drivers/scsi/arcmsr/arcmsr_attr.c - linux - Git at Google

 /*
 *******************************************************************************
 **        O.S   : Linux
 **   FILE NAME  : arcmsr_attr.c
 **        BY    : Nick Cheng
 **   Description: attributes exported to sysfs and device host
 *******************************************************************************
 ** Copyright (C) 2002 - 2005, Areca Technology Corporation All rights reserved
 **
 **     Web site: www.areca.com.tw
 **       E-mail: support@areca.com.tw
 **
 ** This program is free software; you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License version 2 as
 ** published by the Free Software Foundation.
 ** 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.
 *******************************************************************************
 ** Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions
 ** are met:
 ** 1. Redistributions of source code must retain the above copyright
 **    notice, this list of conditions and the following disclaimer.
 ** 2. Redistributions in binary form must reproduce the above copyright
 **    notice, this list of conditions and the following disclaimer in the
 **    documentation and/or other materials provided with the distribution.
 ** 3. The name of the author may not be used to endorse or promote products
 **    derived from this software without specific prior written permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,BUT
 ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION)HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF
 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************
 ** For history of changes, see Documentation/scsi/ChangeLog.arcmsr
 **     Firmware Specification, see Documentation/scsi/arcmsr_spec.rst
 *******************************************************************************
 */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/circ_buf.h>

 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
 #include "arcmsr.h"

 static ssize_t arcmsr_sysfs_iop_message_read(struct file *filp,
 					     struct kobject *kobj,
 					     struct bin_attribute *bin,
 					     char *buf, loff_t off,
 					     size_t count)
 {
 	struct device *dev = container_of(kobj,struct device,kobj);
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
 	uint8_t *ptmpQbuffer;
 	int32_t allxfer_len = 0;
 	unsigned long flags;

 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;

 	/* do message unit read. */
 	ptmpQbuffer = (uint8_t *)buf;
 	spin_lock_irqsave(&acb->rqbuffer_lock, flags);
 	if (acb->rqbuf_getIndex != acb->rqbuf_putIndex) {
 		unsigned int tail = acb->rqbuf_getIndex;
 		unsigned int head = acb->rqbuf_putIndex;
 		unsigned int cnt_to_end = CIRC_CNT_TO_END(head, tail, ARCMSR_MAX_QBUFFER);

 		allxfer_len = CIRC_CNT(head, tail, ARCMSR_MAX_QBUFFER);
 		if (allxfer_len > ARCMSR_API_DATA_BUFLEN)
 			allxfer_len = ARCMSR_API_DATA_BUFLEN;

 		if (allxfer_len <= cnt_to_end)
 			memcpy(ptmpQbuffer, acb->rqbuffer + tail, allxfer_len);
 		else {
 			memcpy(ptmpQbuffer, acb->rqbuffer + tail, cnt_to_end);
 			memcpy(ptmpQbuffer + cnt_to_end, acb->rqbuffer, allxfer_len - cnt_to_end);
 		}
 		acb->rqbuf_getIndex = (acb->rqbuf_getIndex + allxfer_len) % ARCMSR_MAX_QBUFFER;
 	}
 	if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
 		struct QBUFFER __iomem *prbuffer;
 		acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
 		prbuffer = arcmsr_get_iop_rqbuffer(acb);
 		if (arcmsr_Read_iop_rqbuffer_data(acb, prbuffer) == 0)
 			acb->acb_flags |= ACB_F_IOPDATA_OVERFLOW;
 	}
 	spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
 	return allxfer_len;
 }

 static ssize_t arcmsr_sysfs_iop_message_write(struct file *filp,
 					      struct kobject *kobj,
 					      struct bin_attribute *bin,
 					      char *buf, loff_t off,
 					      size_t count)
 {
 	struct device *dev = container_of(kobj,struct device,kobj);
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
 	int32_t user_len, cnt2end;
 	uint8_t *pQbuffer, *ptmpuserbuffer;
 	unsigned long flags;

