d54b1fdb1d
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
135 lines
3.1 KiB
C
135 lines
3.1 KiB
C
/*
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* EISA "eeprom" support routines
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*
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* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
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*
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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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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/eisa_eeprom.h>
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#define EISA_EEPROM_MINOR 241
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static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
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{
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switch (origin) {
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case 0:
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/* nothing to do */
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break;
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case 1:
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offset += file->f_pos;
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break;
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case 2:
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offset += HPEE_MAX_LENGTH;
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break;
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}
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return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
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}
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static ssize_t eisa_eeprom_read(struct file * file,
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char __user *buf, size_t count, loff_t *ppos )
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{
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unsigned char *tmp;
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ssize_t ret;
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int i;
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if (*ppos >= HPEE_MAX_LENGTH)
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return 0;
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count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
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tmp = kmalloc(count, GFP_KERNEL);
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if (tmp) {
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for (i = 0; i < count; i++)
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tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
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if (copy_to_user (buf, tmp, count))
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ret = -EFAULT;
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else
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ret = count;
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kfree (tmp);
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} else
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ret = -ENOMEM;
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return ret;
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}
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static int eisa_eeprom_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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static int eisa_eeprom_open(struct inode *inode, struct file *file)
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{
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if (file->f_mode & 2)
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return -EINVAL;
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return 0;
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}
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static int eisa_eeprom_release(struct inode *inode, struct file *file)
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{
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return 0;
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}
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/*
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* The various file operations we support.
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*/
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static const struct file_operations eisa_eeprom_fops = {
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.owner = THIS_MODULE,
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.llseek = eisa_eeprom_llseek,
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.read = eisa_eeprom_read,
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.ioctl = eisa_eeprom_ioctl,
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.open = eisa_eeprom_open,
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.release = eisa_eeprom_release,
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};
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static struct miscdevice eisa_eeprom_dev = {
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EISA_EEPROM_MINOR,
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"eisa_eeprom",
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&eisa_eeprom_fops
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};
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static int __init eisa_eeprom_init(void)
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{
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int retval;
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if (!eisa_eeprom_addr)
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return -ENODEV;
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retval = misc_register(&eisa_eeprom_dev);
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if (retval < 0) {
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printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
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return retval;
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}
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printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
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return 0;
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}
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MODULE_LICENSE("GPL");
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module_init(eisa_eeprom_init);
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