driver-devlop-entrance-v1.0.rar_华恒

/* driver/char/gpio_drv.c * * This file provide IO reading and writing from user space. * Pls create some device file in diretory /dev/ppcflash whose major is 218. * This driver support 0-255 devices. In user space user can read and write * IO through open and ioctl function provided by glibc. * * Any problem pls contact support@hhcn.com */ #include <linux/fs.h> #include <linux/iobuf.h> #include <linux/major.h> #include <linux/blkdev.h> #include <linux/capability.h> #include <linux/smp_lock.h> #include <asm/uaccess.h> #include <asm/hardware.h> #include <asm/arch/cpu_s3c2410.h> #include <asm/io.h> #include "gpio_drv.h" #include <linux/vmalloc.h> #include <linux/module.h> //wpq insmod gpio #define dprintk(x...) #define IOPORT_MAJOR 220 //#define gpio_devfs_dir /*define the ppcflash major node is 220*/ typedef char ioport_device_t; devfs_handle_t gpio_devfs_dir; static ioport_device_t gpio_devices[256]; long port_addr; int gpio_open(struct inode *, struct file *); int gpio_release(struct inode *, struct file *); int gpio_ctl_ioctl(struct inode *, struct file *, unsigned int, unsigned long); //################################################################# //wpq mod /* static struct file_operations gpio_fops = { open: gpio_open, release: gpio_release, }; */ static struct file_operations gpio_ctl_fops = { ioctl: gpio_ctl_ioctl, open: gpio_open, release: gpio_release, }; /*int __init gpio_init(void) { register_chrdev(IOPORT_MAJOR, "gpiotest", &gpio_ctl_fops); return 0; */ /* * Open/close code for raw IO. */ gpio_open(struct inode *inode, struct file *filp) { int minor; minor = MINOR(inode->i_rdev); /* if (ioport_devices[minor].io_lock) { printk("Device is busy\n"); return -1; }*/ set_gpio_ctrl(GPIO_MODE_OUT | GPIO_C6); #if 0 (void *)(port_addr) = ioremap(0x56000020,0x8); printk("port addr is %x\n",port_addr); printk("port addr is %x\n", GPCON(GPIO_MODE_OUT | GPIO_C6)); // *(volatile unsigned int *)(port_addr)|=0x00008000; // set_gpio_ctrl(GPIO_MODE_VD); // *(volatile unsigned int *)(0x56000020)|=0x00008000; #endif printk("open ok\n"); gpio_devices[minor]++; return 0; } //__ioremap int gpio_release(struct inode *inode, struct file *filp) { int minor; minor = MINOR(inode->i_rdev); if (gpio_devices[minor]) gpio_devices[minor]--; // *(volatile unsigned int *)(0x56000020)&=~0x00008000; printk("release ok\n"); return 0; } /* * Deal with ioctls against the raw-device control interface, to bind * and unbind other raw devices. */ int gpio_ctl_ioctl(struct inode *inode, struct file *flip, unsigned int command, unsigned long arg) { int err = 0; int minor = MINOR(inode->i_rdev); switch (command) { case IOWRITE: // *(volatile unsigned int *)(port_addr+1)|=0x00000080; write_gpio_bit(GPIO_MODE_OUT | GPIO_C6,1); printk("HHTECH: here write ok1111\n"); return 0; case IOCLEAR: write_gpio_bit(GPIO_MODE_OUT | GPIO_C6,0); // *(volatile unsigned int *)(port_addr+1)&=~0x00000080; printk("clear ok\n"); return 0; default: err = -EINVAL; } return err; } //########################################################## //hhtech add it by wpq ,2005 01 28 // static int __init gpio_init (void) { // gpio_devfs_dir = devfs_mk_dir(NULL, "gpiotest", NULL); // if(!gpio_devfs_dir) // return -EBUSY; // register_chrdev(IOPORT_MAJOR, "gpiotest", &gpio_ctl_fops); //devfs_register(IOPORT_MAJOR, "gpiotest", &gpio_ctl_fops); //############################################################################ // //hhtech add it by wpq //date:20050128 //The" devfs"is very important!!!register file command //note:devfs and register ;but ,devfs= register+mknod //Here isn't use :mknod /dev/gpiotest c 220 0 gpio_devfs_dir= devfs_register(NULL,"gpiotest",DEVFS_FL_DEFAULT,IOPORT_MAJOR, 0, S_IFCHR |S_IRUSR |S_IWUSR |S_IRGRP |S_IWGRP, &gpio_ctl_fops, NULL); printk ("gpio driver installed OK\n"); printk ("Test is starting!\n"); return 0; } static void __exit gpio_exit(void) { devfs_unregister(gpio_devfs_dir); printk("gpio driver uninstalled OK\n"); } module_init(gpio_init); module_exit(gpio_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("wpq"); MODULE_DESCRIPTION("gpio Driver for arm9_edu");