 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
 	if (count > ARCMSR_API_DATA_BUFLEN)
 		return -EINVAL;
 	/* do message unit write. */
 	ptmpuserbuffer = (uint8_t *)buf;
 	user_len = (int32_t)count;
 	spin_lock_irqsave(&acb->wqbuffer_lock, flags);
 	if (acb->wqbuf_putIndex != acb->wqbuf_getIndex) {
 		arcmsr_write_ioctldata2iop(acb);
 		spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
 		return 0;	/*need retry*/
 	} else {
 		pQbuffer = &acb->wqbuffer[acb->wqbuf_putIndex];
 		cnt2end = ARCMSR_MAX_QBUFFER - acb->wqbuf_putIndex;
 		if (user_len > cnt2end) {
 			memcpy(pQbuffer, ptmpuserbuffer, cnt2end);
 			ptmpuserbuffer += cnt2end;
 			user_len -= cnt2end;
 			acb->wqbuf_putIndex = 0;
 			pQbuffer = acb->wqbuffer;
 		}
 		memcpy(pQbuffer, ptmpuserbuffer, user_len);
 		acb->wqbuf_putIndex += user_len;
 		acb->wqbuf_putIndex %= ARCMSR_MAX_QBUFFER;
 		if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_CLEARED) {
 			acb->acb_flags &=
 				~ACB_F_MESSAGE_WQBUFFER_CLEARED;
 			arcmsr_write_ioctldata2iop(acb);
 		}
 		spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
 		return count;
 	}
 }

 static ssize_t arcmsr_sysfs_iop_message_clear(struct file *filp,
 					      struct kobject *kobj,
 					      struct bin_attribute *bin,
 					      char *buf, loff_t off,
 					      size_t count)
 {
 	struct device *dev = container_of(kobj,struct device,kobj);
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb = (struct AdapterControlBlock *) host->hostdata;
 	uint8_t *pQbuffer;
 	unsigned long flags;

 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;

 	arcmsr_clear_iop2drv_rqueue_buffer(acb);
 	acb->acb_flags |=
 		(ACB_F_MESSAGE_WQBUFFER_CLEARED
 		| ACB_F_MESSAGE_RQBUFFER_CLEARED
 		| ACB_F_MESSAGE_WQBUFFER_READED);
 	spin_lock_irqsave(&acb->rqbuffer_lock, flags);
 	acb->rqbuf_getIndex = 0;
 	acb->rqbuf_putIndex = 0;
 	spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
 	spin_lock_irqsave(&acb->wqbuffer_lock, flags);
 	acb->wqbuf_getIndex = 0;
 	acb->wqbuf_putIndex = 0;
 	spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
 	pQbuffer = acb->rqbuffer;
 	memset(pQbuffer, 0, sizeof (struct QBUFFER));
 	pQbuffer = acb->wqbuffer;
 	memset(pQbuffer, 0, sizeof (struct QBUFFER));
 	return 1;
 }

 static const struct bin_attribute arcmsr_sysfs_message_read_attr = {
 	.attr = {
 		.name = "mu_read",
 		.mode = S_IRUSR ,
 	},
 	.size = ARCMSR_API_DATA_BUFLEN,
 	.read = arcmsr_sysfs_iop_message_read,
 };

 static const struct bin_attribute arcmsr_sysfs_message_write_attr = {
 	.attr = {
 		.name = "mu_write",
 		.mode = S_IWUSR,
 	},
 	.size = ARCMSR_API_DATA_BUFLEN,
 	.write = arcmsr_sysfs_iop_message_write,
 };

 static const struct bin_attribute arcmsr_sysfs_message_clear_attr = {
 	.attr = {
 		.name = "mu_clear",
 		.mode = S_IWUSR,
 	},
 	.size = 1,
 	.write = arcmsr_sysfs_iop_message_clear,
 };

 int arcmsr_alloc_sysfs_attr(struct AdapterControlBlock *acb)
 {
 	struct Scsi_Host *host = acb->host;
 	int error;

 	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
 	if (error) {
 		printk(KERN_ERR "arcmsr: alloc sysfs mu_read failed\n");
 		goto error_bin_file_message_read;
 	}
 	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
 	if (error) {
 		printk(KERN_ERR "arcmsr: alloc sysfs mu_write failed\n");
 		goto error_bin_file_message_write;
 	}
 	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_clear_attr);
 	if (error) {
 		printk(KERN_ERR "arcmsr: alloc sysfs mu_clear failed\n");
 		goto error_bin_file_message_clear;
 	}
 	return 0;
 error_bin_file_message_clear:
 	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
 error_bin_file_message_write:
 	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
 error_bin_file_message_read:
 	return error;
 }

 void arcmsr_free_sysfs_attr(struct AdapterControlBlock *acb)
 {
 	struct Scsi_Host *host = acb->host;

