[net-next-2.6.git] / drivers / parisc / eisa_eeprom.c

/* 
 *    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/smp_lock.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 __user *buf, size_t count, loff_t *ppos )
{
	unsigned char *tmp;
	ssize_t ret;
	int i;
	
	if (*ppos < 0 || *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_open(struct inode *inode, struct file *file)
{
	if (file->f_mode & FMODE_WRITE)
		return -EINVAL;
   
	return 0;
}

static int eisa_eeprom_release(struct inode *inode, struct file *file)
{
	return 0;
}

/*
 *	The various file operations we support.
 */
static const struct file_operations eisa_eeprom_fops = {
	.owner =	THIS_MODULE,
	.llseek =	eisa_eeprom_llseek,
	.read =		eisa_eeprom_read,
	.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);
Commit	Line	Data
1da177e4 LT	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>
6044c319	27	#include <linux/smp_lock.h>
1da177e4 LT	28	#include <linux/fs.h>
	29	#include <asm/io.h>
	30	#include <asm/uaccess.h>
	31	#include <asm/eisa_eeprom.h>
	32
	33	#define EISA_EEPROM_MINOR 241
	34
	35	static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin )
	36	{
	37	switch (origin) {
	38	case 0:
	39	/* nothing to do */
	40	break;
	41	case 1:
	42	offset += file->f_pos;
	43	break;
	44	case 2:
	45	offset += HPEE_MAX_LENGTH;
	46	break;
	47	}
	48	return (offset >= 0 && offset < HPEE_MAX_LENGTH) ? (file->f_pos = offset) : -EINVAL;
	49	}
	50
	51	static ssize_t eisa_eeprom_read(struct file * file,
45dbe914	52	char __user buf, size_t count, loff_t ppos )
1da177e4 LT	53	{
	54	unsigned char *tmp;
	55	ssize_t ret;
	56	int i;
	57
6b4dbcd8	58	if (ppos < 0 \|\| ppos >= HPEE_MAX_LENGTH)
1da177e4 LT	59	return 0;
	60
	61	count = ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - ppos;
	62	tmp = kmalloc(count, GFP_KERNEL);
	63	if (tmp) {
	64	for (i = 0; i < count; i++)
	65	tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
	66
	67	if (copy_to_user (buf, tmp, count))
	68	ret = -EFAULT;
	69	else
	70	ret = count;
	71	kfree (tmp);
	72	} else
	73	ret = -ENOMEM;
	74
	75	return ret;
	76	}
	77
1da177e4 LT	78	static int eisa_eeprom_open(struct inode inode, struct file file)
1da177e4 LT	79	{
aeb5d727	80	if (file->f_mode & FMODE_WRITE)
1da177e4 LT	81	return -EINVAL;
	82
	83	return 0;
	84	}
	85
	86	static int eisa_eeprom_release(struct inode inode, struct file file)
	87	{
	88	return 0;
	89	}
	90
	91	/*
	92	* The various file operations we support.
	93	*/
d54b1fdb	94	static const struct file_operations eisa_eeprom_fops = {
1da177e4 LT	95	.owner = THIS_MODULE,
	96	.llseek = eisa_eeprom_llseek,
	97	.read = eisa_eeprom_read,
1da177e4 LT	98	.open = eisa_eeprom_open,
	99	.release = eisa_eeprom_release,
	100	};
	101
	102	static struct miscdevice eisa_eeprom_dev = {
	103	EISA_EEPROM_MINOR,
	104	"eisa_eeprom",
	105	&eisa_eeprom_fops
	106	};
	107
	108	static int __init eisa_eeprom_init(void)
	109	{
	110	int retval;
	111
	112	if (!eisa_eeprom_addr)
	113	return -ENODEV;
	114
	115	retval = misc_register(&eisa_eeprom_dev);
	116	if (retval < 0) {
	117	printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
	118	return retval;
	119	}
	120
	121	printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
	122	return 0;
	123	}
	124
	125	MODULE_LICENSE("GPL");
	126
	127	module_init(eisa_eeprom_init);