102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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 <linux/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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return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
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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 < 0 || *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_open(struct inode *inode, struct file *file)
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{
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if (file->f_mode & FMODE_WRITE)
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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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.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%px\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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