 	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_clear_attr);
 	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
 	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
 }


 static ssize_t
 arcmsr_attr_host_driver_version(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE,
 			"%s\n",
 			ARCMSR_DRIVER_VERSION);
 }

 static ssize_t
 arcmsr_attr_host_driver_posted_cmd(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			atomic_read(&acb->ccboutstandingcount));
 }

 static ssize_t
 arcmsr_attr_host_driver_reset(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->num_resets);
 }

 static ssize_t
 arcmsr_attr_host_driver_abort(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->num_aborts);
 }

 static ssize_t
 arcmsr_attr_host_fw_model(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;
 	return snprintf(buf, PAGE_SIZE,
 			"%s\n",
 			acb->firm_model);
 }

 static ssize_t
 arcmsr_attr_host_fw_version(struct device *dev,
 			    struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 			(struct AdapterControlBlock *) host->hostdata;

 	return snprintf(buf, PAGE_SIZE,
 			"%s\n",
 			acb->firm_version);
 }

 static ssize_t
 arcmsr_attr_host_fw_request_len(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;

 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->firm_request_len);
 }

 static ssize_t
 arcmsr_attr_host_fw_numbers_queue(struct device *dev,
 				  struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;

 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->firm_numbers_queue);
 }

 static ssize_t
 arcmsr_attr_host_fw_sdram_size(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;

 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->firm_sdram_size);
 }

 static ssize_t
 arcmsr_attr_host_fw_hd_channels(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct Scsi_Host *host = class_to_shost(dev);
 	struct AdapterControlBlock *acb =
 		(struct AdapterControlBlock *) host->hostdata;

 	return snprintf(buf, PAGE_SIZE,
 			"%4d\n",
 			acb->firm_hd_channels);
 }

 static DEVICE_ATTR(host_driver_version, S_IRUGO, arcmsr_attr_host_driver_version, NULL);
 static DEVICE_ATTR(host_driver_posted_cmd, S_IRUGO, arcmsr_attr_host_driver_posted_cmd, NULL);
 static DEVICE_ATTR(host_driver_reset, S_IRUGO, arcmsr_attr_host_driver_reset, NULL);
 static DEVICE_ATTR(host_driver_abort, S_IRUGO, arcmsr_attr_host_driver_abort, NULL);
 static DEVICE_ATTR(host_fw_model, S_IRUGO, arcmsr_attr_host_fw_model, NULL);
 static DEVICE_ATTR(host_fw_version, S_IRUGO, arcmsr_attr_host_fw_version, NULL);
 static DEVICE_ATTR(host_fw_request_len, S_IRUGO, arcmsr_attr_host_fw_request_len, NULL);
 static DEVICE_ATTR(host_fw_numbers_queue, S_IRUGO, arcmsr_attr_host_fw_numbers_queue, NULL);
 static DEVICE_ATTR(host_fw_sdram_size, S_IRUGO, arcmsr_attr_host_fw_sdram_size, NULL);
 static DEVICE_ATTR(host_fw_hd_channels, S_IRUGO, arcmsr_attr_host_fw_hd_channels, NULL);

 static struct attribute *arcmsr_host_attrs[] = {
 	&dev_attr_host_driver_version.attr,
 	&dev_attr_host_driver_posted_cmd.attr,
 	&dev_attr_host_driver_reset.attr,
 	&dev_attr_host_driver_abort.attr,
 	&dev_attr_host_fw_model.attr,
 	&dev_attr_host_fw_version.attr,
 	&dev_attr_host_fw_request_len.attr,
 	&dev_attr_host_fw_numbers_queue.attr,
 	&dev_attr_host_fw_sdram_size.attr,
 	&dev_attr_host_fw_hd_channels.attr,
 	NULL,
 };

 static const struct attribute_group arcmsr_host_attr_group = {
 	.attrs = arcmsr_host_attrs,
 };

