[RFC PATCH 10/13] Intel(R) MEI Driver

[Oren Weil]

diff --git a/drivers/char/mei/main.c b/drivers/char/mei/main.c
new file mode 100644
index 0000000..82ac436
--- /dev/null
+++ b/drivers/char/mei/main.c
@@ -0,0 +1,1466 @@
+/*
+ *
+ * Intel(R) Management Engine Interface (Intel(R) MEI) Linux driver
+ * Copyright (c) 2003-2011, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/aio.h>
+#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/version.h>
+#include <linux/sched.h>
+
+#include "mei.h"
+#include "interface.h"
+#include "mei_version.h"
+
+
+#define MEI_READ_TIMEOUT 45
+#define MEI_DRIVER_NAME	"mei"
+#define MEI_DEV_NAME "mei"
+
+/*
+ *  mei driver strings
+ */
+static char mei_driver_name[] = MEI_DRIVER_NAME;
+static const char mei_driver_string[] = "Intel(R) Management Engine Interface";
+static const char mei_driver_version[] = MEI_DRIVER_VERSION;
+
+#ifdef MEI_DEBUG
+int mei_debug = 1;
+#else
+int mei_debug;
+#endif
+MODULE_PARM_DESC(mei_debug,  "Debug enabled or not");
+module_param(mei_debug, int, 0644);
+
+
+
+/* mei char device for registration */
+static struct cdev mei_cdev;
+
+/* major number for device */
+static int mei_major;
+/* The device pointer */
+/* Currently this driver works as long as there is only a single AMT device. */
+static struct pci_dev *mei_device;
+
+static struct class *mei_class;
+
+
+/* mei_pci_tbl - PCI Device ID Table */
+static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
+	/* required last entry */
+	{0, }
+};
+
+MODULE_DEVICE_TABLE(pci, mei_pci_tbl);
+
+#ifdef CONFIG_PM
+static u16 g_sus_wd_timeout;
+#endif
+
+static DEFINE_MUTEX(mei_mutex);
+
+/**
+ * mei_probe - Device Initialization Routine
+ *
+ * @pdev: PCI device structure
+ * @ent: entry in kcs_pci_tbl
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int __devinit mei_probe(struct pci_dev *pdev,
+				const struct pci_device_id *ent)
+{
+	struct iamt_mei_device *dev;
+	int i, err;
+
+	mutex_lock(&mei_mutex);
+	if (mei_device) {
+		err = -EEXIST;
+		goto end;
+	}
+	/* enable pci dev */
+	err = pci_enable_device(pdev);
+	if (err) {
+		printk(KERN_ERR "mei: Failed to enable pci device.\n");
+		goto end;
+	}
+	/* set PCI host mastering  */
+	pci_set_master(pdev);
+	/* pci request regions for mei driver */
+	err = pci_request_regions(pdev, mei_driver_name);
+	if (err) {
+		printk(KERN_ERR "mei: Failed to get pci regions.\n");
+		goto disable_device;
+	}
+	/* allocates and initializes the mei dev structure */
+	dev = init_mei_device(pdev);
+	if (!dev) {
+		err = -ENOMEM;
+		goto release_regions;
+	}
+	/* mapping  IO device memory */
+	for (i = 0; i <= 5; i++) {
+		if (pci_resource_len(pdev, i) == 0)
+			continue;
+		if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
+			printk(KERN_ERR "mei: mei has IO ports.\n");
+			goto free_device;
+		} else if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
+			if (dev->mem_base) {
+				printk(KERN_ERR
+					"mei: Too many mem addresses.\n");
+				goto free_device;
+			}
+			dev->mem_base = pci_resource_start(pdev, i);
+			dev->mem_length = pci_resource_len(pdev, i);
+		}
+	}
+	if (!dev->mem_base) {
+		printk(KERN_ERR "mei: No address to use.\n");
+		err = -ENODEV;
+		goto free_device;
