printk(KERN_ERR "%s driver regist failed, rv=%d\n", DEV_NAME, rv); |
| | | 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); |
| | | #else |
| | | dev.class = class_create(THIS_MODULE, DEV_NAME); |
| | | #endif |
| | | if (IS_ERR(dev.class)) { |
| | | rv = PTR_ERR(dev.class); |
| | | goto failed2; |
| | | } |
| | | |
| | | dev.device = device_create(dev.class, NULL, MKDEV(dev_major, 0), NULL, DEV_NAME); |
| | | 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); |
| | | kfree(dev.data); |
| | | |
| | | printk(KERN_ERR "%s driver installed failed.\n", DEV_NAME); |
| | | return rv; |
| | | } |
| | | |
| | | 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); |
| | | |
| | | kfree(dev.data); |
| | | |
| | | printk(KERN_INFO "%s driver removed!\n", DEV_NAME); |
| | | return; |
| | | } |
| | | |
| | | module_init(chrdev_init); |
| | | module_exit(chrdev_exit); |
| | | |
| | | MODULE_LICENSE("Dual BSD/GPL"); |
| | | MODULE_AUTHOR("GuoWenxue <guowenxue@gmail.com>"); |
New file |
| | |
| | | |
| | | #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/version.h> /* kernel version code */ |
| | | #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; |
| | | module_param(dev_major, int, S_IRUGO); |
| | | |
| | | 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 */ |
| | | } chrdev_t; |
| | | |
| | | static struct chrdev_s dev; |
| | | |
| | | static ssize_t chrdev_read (struct file *file, char __user *buf, size_t count, loff_t *f_pos) |
| | | { |
| | | struct chrdev_s *dev = file->private_data; |
| | | ssize_t nbytes; |
| | | ssize_t rv = 0; |
| | | |
| | | /* no data in buffer */ |
| | | if( !dev->bytes ) |
| | | return 0; |
| | | |
| | | /* copy data to user space */ |
| | | nbytes = count>dev->bytes ? dev->bytes : count; |
| | | if( copy_to_user(buf, dev->data, nbytes) ) |
| | | { |
| | | rv = -EFAULT; |
| | | goto out; |
| | | } |
| | | |
| | | /* update return value and data bytes in buffer */ |
| | | rv = nbytes; |
| | | dev->bytes -= nbytes; |
| | | |
| | | out: |
| | | return rv; |
| | | } |
| | | |
| | | static ssize_t chrdev_write (struct file *file, const char __user *buf, size_t count, loff_t *f_pos) |
| | | { |
| | | struct chrdev_s *dev = file->private_data; |
| | | ssize_t nbytes; |
| | | ssize_t rv = 0; |
| | | |
| | | /* no space left */ |
| | | if( dev->bytes >= dev->size ) |
| | | return -ENOSPC; |
| | | |
| | | /* check copy data bytes */ |
| | | if( dev->size - dev->bytes < count) |
| | | nbytes = dev->size - dev->bytes; |
| | | else |
| | | nbytes = count; |
| | | |
| | | /* copy data from user space */ |
| | | if( copy_from_user(&dev->data[dev->bytes], buf, nbytes) ) |
| | | { |
| | | rv = -EFAULT; |
| | | goto out; |
| | | } |
| | | |
| | | /* update return value and data bytes in buffer */ |
| | | rv = nbytes; |
| | | dev->bytes += nbytes; |
| | | |
| | | out: |
| | | return rv; |
| | | } |
| | | |
| | | /* The ioctl() implementation */ |
| | | 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); |
| | | |
| | | /* |
| | | * 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; |
| | | |
| | | /* |
| | | * the direction is a bitmask, and VERIFY_WRITE catches R/W transfers. |
| | | * `Type' is user-oriented, while access_ok is kernel-oriented, |
| | | * so the concept of "read" and "write" is reversed |
| | | */ |
| | | if (_IOC_DIR(cmd) & _IOC_READ) |
| | | 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; |
| | | |
| | | switch(cmd) { |
| | | case CHRDEV_IOCRESET: |
| | | dev->bytes = 0; |
| | | memset(dev->data, 0, dev->size); |
| | | rv = 0; |
| | | 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); |
| | | break; |
| | | |
| | | default: |
| | | return -ENOTTY; |
| | | } |
| | | |
| | | return rv; |
| | | } |
| | | |
| | | static int chrdev_open (struct inode *inode, struct file *file) |
| | | { |
| | | struct chrdev_s *dev; /* device struct address */ |