 const struct attribute_group *arcmsr_host_groups[] = {
 	&arcmsr_host_attr_group,
 	NULL
 };
	/*
	*******************************************************************************
	** O.S : Linux
	** FILE NAME : arcmsr_attr.c
	** BY : Nick Cheng
	** Description: attributes exported to sysfs and device host
	*******************************************************************************
	** Copyright (C) 2002 - 2005, Areca Technology Corporation All rights reserved
	**
	** Web site: www.areca.com.tw
	** E-mail: support@areca.com.tw
	**
	** This program is free software; you can redistribute it and/or modify
	** it under the terms of the GNU General Public License version 2 as
	** published by the Free Software Foundation.
	** 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.
	*******************************************************************************
	** Redistribution and use in source and binary forms, with or without
	** modification, are permitted provided that the following conditions
	** are met:
	** 1. Redistributions of source code must retain the above copyright
	** notice, this list of conditions and the following disclaimer.
	** 2. Redistributions in binary form must reproduce the above copyright
	** notice, this list of conditions and the following disclaimer in the
	** documentation and/or other materials provided with the distribution.
	** 3. The name of the author may not be used to endorse or promote products
	** derived from this software without specific prior written permission.
	**
	** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING,BUT
	** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	** DATA, OR PROFITS; OR BUSINESS INTERRUPTION)HOWEVER CAUSED AND ON ANY
	** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	** (INCLUDING NEGLIGENCE OR OTHERWISE)ARISING IN ANY WAY OUT OF THE USE OF
	** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*******************************************************************************
	** For history of changes, see Documentation/scsi/ChangeLog.arcmsr
	** Firmware Specification, see Documentation/scsi/arcmsr_spec.rst
	*******************************************************************************
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/pci.h>
	#include <linux/circ_buf.h>

	#include <scsi/scsi_cmnd.h>
	#include <scsi/scsi_device.h>
	#include <scsi/scsi_host.h>
	#include <scsi/scsi_transport.h>
	#include "arcmsr.h"

	static ssize_t arcmsr_sysfs_iop_message_read(struct file *filp,
	struct kobject *kobj,
	struct bin_attribute *bin,
	char *buf, loff_t off,
	size_t count)
	{
	struct device *dev = container_of(kobj,struct device,kobj);
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock acb = (struct AdapterControlBlock ) host->hostdata;
	uint8_t *ptmpQbuffer;
	int32_t allxfer_len = 0;
	unsigned long flags;

	if (!capable(CAP_SYS_ADMIN))
	return -EACCES;

	/* do message unit read. */
	ptmpQbuffer = (uint8_t *)buf;
	spin_lock_irqsave(&acb->rqbuffer_lock, flags);
	if (acb->rqbuf_getIndex != acb->rqbuf_putIndex) {
	unsigned int tail = acb->rqbuf_getIndex;
	unsigned int head = acb->rqbuf_putIndex;
	unsigned int cnt_to_end = CIRC_CNT_TO_END(head, tail, ARCMSR_MAX_QBUFFER);

	allxfer_len = CIRC_CNT(head, tail, ARCMSR_MAX_QBUFFER);
	if (allxfer_len > ARCMSR_API_DATA_BUFLEN)
	allxfer_len = ARCMSR_API_DATA_BUFLEN;

	if (allxfer_len <= cnt_to_end)
	memcpy(ptmpQbuffer, acb->rqbuffer + tail, allxfer_len);
	else {
	memcpy(ptmpQbuffer, acb->rqbuffer + tail, cnt_to_end);
	memcpy(ptmpQbuffer + cnt_to_end, acb->rqbuffer, allxfer_len - cnt_to_end);
	}
	acb->rqbuf_getIndex = (acb->rqbuf_getIndex + allxfer_len) % ARCMSR_MAX_QBUFFER;
	}
	if (acb->acb_flags & ACB_F_IOPDATA_OVERFLOW) {
	struct QBUFFER __iomem *prbuffer;
	acb->acb_flags &= ~ACB_F_IOPDATA_OVERFLOW;
	prbuffer = arcmsr_get_iop_rqbuffer(acb);
	if (arcmsr_Read_iop_rqbuffer_data(acb, prbuffer) == 0)
	acb->acb_flags \|= ACB_F_IOPDATA_OVERFLOW;
	}
	spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
	return allxfer_len;
	}

	static ssize_t arcmsr_sysfs_iop_message_write(struct file *filp,
	struct kobject *kobj,
	struct bin_attribute *bin,
	char *buf, loff_t off,
	size_t count)
	{
	struct device *dev = container_of(kobj,struct device,kobj);
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock acb = (struct AdapterControlBlock ) host->hostdata;
	int32_t user_len, cnt2end;
	uint8_t pQbuffer, ptmpuserbuffer;
	unsigned long flags;

