Olá. Preciso de ajuda com esse tutorial. O título é:
Writing device drivers in Linux: A brief tutorial O link é: http://www.freesoftwaremagazine.com/node/1238/pdf Não consegui fazer a compilação do memory.c e nem do paralelport.c nem com gcc nem com makefile. memory.c ################### /* Necessary includes for device drivers */ #include <linux/init.h> #include <linux/config.h> #include <linux/module.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/proc_fs.h> #include <linux/fcntl.h> /* O_ACCMODE */ #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_from/to_user */ MODULE_LICENSE("Dual BSD/GPL"); /* Declaration of memory.c functions */ int memory_open(struct inode *inode, struct file *filp); int memory_release(struct inode *inode, struct file *filp); ssize_t memory_read(struct file *filp, char *buf, size_t count, loff_t *f_pos); ssize_t memory_write(struct file *filp, char *buf, size_t count, loff_t *f_pos); void memory_exit(void); int memory_init(void); /* Structure that declares the usual file */ /* access functions */ struct file_operations memory_fops = { read: memory_read, write: memory_write, open: memory_open, release: memory_release }; /* Declaration of the init and exit functions */ module_init(memory_init); module_exit(memory_exit); /* Global variables of the driver */ /* Major number */ int memory_major = 60; /* Buffer to store data */ char *memory_buffer; int memory_init(void) { int result; /* Registering device */ result = register_chrdev(memory_major, "memory", &memory_fops); if (result < 0) { printk( "<1>memory: cannot obtain major number %d\n", memory_major); return result; } /* Allocating memory for the buffer */ memory_buffer = kmalloc(1, GFP_KERNEL); if (!memory_buffer) { result = -ENOMEM; goto fail; } memset(memory_buffer, 0, 1); printk("<1>Inserting memory module\n"); return 0; fail: memory_exit(); return result; } void memory_exit(void) { /* Freeing the major number */ unregister_chrdev(memory_major, "memory"); /* Freeing buffer memory */ if (memory_buffer) { kfree(memory_buffer); } printk("<1>Removing memory module\n"); } int memory_open(struct inode *inode, struct file *filp) { /* Success */ return 0; } ssize_t memory_read(struct file *filp, char *buf, size_t count, loff_t *f_pos) { /* Transfering data to user space */ copy_to_user(buf,memory_buffer,1); /* Changing reading position as best suits */ if (*f_pos == 0) { *f_pos+=1; return 1; } else { return 0; } } ssize_t memory_write( struct file *filp, char *buf, size_t count, loff_t *f_pos) { char *tmp; tmp=buf+count-1; copy_from_user(memory_buffer,tmp,1); return 1; } Paralelport.c ################# /* Necessary includes for drivers */ #include <linux/init.h> #include <linux/config.h> #include <linux/module.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/proc_fs.h> #include <linux/fcntl.h> /* O_ACCMODE */ #include <linux/ioport.h> #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_from/to_user */ #include <asm/io.h> /* inb, outb */ MODULE_LICENSE("Dual BSD/GPL"); /* Function declaration of parlelport.c */ int parlelport_open(struct inode *inode, struct file *filp); int parlelport_release(struct inode *inode, struct file *filp); ssize_t parlelport_read(struct file *filp, char *buf, size_t count, loff_t *f_pos); ssize_t parlelport_write(struct file *filp, char *buf, size_t count, loff_t *f_pos); void parlelport_exit(void); int parlelport_init(void); /* Structure that declares the common */ /* file access fcuntions */ struct file_operations parlelport_fops = { read: parlelport_read, write: parlelport_write, open: parlelport_open, release: parlelport_release }; /* Driver global variables */ /* Major number */ int parlelport_major = 61; /* Control variable for memory */ /* reservation of the parallel port*/ int port; module_init(parlelport_init); module_exit(parlelport_exit); int parlelport_init(void) { int result; /* Registering device */ result = register_chrdev(parlelport_major, "parlelport", &parlelport_fops); if (result < 0) { printk( "<1>parlelport: cannot obtain major number %d\n", parlelport_major); return result; } <parlelport modified init module> printk("<1>Inserting parlelport module\n"); return 0; fail: parlelport_exit(); return result; } void parlelport_exit(void) { /* Make major number free! */ unregister_chrdev(parlelport_major, "parlelport"); <parlelport modified exit module> printk("<1>Removing parlelport module\n"); } int parlelport_open(struct inode *inode, struct file *filp) { /* Success */ return 0; } int parlelport_release(struct inode *inode, struct file *filp) { /* Success */ return 0; } ssize_t parlelport_read(struct file *filp, char *buf, size_t count, loff_t *f_pos) { /* Buffer to read the device */ char parlelport_buffer; <parlelport inport> /* We transfer data to user space */ copy_to_user(buf,&parlelport_buffer,1); /* We change the reading position as best suits */ if (*f_pos == 0) { *f_pos+=1; return 1; } else { return 0; } } ssize_t parlelport_write( struct file *filp, char *buf, size_t count, loff_t *f_pos) { char *tmp; /* Buffer writing to the device */ char parlelport_buffer; } tmp=buf+count-1; copy_from_user(&parlelport_buffer,tmp,1); <parlelport outport> return 1; } -- Data Estelar 2455801,305336 http://sites.google.com/site/ficmatinf Desejo-lhe Paz, Vida Longa e Prosperidade. 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