diff options
Diffstat (limited to 'drivers/parisc/eisa_eeprom.c')
-rw-r--r-- | drivers/parisc/eisa_eeprom.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/parisc/eisa_eeprom.c b/drivers/parisc/eisa_eeprom.c new file mode 100644 index 000000000000..3a1b4826e5c1 --- /dev/null +++ b/drivers/parisc/eisa_eeprom.c @@ -0,0 +1,134 @@ +/* + * EISA "eeprom" support routines + * + * Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/miscdevice.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/eisa_eeprom.h> + +#define EISA_EEPROM_MINOR 241 + +static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin ) +{ + switch (origin) { + case 0: + /* nothing to do */ + break; + case 1: + offset += file->f_pos; + break; + case 2: + offset += HPEE_MAX_LENGTH; + break; + } + return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL; +} + +static ssize_t eisa_eeprom_read(struct file * file, + char *buf, size_t count, loff_t *ppos ) +{ + unsigned char *tmp; + ssize_t ret; + int i; + + if (*ppos >= HPEE_MAX_LENGTH) + return 0; + + count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos; + tmp = kmalloc(count, GFP_KERNEL); + if (tmp) { + for (i = 0; i < count; i++) + tmp[i] = readb(eisa_eeprom_addr+(*ppos)++); + + if (copy_to_user (buf, tmp, count)) + ret = -EFAULT; + else + ret = count; + kfree (tmp); + } else + ret = -ENOMEM; + + return ret; +} + +static int eisa_eeprom_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, + unsigned long arg) +{ + return -ENOTTY; +} + +static int eisa_eeprom_open(struct inode *inode, struct file *file) +{ + if (file->f_mode & 2) + return -EINVAL; + + return 0; +} + +static int eisa_eeprom_release(struct inode *inode, struct file *file) +{ + return 0; +} + +/* + * The various file operations we support. + */ +static struct file_operations eisa_eeprom_fops = { + .owner = THIS_MODULE, + .llseek = eisa_eeprom_llseek, + .read = eisa_eeprom_read, + .ioctl = eisa_eeprom_ioctl, + .open = eisa_eeprom_open, + .release = eisa_eeprom_release, +}; + +static struct miscdevice eisa_eeprom_dev = { + EISA_EEPROM_MINOR, + "eisa_eeprom", + &eisa_eeprom_fops +}; + +static int __init eisa_eeprom_init(void) +{ + int retval; + + if (!eisa_eeprom_addr) + return -ENODEV; + + retval = misc_register(&eisa_eeprom_dev); + if (retval < 0) { + printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n"); + return retval; + } + + printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr); + return 0; +} + +MODULE_LICENSE("GPL"); + +module_init(eisa_eeprom_init); |