	if (!capable(CAP_SYS_ADMIN))
	return -EACCES;
	if (count > ARCMSR_API_DATA_BUFLEN)
	return -EINVAL;
	/* do message unit write. */
	ptmpuserbuffer = (uint8_t *)buf;
	user_len = (int32_t)count;
	spin_lock_irqsave(&acb->wqbuffer_lock, flags);
	if (acb->wqbuf_putIndex != acb->wqbuf_getIndex) {
	arcmsr_write_ioctldata2iop(acb);
	spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
	return 0; /need retry/
	} else {
	pQbuffer = &acb->wqbuffer[acb->wqbuf_putIndex];
	cnt2end = ARCMSR_MAX_QBUFFER - acb->wqbuf_putIndex;
	if (user_len > cnt2end) {
	memcpy(pQbuffer, ptmpuserbuffer, cnt2end);
	ptmpuserbuffer += cnt2end;
	user_len -= cnt2end;
	acb->wqbuf_putIndex = 0;
	pQbuffer = acb->wqbuffer;
	}
	memcpy(pQbuffer, ptmpuserbuffer, user_len);
	acb->wqbuf_putIndex += user_len;
	acb->wqbuf_putIndex %= ARCMSR_MAX_QBUFFER;
	if (acb->acb_flags & ACB_F_MESSAGE_WQBUFFER_CLEARED) {
	acb->acb_flags &=
	~ACB_F_MESSAGE_WQBUFFER_CLEARED;
	arcmsr_write_ioctldata2iop(acb);
	}
	spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
	return count;
	}
	}

	static ssize_t arcmsr_sysfs_iop_message_clear(struct file *filp,
	struct kobject *kobj,
	struct bin_attribute *bin,
	char *buf, loff_t off,
	size_t count)
	{
	struct device *dev = container_of(kobj,struct device,kobj);
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock acb = (struct AdapterControlBlock ) host->hostdata;
	uint8_t *pQbuffer;
	unsigned long flags;

	if (!capable(CAP_SYS_ADMIN))
	return -EACCES;

	arcmsr_clear_iop2drv_rqueue_buffer(acb);
	acb->acb_flags \|=
	(ACB_F_MESSAGE_WQBUFFER_CLEARED
	\| ACB_F_MESSAGE_RQBUFFER_CLEARED
	\| ACB_F_MESSAGE_WQBUFFER_READED);
	spin_lock_irqsave(&acb->rqbuffer_lock, flags);
	acb->rqbuf_getIndex = 0;
	acb->rqbuf_putIndex = 0;
	spin_unlock_irqrestore(&acb->rqbuffer_lock, flags);
	spin_lock_irqsave(&acb->wqbuffer_lock, flags);
	acb->wqbuf_getIndex = 0;
	acb->wqbuf_putIndex = 0;
	spin_unlock_irqrestore(&acb->wqbuffer_lock, flags);
	pQbuffer = acb->rqbuffer;
	memset(pQbuffer, 0, sizeof (struct QBUFFER));
	pQbuffer = acb->wqbuffer;
	memset(pQbuffer, 0, sizeof (struct QBUFFER));
	return 1;
	}

	static const struct bin_attribute arcmsr_sysfs_message_read_attr = {
	.attr = {
	.name = "mu_read",
	.mode = S_IRUSR ,
	},
	.size = ARCMSR_API_DATA_BUFLEN,
	.read = arcmsr_sysfs_iop_message_read,
	};

	static const struct bin_attribute arcmsr_sysfs_message_write_attr = {
	.attr = {
	.name = "mu_write",
	.mode = S_IWUSR,
	},
	.size = ARCMSR_API_DATA_BUFLEN,
	.write = arcmsr_sysfs_iop_message_write,
	};

	static const struct bin_attribute arcmsr_sysfs_message_clear_attr = {
	.attr = {
	.name = "mu_clear",
	.mode = S_IWUSR,
	},
	.size = 1,
	.write = arcmsr_sysfs_iop_message_clear,
	};

	int arcmsr_alloc_sysfs_attr(struct AdapterControlBlock *acb)
	{
	struct Scsi_Host *host = acb->host;
	int error;

	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
	if (error) {
	printk(KERN_ERR "arcmsr: alloc sysfs mu_read failed\n");
	goto error_bin_file_message_read;
	}
	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
	if (error) {
	printk(KERN_ERR "arcmsr: alloc sysfs mu_write failed\n");
	goto error_bin_file_message_write;
	}
	error = sysfs_create_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_clear_attr);
	if (error) {
	printk(KERN_ERR "arcmsr: alloc sysfs mu_clear failed\n");
	goto error_bin_file_message_clear;
	}
	return 0;
	error_bin_file_message_clear:
	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
	error_bin_file_message_write:
	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
	error_bin_file_message_read:
	return error;
	}

	void arcmsr_free_sysfs_attr(struct AdapterControlBlock *acb)
	{
	struct Scsi_Host *host = acb->host;

