1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* 
  3 *    EISA "eeprom" support routines
  4 *
  5 *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/init.h>
 10#include <linux/kernel.h>
 11#include <linux/miscdevice.h>
 12#include <linux/slab.h>
 13#include <linux/fs.h>
 14#include <asm/io.h>
 15#include <linux/uaccess.h>
 16#include <asm/eisa_eeprom.h>
 17
 18#define 	EISA_EEPROM_MINOR 241
 19
 20static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
 21{
 22	return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
 23}
 24
 25static ssize_t eisa_eeprom_read(struct file * file,
 26			      char __user *buf, size_t count, loff_t *ppos )
 27{
 28	unsigned char *tmp;
 29	ssize_t ret;
 30	int i;
 31	
 32	if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
 33		return 0;
 34	
 35	count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
 36	tmp = kmalloc(count, GFP_KERNEL);
 37	if (tmp) {
 38		for (i = 0; i < count; i++)
 39			tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
 40
 41		if (copy_to_user (buf, tmp, count))
 42			ret = -EFAULT;
 43		else
 44			ret = count;
 45		kfree (tmp);
 46	} else
 47		ret = -ENOMEM;
 48	
 49	return ret;
 50}
 51
 52static int eisa_eeprom_open(struct inode *inode, struct file *file)
 53{
 54	if (file->f_mode & FMODE_WRITE)
 55		return -EINVAL;
 56   
 57	return 0;
 58}
 59
 60static int eisa_eeprom_release(struct inode *inode, struct file *file)
 61{
 62	return 0;
 63}
 64
 65/*
 66 *	The various file operations we support.
 67 */
 68static const struct file_operations eisa_eeprom_fops = {
 69	.owner =	THIS_MODULE,
 70	.llseek =	eisa_eeprom_llseek,
 71	.read =		eisa_eeprom_read,
 72	.open =		eisa_eeprom_open,
 73	.release =	eisa_eeprom_release,
 74};
 75
 76static struct miscdevice eisa_eeprom_dev = {
 77	EISA_EEPROM_MINOR,
 78	"eisa_eeprom",
 79	&eisa_eeprom_fops
 80};
 81
 82static int __init eisa_eeprom_init(void)
 83{
 84	int retval;
 85
 86	if (!eisa_eeprom_addr)
 87		return -ENODEV;
 88
 89	retval = misc_register(&eisa_eeprom_dev);
 90	if (retval < 0) {
 91		printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
 92		return retval;
 93	}
 94
 95	printk(KERN_INFO "EISA EEPROM at 0x%px\n", eisa_eeprom_addr);
 96	return 0;
 97}
 98
 99MODULE_LICENSE("GPL");
100
101module_init(eisa_eeprom_init);

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* 
  3 *    EISA "eeprom" support routines
  4 *
  5 *    Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/init.h>
 10#include <linux/kernel.h>
 11#include <linux/miscdevice.h>
 12#include <linux/slab.h>
 13#include <linux/fs.h>
 14#include <asm/io.h>
 15#include <linux/uaccess.h>
 16#include <asm/eisa_eeprom.h>
 17
 18#define 	EISA_EEPROM_MINOR 241
 19
 20static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
 21{
 22	return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
 23}
 24
 25static ssize_t eisa_eeprom_read(struct file * file,
 26			      char __user *buf, size_t count, loff_t *ppos )
 27{
 28	unsigned char *tmp;
 29	ssize_t ret;
 30	int i;
 31	
 32	if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
 33		return 0;
 34	
 35	count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;
 36	tmp = kmalloc(count, GFP_KERNEL);
 37	if (tmp) {
 38		for (i = 0; i < count; i++)
 39			tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
 40
 41		if (copy_to_user (buf, tmp, count))
 42			ret = -EFAULT;
 43		else
 44			ret = count;
 45		kfree (tmp);
 46	} else
 47		ret = -ENOMEM;
 48	
 49	return ret;
 50}
 51
 52static int eisa_eeprom_open(struct inode *inode, struct file *file)
 53{
 54	if (file->f_mode & FMODE_WRITE)
 55		return -EINVAL;
 56   
 57	return 0;
 58}
 59
 60static int eisa_eeprom_release(struct inode *inode, struct file *file)
 61{
 62	return 0;
 63}
 64
 65/*
 66 *	The various file operations we support.
 67 */
 68static const struct file_operations eisa_eeprom_fops = {
 69	.owner =	THIS_MODULE,
 70	.llseek =	eisa_eeprom_llseek,
 71	.read =		eisa_eeprom_read,
 72	.open =		eisa_eeprom_open,
 73	.release =	eisa_eeprom_release,
 74};
 75
 76static struct miscdevice eisa_eeprom_dev = {
 77	EISA_EEPROM_MINOR,
 78	"eisa_eeprom",
 79	&eisa_eeprom_fops
 80};
 81
 82static int __init eisa_eeprom_init(void)
 83{
 84	int retval;
 85
 86	if (!eisa_eeprom_addr)
 87		return -ENODEV;
 88
 89	retval = misc_register(&eisa_eeprom_dev);
 90	if (retval < 0) {
 91		printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
 92		return retval;
 93	}
 94
 95	printk(KERN_INFO "EISA EEPROM at 0x%px\n", eisa_eeprom_addr);
 96	return 0;
 97}
 98
 99MODULE_LICENSE("GPL");
100
101module_init(eisa_eeprom_init);