+	}
+	dev->mem_addr = ioremap_nocache(dev->mem_base, dev->mem_length);
+	if (!dev->mem_addr) {
+		printk(KERN_ERR "mei: Remap IO device memory failure.\n");
+		err = -ENOMEM;
+		goto free_device;
+	}
+	/* request and enable interrupt   */
+	err = request_threaded_irq(pdev->irq,
+			mei_interrupt_quick_handler,
+			mei_interrupt_thread_handler,
+			IRQF_SHARED, mei_driver_name, dev);
+	if (err) {
+		printk(KERN_ERR "mei: request_threaded_irq failure. irq = %d\n",
+		       pdev->irq);
+		goto unmap_memory;
+	}
+	INIT_DELAYED_WORK(&dev->wd_work, mei_wd_timer);
+	if (mei_hw_init(dev)) {
+		printk(KERN_ERR "mei: Init hw failure.\n");
+		err = -ENODEV;
+		goto release_irq;
+	}
+	mei_device = pdev;
+	pci_set_drvdata(pdev, dev);
+	schedule_delayed_work(&dev->wd_work, HZ);
+
+#ifdef CONFIG_PM
+	g_sus_wd_timeout = 0;
+#endif
+	mutex_unlock(&mei_mutex);
+	printk(KERN_INFO "mei: driver initialization successful.\n");
+	return 0;
+
+release_irq:
+	/* disable interrupts */
+	dev->host_hw_state = get_host_hw_state(dev);
+	mei_csr_disable_interrupts(dev);
+	flush_scheduled_work();
+	free_irq(pdev->irq, dev);
+unmap_memory:
+	if (dev->mem_addr)
+		iounmap(dev->mem_addr);
+free_device:
+	kfree(dev);
+release_regions:
+	pci_release_regions(pdev);
+disable_device:
+	pci_disable_device(pdev);
+end:
+	mutex_unlock(&mei_mutex);
+	printk(KERN_ERR "mei: driver initialization failed.\n");
+	return err;
+}
+
+/**
+ * mei_remove - Device Removal Routine
+ *
+ * @pdev: PCI device structure
+ *
+ * mei_remove is called by the PCI subsystem to alert the driver
+ * that it should release a PCI device.
+ */
+static void __devexit mei_remove(struct pci_dev *pdev)
+{
+	struct iamt_mei_device *dev;
+
+	if (mei_device != pdev)
+		return;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return;
+
+	mutex_lock(&dev->device_lock);
+	cancel_delayed_work(&dev->wd_work);
+	if (dev->wd_file_ext.state == MEI_FILE_CONNECTED && dev->wd_timeout) {
+		dev->wd_timeout = 0;
+		dev->wd_due_counter = 0;
+		memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
+		dev->stop = 1;
+		if (dev->host_buffer_is_empty &&
+		    flow_ctrl_creds(dev, &dev->wd_file_ext)) {
+			dev->host_buffer_is_empty = 0;
+
+			if (!mei_send_wd(dev))
+				DBG("send stop WD failed\n");
+			else
+				flow_ctrl_reduce(dev, &dev->wd_file_ext);
+
+			dev->wd_pending = 0;
+		} else {
+			dev->wd_pending = 1;
+		}
+		dev->wd_stopped = 0;
+		mutex_unlock(&dev->device_lock);
+
+		wait_event_interruptible_timeout(dev->wait_stop_wd,
+				(dev->wd_stopped), 10 * HZ);
+		mutex_lock(&dev->device_lock);
+		if (!dev->wd_stopped)
+			DBG("stop wd failed to complete.\n");
+		else
+			DBG("stop wd complete.\n");
+
+	}
+
+	mei_device = NULL;
+
+	if (dev->iamthif_file_ext.state == MEI_FILE_CONNECTED) {
+		dev->iamthif_file_ext.state = MEI_FILE_DISCONNECTING;
+		mei_disconnect_host_client(dev, &dev->iamthif_file_ext);
+	}
+	if (dev->wd_file_ext.state == MEI_FILE_CONNECTED) {
+		dev->wd_file_ext.state = MEI_FILE_DISCONNECTING;
+		mei_disconnect_host_client(dev, &dev->wd_file_ext);
+	}
+
+	/* remove entry if already in list */
+	DBG("list del iamthif and wd file list.\n");
+	mei_remove_client_from_file_list(dev, dev->wd_file_ext.