	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_clear_attr);
	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_write_attr);
	sysfs_remove_bin_file(&host->shost_dev.kobj, &arcmsr_sysfs_message_read_attr);
	}


	static ssize_t
	arcmsr_attr_host_driver_version(struct device *dev,
	struct device_attribute attr, char buf)
	{
	return snprintf(buf, PAGE_SIZE,
	"%s\n",
	ARCMSR_DRIVER_VERSION);
	}

	static ssize_t
	arcmsr_attr_host_driver_posted_cmd(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;
	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	atomic_read(&acb->ccboutstandingcount));
	}

	static ssize_t
	arcmsr_attr_host_driver_reset(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;
	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->num_resets);
	}

	static ssize_t
	arcmsr_attr_host_driver_abort(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;
	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->num_aborts);
	}

	static ssize_t
	arcmsr_attr_host_fw_model(struct device dev, struct device_attribute attr,
	char *buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;
	return snprintf(buf, PAGE_SIZE,
	"%s\n",
	acb->firm_model);
	}

	static ssize_t
	arcmsr_attr_host_fw_version(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;

	return snprintf(buf, PAGE_SIZE,
	"%s\n",
	acb->firm_version);
	}

	static ssize_t
	arcmsr_attr_host_fw_request_len(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;

	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->firm_request_len);
	}

	static ssize_t
	arcmsr_attr_host_fw_numbers_queue(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;

	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->firm_numbers_queue);
	}

	static ssize_t
	arcmsr_attr_host_fw_sdram_size(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;

	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->firm_sdram_size);
	}

	static ssize_t
	arcmsr_attr_host_fw_hd_channels(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct Scsi_Host *host = class_to_shost(dev);
	struct AdapterControlBlock *acb =
	(struct AdapterControlBlock *) host->hostdata;

	return snprintf(buf, PAGE_SIZE,
	"%4d\n",
	acb->firm_hd_channels);
	}

	static DEVICE_ATTR(host_driver_version, S_IRUGO, arcmsr_attr_host_driver_version, NULL);
	static DEVICE_ATTR(host_driver_posted_cmd, S_IRUGO, arcmsr_attr_host_driver_posted_cmd, NULL);
	static DEVICE_ATTR(host_driver_reset, S_IRUGO, arcmsr_attr_host_driver_reset, NULL);
	static DEVICE_ATTR(host_driver_abort, S_IRUGO, arcmsr_attr_host_driver_abort, NULL);
	static DEVICE_ATTR(host_fw_model, S_IRUGO, arcmsr_attr_host_fw_model, NULL);
	static DEVICE_ATTR(host_fw_version, S_IRUGO, arcmsr_attr_host_fw_version, NULL);
	static DEVICE_ATTR(host_fw_request_len, S_IRUGO, arcmsr_attr_host_fw_request_len, NULL);
	static DEVICE_ATTR(host_fw_numbers_queue, S_IRUGO, arcmsr_attr_host_fw_numbers_queue, NULL);
	static DEVICE_ATTR(host_fw_sdram_size, S_IRUGO, arcmsr_attr_host_fw_sdram_size, NULL);
	static DEVICE_ATTR(host_fw_hd_channels, S_IRUGO, arcmsr_attr_host_fw_hd_channels, NULL);

	static struct attribute *arcmsr_host_attrs[] = {
	&dev_attr_host_driver_version.attr,
	&dev_attr_host_driver_posted_cmd.attr,
	&dev_attr_host_driver_reset.attr,
	&dev_attr_host_driver_abort.attr,
	&dev_attr_host_fw_model.attr,
	&dev_attr_host_fw_version.attr,
	&dev_attr_host_fw_request_len.attr,
	&dev_attr_host_fw_numbers_queue.attr,
	&dev_attr_host_fw_sdram_size.attr,
	&dev_attr_host_fw_hd_channels.attr,
	NULL,
	};

	static const struct attribute_group arcmsr_host_attr_group = {
	.attrs = arcmsr_host_attrs,
	};

	const struct attribute_group *arcmsr_host_groups[] = {
	&arcmsr_host_attr_group,
	NULL
	};