279 lines
6.8 KiB
C
279 lines
6.8 KiB
C
/* -------------------------------------------------------------------------
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* Copyright (C) 2013-2014 Inside Secure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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* ------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------
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* Copyright (C) 2014-2016, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* ------------------------------------------------------------------------- */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <asm/uaccess.h>
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#include "fdp_main.h"
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#include "porting_types.h"
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MODULE_ALIAS("i2c:fdp");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL");
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int fdp_major = FIELDSPEAK_MAJOR;
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int fdp_minor = 0;
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void fdp_cleanup_module(void);
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static struct fdp_dev {
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/* common stuff, should be kept unchanged */
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struct cdev cdev; /* char device structure */
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bool_t cdev_registered;
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struct class * class; /* sysfs class */
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bool_t class_registered;
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struct device device; /* sysfs device */
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bool_t device_registered;
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} instance;
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/*
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* Function called when user opens the device
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*/
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int fdp_open(struct inode *inode, struct file *filp)
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{
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return fdp_custom_open(inode, filp);
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}
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/*
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* Function called when user closes the device
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*/
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int fdp_release(struct inode *inode, struct file *filp)
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{
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return fdp_custom_release(inode, filp);
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}
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/*
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* function called when user performs a read operation
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*/
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ssize_t fdp_read(struct file *filp, char __user *buf, size_t count, loff_t *f_pos)
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{
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return fdp_custom_read(filp, buf, count, f_pos);
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}
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/*
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* function called when user performs a write operation
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*/
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ssize_t fdp_write(struct file *filp, const char __user *buf, size_t count,
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loff_t *f_pos)
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{
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return fdp_custom_write(filp, buf, count, f_pos);
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}
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/*
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* function called when user performs a ioctl operation
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*/
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long fdp_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int retval = 0;
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int err = 0;
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/*
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* extract the type and number bitfields, and don't decode
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* wrong cmds: return ENOTTY (inappropriate ioctl) before access_ok()
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*/
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if (_IOC_TYPE(cmd) != FIELDSPEAK_IOC_MAGIC) return -ENOTTY;
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if (_IOC_NR(cmd) > FIELDSPEAK_MAX_IOCTL_VALUE) return -ENOTTY;
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/*
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* the direction is a bitmask, and VERIFY_WRITE catches R/W
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* transfers. `Type' is user-oriented, while
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* access_ok is kernel-oriented, so the concept of "read" and
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* "write" is reversed
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*/
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if (_IOC_DIR(cmd) & _IOC_READ)
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err = !access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd));
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else if (_IOC_DIR(cmd) & _IOC_WRITE)
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err = !access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
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if (err) return -EFAULT;
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switch(cmd) {
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case FIELDSPEAK_IOC_RESET:
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retval = fdp_custom_ioctl_reset(filp, cmd, arg);
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break;
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}
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return retval;
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}
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unsigned int fdp_poll(struct file *filp, poll_table *wait)
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{
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return fdp_custom_poll(filp, wait);
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}
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struct file_operations fdp_fops = {
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.owner = THIS_MODULE,
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.read = fdp_read,
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.write = fdp_write,
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.unlocked_ioctl = fdp_ioctl,
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.open = fdp_open,
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.release = fdp_release,
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.poll = fdp_poll,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = fdp_ioctl
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#endif
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};
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/*
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* function called when user loads the driver
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*/
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int fdp_init_module(void)
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{
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int result;
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int devno;
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printk(KERN_DEBUG "fdp_init_module\n");
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if (fdp_major) {
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/* user supplied major number, register the region */
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devno = MKDEV(fdp_major, fdp_minor);
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result = register_chrdev_region(devno, 1, "fieldspeak");
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}
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else {
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/* automatic major number, allocate a region */
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result = alloc_chrdev_region(&devno, fdp_minor, 1, "fieldspeak");
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fdp_major = MAJOR(devno);
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}
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if (result < 0) {
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printk(KERN_ERR "fdp : can't get major %d\n", fdp_major);
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return result;
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}
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/* reset the instance */
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memset(& instance, 0, sizeof(instance));
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/* register the char device */
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cdev_init( & instance.cdev, &fdp_fops);
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instance.cdev.owner = THIS_MODULE;
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result = cdev_add( & instance.cdev, devno, 1);
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if (result)
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{
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printk(KERN_ERR "fdp : can't register device");
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fdp_cleanup_module();
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return result;
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}
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instance.cdev_registered = 1;
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/* register the nfc class */
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instance.class = class_create(THIS_MODULE, "nfc");
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if (IS_ERR(instance.class)) {
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printk(KERN_ERR "fdp : can't create class");
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result = PTR_ERR(instance.class);
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fdp_cleanup_module();
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return result;
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}
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fdp_custom_init();
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instance.class_registered = 1;
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/* add a device into the class */
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device_create(instance.class, NULL, devno, NULL, "nfcc");
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instance.device_registered = 1;
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/* succeeded */
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return 0;
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}
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/*
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* function called when user unloads the driver
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*/
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void fdp_cleanup_module(void)
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{
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int devno = MKDEV(fdp_major, fdp_minor);
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printk(KERN_DEBUG "fdp_cleanup_module\n");
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fdp_custom_exit();
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/* remove the device from the class if successfully added */
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if (instance.device_registered)
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{
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device_destroy(instance.class, devno);
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}
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/* unregister the device only if the registration succeeded */
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if (instance.class_registered)
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{
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class_destroy(instance.class);
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}
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/* unregister the character device */
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if (instance.cdev_registered)
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{
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cdev_del(&instance.cdev);
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}
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/* always unregister the region, since fdp_cleanup_module is not called if the registration failed */
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unregister_chrdev_region(devno, 1);
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}
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module_init(fdp_init_module);
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module_exit(fdp_cleanup_module);
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/* EOF */
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