320 lines
6.4 KiB
C
320 lines
6.4 KiB
C
/*
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* Intel NPK utility driver provides ioctl to access NPK driver registers
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*
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* Copyright (c) 2013 Intel Corporation, Kai Li <kai.li@intel.com>
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/compat.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/npk.h>
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#include "npk_pci.h"
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/**
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* npk_util_reg_read
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*
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* This function allows to read memory mapped NPK CSR registers
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*/
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static int npk_util_reg_read(unsigned long arg)
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{
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struct npk_reg_cmd ncmd;
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int ret;
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if (copy_from_user(&ncmd, (void __user *)arg, sizeof(struct npk_reg_cmd)))
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return -EFAULT;
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ret = npk_reg_read(ncmd.offset, &ncmd.data);
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if (ret) {
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pr_err("register read failed\n");
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return -EFAULT;
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}
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if (copy_to_user((void __user *)arg, &ncmd, sizeof(struct npk_reg_cmd)))
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return -EFAULT;
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return ret;
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}
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/**
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* npk_util_reg_write
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*
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* This function allows to write memory mapped NPK CSR registers
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*/
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static int npk_util_reg_write(unsigned long arg)
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{
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struct npk_reg_cmd ncmd;
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int ret;
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if (copy_from_user(&ncmd, (void __user *)arg, sizeof(struct npk_reg_cmd)))
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return -EFAULT;
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ret = npk_reg_write(ncmd.offset, ncmd.data);
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return ret;
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}
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/**
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* npk_util_pci_read
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*
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* This function allows to read NPK PCI configuration space
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*/
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static int npk_util_pci_read(unsigned long arg)
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{
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struct pci_cfg_cmd pcmd;
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int ret;
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if (copy_from_user(&pcmd, (void __user *)arg, sizeof(struct pci_cfg_cmd)))
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return -EFAULT;
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ret = npk_pci_read(pcmd.offset, &pcmd.data, pcmd.size);
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if (ret) {
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pr_err("pci read failed\n");
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return -EFAULT;
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}
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if (copy_to_user((void __user *)arg, &pcmd, sizeof(struct pci_cfg_cmd)))
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return -EFAULT;
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return 0;
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}
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/**
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* npk_util_pci_write
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*
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* This function allows to write NPK PCI configuration space
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*/
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static int npk_util_pci_write(unsigned long arg)
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{
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struct pci_cfg_cmd pcmd;
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int ret;
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if (copy_from_user(&pcmd, (void __user *)arg, sizeof(struct pci_cfg_cmd)))
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return -EFAULT;
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ret = npk_pci_write(pcmd.offset, pcmd.data, pcmd.size);
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if (ret) {
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pr_err("pci write failed\n");
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return -EFAULT;
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}
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return 0;
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}
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#define MEM_READ_WRITE_MAX_SIZE 0x20000
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/**
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* npk_util_mem_read
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*
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* This function allows to read several NPK PCI registers at once.
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* The npk_mem_cmd structure holds an array of offsets, and an array
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* of data (value that is read for each offset).
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*/
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static int npk_util_mem_read(unsigned long arg)
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{
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struct npk_mem_cmd kcmd;
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int ret = 0;
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int i;
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int length;
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u32 *offset;
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u32 *data;
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if (copy_from_user(&kcmd, (void __user *)arg, sizeof(struct npk_mem_cmd)))
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return -EFAULT;
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/* sanity check */
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if (kcmd.size > MEM_READ_WRITE_MAX_SIZE)
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return -EINVAL;
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length = sizeof(u32) * kcmd.size;
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offset = kmalloc(length, GFP_KERNEL);
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if (!offset)
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return -ENOMEM;
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if (copy_from_user(offset, (void __user *)kcmd.addr, length)) {
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ret = -EFAULT;
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goto err_offset;
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}
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data = kmalloc(length, GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto err_offset;
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}
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for (i = 0; i < kcmd.size; i++) {
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ret = npk_reg_read(offset[i], &data[i]);
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if (ret) {
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ret = -EFAULT;
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goto err_data;
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}
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}
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if (copy_to_user((void __user *)kcmd.data, data, length))
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ret = -EFAULT;
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err_data:
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kfree(data);
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err_offset:
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kfree(offset);
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return ret;
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}
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/**
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* npk_util_mem_write
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*
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* This function allows to write several NPK PCI registers at once.
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* The npk_mem_cmd structure holds an array of offsets and an array of
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* data to apply for each offset.
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*/
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static int npk_util_mem_write(unsigned long arg)
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{
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struct npk_mem_cmd kcmd;
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int ret = 0;
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int i;
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int length;
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u32 *offset;
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u32 *data;
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if (copy_from_user(&kcmd, (void __user *)arg, sizeof(struct npk_mem_cmd)))
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return -EFAULT;
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/* sanity check */
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if (kcmd.size > MEM_READ_WRITE_MAX_SIZE)
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return -EINVAL;
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length = sizeof(u32) * kcmd.size;
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offset = kmalloc(length, GFP_KERNEL);
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if (!offset)
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return -ENOMEM;
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if (copy_from_user(offset, (void __user *)kcmd.addr, length)) {
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ret = -EFAULT;
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goto err_offset;
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}
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data = kmalloc(length, GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto err_offset;
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}
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if (copy_from_user(data, (void __user *)kcmd.data, length)) {
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ret = -EFAULT;
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goto err_data;
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}
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for (i = 0; i < kcmd.size; i++) {
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ret = npk_reg_write(offset[i], data[i]);
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if (ret) {
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ret = -EFAULT;
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goto err_data;
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}
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}
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err_data:
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kfree(data);
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err_offset:
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kfree(offset);
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return ret;
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}
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static long npk_util_ioctl(struct file *fp,
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unsigned int cmd, unsigned long arg)
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{
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int ret;
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switch (cmd) {
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case NPKIOC_REG_READ:
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ret = npk_util_reg_read(arg);
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break;
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case NPKIOC_REG_WRITE:
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ret = npk_util_reg_write(arg);
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break;
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case NPKIOC_PCI_REG_READ:
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ret = npk_util_pci_read(arg);
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break;
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case NPKIOC_PCI_REG_WRITE:
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ret = npk_util_pci_write(arg);
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break;
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case NPKIOC_MEM_READ:
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ret = npk_util_mem_read(arg);
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break;
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case NPKIOC_MEM_WRITE:
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ret = npk_util_mem_write(arg);
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break;
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default:
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pr_err("unknown ioctl called!\n");
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ret = -EINVAL;
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}
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return ret;
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}
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#ifdef CONFIG_COMPAT
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static long npk_util_compat_ioctl(struct file *file, uint command, ulong u)
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{
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return npk_util_ioctl(file, command, (ulong)compat_ptr(u));
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}
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#else
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#define npk_util_compat_ioctl NULL
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#endif
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static const struct file_operations npk_util_fops = {
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.unlocked_ioctl = npk_util_ioctl,
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.compat_ioctl = npk_util_compat_ioctl,
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};
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static struct miscdevice npk_util = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "npk_util",
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.fops = &npk_util_fops,
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};
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static int __init npk_util_init(void)
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{
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return misc_register(&npk_util);
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}
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static void __exit npk_util_exit(void)
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{
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misc_deregister(&npk_util);
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}
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module_init(npk_util_init);
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module_exit(npk_util_exit);
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MODULE_AUTHOR("Kai Li <kai.li@intel.com>");
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MODULE_DESCRIPTION("Intel NPK Utility driver");
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MODULE_LICENSE("GPL v2");
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