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101 lines
2.0 KiB
101 lines
2.0 KiB
// 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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