| | | |
| | | /* get the device struct address by container_of() */ |
| | | dev = container_of(inode->i_cdev, struct chrdev_s, cdev); |
| | | |
| | | /* save the device struct address for other methods */ |
| | | file->private_data = dev; |
| | | |
| | | return 0; |
| | | } |
| | | |
| | | static int chrdev_close (struct inode *node, struct file *file) |
| | | { |
| | | return 0; |
| | | } |
| | | |
| | | static struct file_operations chrdev_fops = { |
| | | .owner = THIS_MODULE, |
| | | .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 */ |
| | | }; |
| | | |
| | | static int __init chrdev_init(void) |
| | | { |
| | | dev_t devno; |
| | | int rv; |
| | | |
| | | /* malloc and initial device read/write buffer */ |
| | | dev.data = kmalloc(DEV_SIZE, GFP_KERNEL); |
| | | if( !dev.data ) |
| | | { |
| | | printk(KERN_ERR " %s driver kmalloc() failed\n", DEV_NAME); |
| | | return -ENOMEM; |
| | | } |
| | | dev.size = DEV_SIZE; |
| | | dev.bytes = 0; |
| | | memset(dev.data, 0, dev.size); |
| | | |
| | | /* dynamic alloc device node major number if not set */ |
| | | if(0 != dev_major) |
| | | { |
| | | devno = MKDEV(dev_major, 0); |
| | | rv = register_chrdev_region(devno, 1, DEV_NAME); |
| | | } |
| | | else |
| | | { |
| | | rv = alloc_chrdev_region(&devno, 0, 1, DEV_NAME); |
| | | dev_major = MAJOR(devno); |
| | | } |
| | | |
| | | if(rv < 0) |
| | | { |
| | | printk(KERN_ERR "%s driver can't use major %d\n", DEV_NAME, dev_major); |
| | | return -ENODEV; |
| | | } |
| | | |
| | | /* setup and register cdev into kernel */ |
| | | cdev_init(&dev.cdev, &chrdev_fops); |
| | | dev.cdev.owner = THIS_MODULE; |
| | | rv = cdev_add(&dev.cdev, devno, 1); |
| | | if( rv ) |
| | | { |
| | | rv = -ENODEV; |
| | | printk(KERN_ERR "%s driver regist failed, rv=%d\n", DEV_NAME, rv); |
| | | 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); |
| | | #else |
| | | dev.class = class_create(THIS_MODULE, DEV_NAME); |
| | | #endif |
| | | if (IS_ERR(dev.class)) { |
| | | rv = PTR_ERR(dev.class); |
| | | goto failed2; |
| | | } |
| | | |
| | | dev.device = device_create(dev.class, NULL, MKDEV(dev_major, 0), NULL, DEV_NAME); |
| | | 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); |
| | | kfree(dev.data); |
| | | |
| | | printk(KERN_ERR "%s driver installed failed.\n", DEV_NAME); |
| | | return rv; |
| | | } |
| | | |
| | | 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); |
| | | |
| | | kfree(dev.data); |
| | | |
| | | printk(KERN_INFO "%s driver removed!\n", DEV_NAME); |
| | | return; |
| | | } |
| | | |
| | | module_init(chrdev_init); |
| | | module_exit(chrdev_exit); |
| | | |
| | | MODULE_LICENSE("Dual BSD/GPL"); |
| | | MODULE_AUTHOR("GuoWenxue <guowenxue@gmail.com>"); |
New file |
| | |
| | | /********************************************************************************* |
| | | * Copyright: (C) 2023 Avnet |
| | | * All rights reserved. |
| | | * |
| | | * Filename: file.c |
| | | * Description: This file |
| | | * |
| | | * Version: 1.0.0(2023年11月02日) |
| | | * Author: Guo Wenxue <guowenxue@avnet.com> |
| | | * ChangeLog: 1, Release initial version on "2023年11月02日 14时47分52秒" |
| | | * |
| | | ********************************************************************************/ |
| | | |
| | | #include <stdio.h> |
| | | #include <unistd.h> |
| | | #include <string.h> |
| | | #include <errno.h> |
| | | #include <fcntl.h> |
| | | #include <sys/types.h> |
| | | #include <sys/stat.h> |
| | | #include <sys/ioctl.h> |
| | | |
| | | /* 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) |
| | | |
| | | int main (int argc, char **argv) |
| | | { |
| | | char *devname = "/dev/chrdev"; |
| | | char buf[1024]; |
| | | int rv, fd; |
| | | int value = 0x12345678; |
| | | |
| | | fd = open(devname, O_RDWR|O_TRUNC); |
| | | if( fd < 0 ) |
| | | { |
| | | printf("Open device %s failed: %s\n", devname, strerror(errno)); |
