/*
* linux/drivers/s390/block/dasd_cmb.c ($Revision: 1.9 $)
*
* Linux on zSeries Channel Measurement Facility support
* (dasd device driver interface)
*
* Copyright 2000,2003 IBM Corporation
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <asm/ccwdev.h>
#include <asm/cmb.h>
#include "dasd_int.h"
static int
dasd_ioctl_cmf_enable(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
device = bdev->bd_disk->private_data;
if (!device)
return -EINVAL;
return enable_cmf(device->cdev);
}
static int
dasd_ioctl_cmf_disable(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
device = bdev->bd_disk->private_data;
if (!device)
return -EINVAL;
return disable_cmf(device->cdev);
}
static int
dasd_ioctl_readall_cmb(struct block_device *bdev, int no, long args)
{
struct dasd_device *device;
struct cmbdata __user *udata;
struct cmbdata data;
size_t size;
int ret;
device = bdev->bd_disk->private_data;
if (!device)
return -EINVAL;
udata = (void __user *) args;
size = _IOC_SIZE(no);
if (!access_ok(VERIFY_WRITE, udata, size))
return -EFAULT;
ret = cmf_readall(device->cdev, &data);
if (ret)
return ret;
if (copy_to_user(udata, &data, min(size, sizeof(*udata))))
return -EFAULT;
return 0;
}
/* module initialization below here. dasd already provides a mechanism
* to dynamically register ioctl functions, so we simply use this. */
static inline int
ioctl_reg(unsigned int no, dasd_ioctl_fn_t handler)
{
return dasd_ioctl_no_register(THIS_MODULE, no, handler);
}
static inline void
ioctl_unreg(unsigned int no, dasd_ioctl_fn_t handler)
{
dasd_ioctl_no_unregister(THIS_MODULE, no, handler);
}
static void
dasd_cmf_exit(void)
{
ioctl_unreg(BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
ioctl_unreg(BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
ioctl_unreg(BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
}
static int __init
dasd_cmf_init(void)
{
int ret;
ret = ioctl_reg (BIODASDCMFENABLE, dasd_ioctl_cmf_enable);
if (ret)
goto err;
ret = ioctl_reg (BIODASDCMFDISABLE, dasd_ioctl_cmf_disable);
if (ret)
goto err;
ret = ioctl_reg (BIODASDREADALLCMB, dasd_ioctl_readall_cmb);
if (ret)
goto err;
return 0;
err:
dasd_cmf_exit();
return ret;
}
module_init(dasd_cmf_init);
module_exit(dasd_cmf_exit);
MODULE_AUTHOR("Arnd Bergmann <arndb@de.ibm.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("channel measurement facility interface for dasd\n"
"Copyright 2003 IBM Corporation\n");
