/* * 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 intdasd_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 intdasd_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 intdasd_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 intioctl_reg(unsigned int no, dasd_ioctl_fn_t handler){	return dasd_ioctl_no_register(THIS_MODULE, no, handler);}static inline voidioctl_unreg(unsigned int no, dasd_ioctl_fn_t handler){	dasd_ioctl_no_unregister(THIS_MODULE, no, handler);}static voiddasd_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 __initdasd_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");