| | | return 1; |
| | | } |
| | | |
| | | rv = write(fd, "Hello", 5); |
| | | if( rv< 0) |
| | | { |
| | | printf("Write data into device failed, rv=%d: %s\n", rv, strerror(errno)); |
| | | return 2; |
| | | } |
| | | printf("Write %d bytes data okay\n", rv); |
| | | |
| | | #if 0 |
| | | lseek(fd, 3, SEEK_SET); |
| | | #endif |
| | | |
| | | memset(buf, 0, sizeof(buf)); |
| | | rv = read(fd, buf, sizeof(buf)); |
| | | if( rv< 0) |
| | | { |
| | | printf("Read data from device failed, rv=%d: %s\n", rv, strerror(errno)); |
| | | return 3; |
| | | } |
| | | printf("Read %d bytes data: %s\n", rv, buf); |
| | | |
| | | #if 0 |
| | | ioctl(fd, CHRDEV_IOCSET, &value); |
| | | value = 0; |
| | | ioctl(fd, CHRDEV_IOCGET, &value); |
| | | printf("ioctl() read value=0x%0x\n", value); |
| | | #endif |
| | | |
| | | close(fd); |
| | | return 0; |
| | | } |
| | | |
New file |
| | |
| | | /********************************************************************************* |
| | | * Copyright: (C) 2023 Avnet |
| | | * All rights reserved. |
| | | * |
| | | * Filename: file.c |
| | | * Description: This file |
| | | * |
| | | * Version: 1.0.0(2023年11月02日) |
| | | * Author: Guo Wenxue <guowenxue@avnet.com> |
| | | * ChangeLog: 1, Release initial version on "2023年11月02日 14时47分52秒" |
| | | * |
| | | ********************************************************************************/ |
| | | |
| | | #include <stdio.h> |
| | | #include <unistd.h> |
| | | #include <string.h> |
| | | #include <errno.h> |
| | | #include <fcntl.h> |
| | | #include <sys/types.h> |
| | | #include <sys/stat.h> |
| | | #include <sys/ioctl.h> |
| | | |
| | | /* 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) |
| | | |
| | | int main (int argc, char **argv) |
| | | { |
| | | char *devname = "/dev/chrdev"; |
| | | char buf[1024]; |
| | | int rv, fd; |
| | | int value = 0x12345678; |
| | | |
| | | fd = open(devname, O_RDWR|O_TRUNC); |
| | | if( fd < 0 ) |
| | | { |
| | | printf("Open device %s failed: %s\n", devname, strerror(errno)); |
| | | return 1; |
| | | } |
| | | |
| | | rv = write(fd, "Hello", 5); |
| | | if( rv< 0) |
| | | { |
| | | printf("Write data into device failed, rv=%d: %s\n", rv, strerror(errno)); |
| | | return 2; |
| | | } |
| | | printf("Write %d bytes data okay\n", rv); |
| | | |
| | | memset(buf, 0, sizeof(buf)); |
| | | rv = read(fd, buf, sizeof(buf)); |
| | | if( rv< 0) |
| | | { |
| | | printf("Read data from device failed, rv=%d: %s\n", rv, strerror(errno)); |
| | | return 3; |
| | | } |
| | | printf("Read %d bytes data: %s\n", rv, buf); |
| | | |
| | | ioctl(fd, CHRDEV_IOCSET, &value); |
| | | value = 0; |
| | | ioctl(fd, CHRDEV_IOCGET, &value); |
| | | printf("ioctl() read value=0x%0x\n", value); |
| | | |
| | | close(fd); |
| | | return 0; |
| | | } |
| | | |
New file |
| | |
| | | #******************************************************************************** |
| | | # Copyright: (C) 2023 LingYun IoT System Studio |
| | | # All rights reserved. |
| | | # |
| | | # Filename: Makefile |
| | | # Description: This file used to compile all the C file to respective binary, |
| | | # and it will auto detect cross compile or local compile. |
| | | # |
| | | # Version: 1.0.0(11/08/23) |
| | | # Author: Guo Wenxue <guowenxue@gmail.com> |
| | | # ChangeLog: 1, Release initial version on "11/08/23 16:18:43" |
| | | # |
| | | #******************************************************************************* |
| | | |
| | | |
| | | BUILD_ARCH=$(shell uname -m) |
| | | ifneq ($(findstring "x86_64" "i386", $(BUILD_ARCH)),) |
| | | CROSS_COMPILE?=arm-linux-gnueabihf- |
| | | endif |
| | | |
| | | CC=${CROSS_COMPILE}gcc |
| | | |
| | | SRCFILES = $(wildcard *.c) |
| | | BINARIES=$(SRCFILES:%.c=%) |
| | | |
| | | all: ${BINARIES} |
| | | |
| | | %: %.c |
| | | $(CC) $(CFLAGS) -o $@ $< $(LDFLAGS) |
| | | |
| | | clean: |
| | | rm -f ${BINARIES} |