+					  host_client_id);
+	mei_remove_client_from_file_list(dev,
+			dev->iamthif_file_ext.host_client_id);
+
+	dev->iamthif_current_cb = NULL;
+	dev->iamthif_file_ext.file = NULL;
+	dev->num_mei_me_clients = 0;
+
+	mutex_unlock(&dev->device_lock);
+
+	flush_scheduled_work();
+
+	/* disable interrupts */
+	mei_csr_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_set_drvdata(pdev, NULL);
+
+	if (dev->mem_addr)
+		iounmap(dev->mem_addr);
+
+	kfree(dev);
+
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+}
+
+/**
+ * mei_clear_list - removes all callbacks associated with file
+ *		from mei_cb_list
+ *
+ * @file: file structure
+ * @mei_cb_list: callbacks list
+ *
+ * mei_clear_list is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * returns true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_list(struct iamt_mei_device *dev,
+		struct file *file, struct list_head *mei_cb_list)
+{
+	struct mei_cb_private *priv_cb_pos = NULL;
+	struct mei_cb_private *priv_cb_next = NULL;
+	struct file *file_temp;
+	bool removed = false;
+
+	/* list all list member */
+	list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
+				 mei_cb_list, cb_list) {
+		file_temp = (struct file *)priv_cb_pos->file_object;
+		/* check if list member associated with a file */
+		if (file_temp == file) {
+			/* remove member from the list */
+			list_del(&priv_cb_pos->cb_list);
+			/* check if cb equal to current iamthif cb */
+			if (dev->iamthif_current_cb == priv_cb_pos) {
+				dev->iamthif_current_cb = NULL;
+				/* send flow control to iamthif client */
+				mei_send_flow_control(dev,
+						       &dev->iamthif_file_ext);
+			}
+			/* free all allocated buffers */
+			mei_free_cb_private(priv_cb_pos);
+			priv_cb_pos = NULL;
+			removed = true;
+		}
+	}
+	return removed;
+}
+
+/**
+ * mei_clear_lists - removes all callbacks associated with file
+ *
+ * @dev: device structure
+ * @file: file structure
+ *
+ * mei_clear_lists is called to clear resources associated with file
+ * when application calls close function or Ctrl-C was pressed
+ *
+ * returns true if callback removed from the list, false otherwise
+ */
+static bool mei_clear_lists(struct iamt_mei_device *dev, struct file *file)
+{
+	bool removed = false;
+
+	/* remove callbacks associated with a file */
+	mei_clear_list(dev, file, &dev->pthi_cmd_list.mei_cb.cb_list);
+	if (mei_clear_list(dev, file,
+			    &dev->pthi_read_complete_list.mei_cb.cb_list))
+		removed = true;
+
+	mei_clear_list(dev, file, &dev->ctrl_rd_list.mei_cb.cb_list);
+
+	if (mei_clear_list(dev, file, &dev->ctrl_wr_list.mei_cb.cb_list))
+		removed = true;
+
+	if (mei_clear_list(dev, file,
+			    &dev->write_waiting_list.mei_cb.cb_list))
+		removed = true;
+
+	if (mei_clear_list(dev, file, &dev->write_list.mei_cb.cb_list))
+		removed = true;
+
+	/* check if iamthif_current_cb not NULL */
+	if (dev->iamthif_current_cb && !removed) {
+		/* check file and iamthif current cb association */
+		if (dev->iamthif_current_cb->file_object == file) {
+			/* remove cb */
+			mei_free_cb_private(dev->iamthif_current_cb);
+			dev->iamthif_current_cb = NULL;
+			removed = true;
+		}
+	}
+	return removed;
+}
+/**
+ * find_read_list_entry - find read list entry
+ *
+ * @dev: device structure
+ * @file: pointer to file structure
+ *
+ * returns cb on success, NULL on error
+ */
+static struct mei_cb_private *find_read_list_entry(
+		struct iamt_mei_device *dev,
+		struct mei_file_private *file_ext)
+{
+	struct mei_cb_private *priv_cb_pos = NULL;
+	struct mei_cb_private *priv_cb_next = NULL;
+	struct mei_file_private *file_ext_list_temp;
+
+	if (dev->read_list.status == 0
+	    && !list_empty(&dev->read_list.mei_cb.cb_list)) {
+		DBG("remove read_list CB\n");
+		list_for_each_entry_safe(priv_cb_pos,
+				priv_cb_next,
+				&dev->read_list.mei_cb.cb_list, cb_list) {
+
+			file_ext_list_temp = (struct mei_file_private *)
+				priv_cb_pos->file_private;
+
+			if ((file_ext_list_temp != NULL) &&
+			    mei_fe_same_id(file_ext, file_ext_list_temp))
+				return priv_cb_pos;
+
+		}
+	}
+	return NULL;
+}
+
+/**
+ * mei_open - the open function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ *
+ * returns 0 on success, <0 on error
+ */
