[mirror_ubuntu-zesty-kernel.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/fs.h>
#include <asm/io.h>
#include <linux/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)
{
	return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
}

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>
	27	#include <linux/fs.h>
	28	#include <asm/io.h>
7c0f6ba6	29	#include <linux/uaccess.h>
1da177e4 LT	30	#include <asm/eisa_eeprom.h>
	31
	32	#define EISA_EEPROM_MINOR 241
	33
74797797	34	static loff_t eisa_eeprom_llseek(struct file *file, loff_t offset, int origin)
1da177e4	35	{
74797797	36	return fixed_size_llseek(file, offset, origin, HPEE_MAX_LENGTH);
1da177e4 LT	37	}
	38
	39	static ssize_t eisa_eeprom_read(struct file * file,
45dbe914	40	char __user buf, size_t count, loff_t ppos )
1da177e4 LT	41	{
	42	unsigned char *tmp;
	43	ssize_t ret;
	44	int i;
	45
6b4dbcd8	46	if (ppos < 0 \|\| ppos >= HPEE_MAX_LENGTH)
1da177e4 LT	47	return 0;
	48
	49	count = ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - ppos;
	50	tmp = kmalloc(count, GFP_KERNEL);
	51	if (tmp) {
	52	for (i = 0; i < count; i++)
	53	tmp[i] = readb(eisa_eeprom_addr+(*ppos)++);
	54
	55	if (copy_to_user (buf, tmp, count))
	56	ret = -EFAULT;
	57	else
	58	ret = count;
	59	kfree (tmp);
	60	} else
	61	ret = -ENOMEM;
	62
	63	return ret;
	64	}
	65
1da177e4 LT	66	static int eisa_eeprom_open(struct inode inode, struct file file)
1da177e4 LT	67	{
aeb5d727	68	if (file->f_mode & FMODE_WRITE)
1da177e4 LT	69	return -EINVAL;
	70
	71	return 0;
	72	}
	73
	74	static int eisa_eeprom_release(struct inode inode, struct file file)
	75	{
	76	return 0;
	77	}
	78
	79	/*
	80	* The various file operations we support.
	81	*/
d54b1fdb	82	static const struct file_operations eisa_eeprom_fops = {
1da177e4 LT	83	.owner = THIS_MODULE,
	84	.llseek = eisa_eeprom_llseek,
	85	.read = eisa_eeprom_read,
1da177e4 LT	86	.open = eisa_eeprom_open,
	87	.release = eisa_eeprom_release,
	88	};
	89
	90	static struct miscdevice eisa_eeprom_dev = {
	91	EISA_EEPROM_MINOR,
	92	"eisa_eeprom",
	93	&eisa_eeprom_fops
	94	};
	95
	96	static int __init eisa_eeprom_init(void)
	97	{
	98	int retval;
	99
	100	if (!eisa_eeprom_addr)
	101	return -ENODEV;
	102
	103	retval = misc_register(&eisa_eeprom_dev);
	104	if (retval < 0) {
	105	printk(KERN_ERR "EISA EEPROM: cannot register misc device.\n");
	106	return retval;
	107	}
	108
	109	printk(KERN_INFO "EISA EEPROM at 0x%p\n", eisa_eeprom_addr);
	110	return 0;
	111	}
	112
	113	MODULE_LICENSE("GPL");
	114
	115	module_init(eisa_eeprom_init);