| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * EISA "eeprom" support routines |
| 3 | * |
| 4 | * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> |
| 5 | * |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/miscdevice.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/fs.h> |
| 28 | #include <asm/io.h> |
| 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/eisa_eeprom.h> |
| 31 | |
| 32 | #define EISA_EEPROM_MINOR 241 |
| 33 | |
| 34 | static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin ) |
| 35 | { |
| 36 | switch (origin) { |
| 37 | case 0: |
| 38 | /* nothing to do */ |
| 39 | break; |
| 40 | case 1: |
| 41 | offset += file->f_pos; |
| 42 | break; |
| 43 | case 2: |
| 44 | offset += HPEE_MAX_LENGTH; |
| 45 | break; |
| 46 | } |
| 47 | return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL; |
| 48 | } |
| 49 | |
| 50 | static ssize_t eisa_eeprom_read(struct file * file, |
| 51 | char *buf, size_t count, loff_t *ppos ) |
| 52 | { |
| 53 | unsigned char *tmp; |
| 54 | ssize_t ret; |
| 55 | int i; |
| 56 | |
| 57 | if (*ppos >= HPEE_MAX_LENGTH) |
| 58 | return 0; |
| 59 | |
| 60 | count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos; |
| 61 | tmp = kmalloc(count, GFP_KERNEL); |
| 62 | if (tmp) { |
| 63 | for (i = 0; i < count; i++) |
| 64 | tmp[i] = readb(eisa_eeprom_addr+(*ppos)++); |
| 65 | |
| 66 | if (copy_to_user (buf, tmp, count)) |
| 67 | ret = -EFAULT; |
| 68 | else |
| 69 | ret = count; |
| 70 | kfree (tmp); |
| 71 | } else |
| 72 | ret = -ENOMEM; |
| 73 | |
| 74 | return ret; |
| 75 | } |
| 76 | |
| 77 | static int eisa_eeprom_ioctl(struct inode *inode, struct file *file, |
| 78 | unsigned int cmd, |
| 79 | unsigned long arg) |
| 80 | { |
| 81 | return -ENOTTY; |
| 82 | } |
| 83 | |
| 84 | static int eisa_eeprom_open(struct inode *inode, struct file *file) |
| 85 | { |
| 86 | if (file->f_mode & 2) |
| 87 | return -EINVAL; |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static int eisa_eeprom_release(struct inode *inode, struct file *file) |
| 93 | { |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * The various file operations we support. |
| 99 | */ |
| 100 | static struct file_operations eisa_eeprom_fops = { |
| 101 | .owner = THIS_MODULE, |
| 102 | .llseek = eisa_eeprom_llseek, |
| 103 | .read = eisa_eeprom_read, |
| 104 | .ioctl = eisa_eeprom_ioctl, |
| 105 | .open = eisa_eeprom_open, |
| 106 | .release = eisa_eeprom_release, |
| 107 | }; |
| 108 | |
| 109 | static struct miscdevice eisa_eeprom_dev = { |
| 110 | EISA_EEPROM_MINOR, |
| 111 | "eisa_eeprom", |
| 112 | &eisa_eeprom_fops |
| 113 | }; |
| 114 | |
| 115 | static int __init eisa_eeprom_init(void) |
| 116 | { |
| 117 | int retval; |
| 118 | |
| 119 | if (!eisa_eeprom_addr) |
| 120 | return -ENODEV; |
| 121 | |
| 122 | retval = misc_register(&eisa_eeprom_dev); |
| 123 | if (retval < 0) { |
| 124 | printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n"); |
| 125 | return retval; |
| 126 | } |
| 127 | |
| 128 | printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr); |
| 129 | return 0; |
| 130 | } |
| 131 | |
| 132 | MODULE_LICENSE("GPL"); |
| 133 | |
| 134 | module_init(eisa_eeprom_init); |