+static int mei_open(struct inode *inode, struct file *file)
+{
+	struct mei_file_private *file_ext;
+	int if_num = iminor(inode), err;
+	struct iamt_mei_device *dev;
+
+	err = -ENODEV;
+	if (!mei_device)
+		goto out;
+
+	dev = pci_get_drvdata(mei_device);
+	if ((if_num != MEI_MINOR_NUMBER) || !dev)
+		goto out;
+
+	mutex_lock(&dev->device_lock);
+	err = -ENOMEM;
+	file_ext = mei_alloc_file_private(file);
+	if (file_ext == NULL)
+		goto out;
+
+	err = -ENODEV;
+	if (dev->mei_state != MEI_ENABLED) {
+		DBG("mei_state != MEI_ENABLED  mei_state= %d\n",
+		    dev->mei_state);
+		goto out_unlock;
+	}
+	err = -EMFILE;
+	if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT)
+		goto out_unlock;
+
+	dev->open_handle_count++;
+	list_add_tail(&file_ext->link, &dev->file_list);
+	while ((dev->mei_host_clients[dev->current_host_client_id / 8]
+		& (1 << (dev->current_host_client_id % 8))) != 0) {
+
+		dev->current_host_client_id++; /* allow overflow */
+		DBG("current_host_client_id = %d\n",
+		    dev->current_host_client_id);
+		DBG("dev->open_handle_count = %lu\n",
+		    dev->open_handle_count);
+	}
+	DBG("current_host_client_id = %d\n", dev->current_host_client_id);
+	file_ext->host_client_id = dev->current_host_client_id;
+	dev->mei_host_clients[file_ext->host_client_id / 8] |=
+		(1 << (file_ext->host_client_id % 8));
+	file_ext->state = MEI_FILE_INITIALIZING;
+	file_ext->sm_state = 0;
+
+	file->private_data = file_ext;
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+
+out_unlock:
+	mutex_unlock(&dev->device_lock);
+	kfree(file_ext);
+out:
+	return err;
+}
+
+/**
+ * mei_release - the release function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ *
+ * returns 0 on success, <0 on error
+ */
+static int mei_release(struct inode *inode, struct file *file)
+{
+	struct mei_file_private *file_ext = file->private_data;
+	struct mei_cb_private *priv_cb;
+	struct iamt_mei_device *dev;
+	int if_num = iminor(inode);
+	int rets = 0;
+
+	if (!mei_device)
+		return -ENODEV;
+
+	dev = pci_get_drvdata(mei_device);
+	if ((if_num != MEI_MINOR_NUMBER) || !dev || !file_ext)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+	if (file_ext != &dev->iamthif_file_ext) {
+		if (file_ext->state == MEI_FILE_CONNECTED) {
+			file_ext->state = MEI_FILE_DISCONNECTING;
+			DBG("disconnecting client host client = %d, "
+			    "ME client = %d\n",
+			    file_ext->host_client_id,
+			    file_ext->me_client_id);
+			rets = mei_disconnect_host_client(dev, file_ext);
+		}
+		mei_flush_queues(dev, file_ext);
+		DBG("remove client host client = %d, ME client = %d\n",
+		    file_ext->host_client_id,
+		    file_ext->me_client_id);
+
+		if (dev->open_handle_count > 0) {
+			dev->mei_host_clients[file_ext->host_client_id / 8] &=
+			~(1 << (file_ext->host_client_id % 8));
+			dev->open_handle_count--;
+		}
+		mei_remove_client_from_file_list(dev,
+						file_ext->host_client_id);
+
+		/* free read cb */
+		priv_cb = NULL;
+		if (file_ext->read_cb != NULL) {
+			priv_cb = find_read_list_entry(dev, file_ext);
+			/* Remove entry from read list */
+			if (priv_cb != NULL)
+				list_del(&priv_cb->cb_list);
+
+			priv_cb = file_ext->read_cb;
+			file_ext->read_cb = NULL;
+		}
+
+		file->private_data = NULL;
+
+		if (priv_cb != NULL) {
+			mei_free_cb_private(priv_cb);
+			priv_cb = NULL;
+		}
+
+		kfree(file_ext);
+	} else {
+		if (dev->open_handle_count > 0)
+			dev->open_handle_count--;
+
+		if (dev->iamthif_file_object == file
+		    && dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+			DBG("pthi canceled iamthif state %d\n",
+			    dev->iamthif_state);
+			dev->iamthif_canceled = 1;
+			if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
+				DBG("run next pthi iamthif cb\n");
+				run_next_iamthif_cmd(dev);
+			}
+		}
+
+		if (mei_clear_lists(dev, file))
+			dev->iamthif_state = MEI_IAMTHIF_IDLE;
+
+	}
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+
+/**
+ * mei_read - the read function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * returns >=0 data length on success , <0 on error
+ */
+static ssize_t mei_read(struct file *file, char __user *ubuf,
+			 size_t length, loff_t *offset)
+{
+	int i;
+	int rets = 0, err = 0;
+	int if_num = iminor(file->f_dentry->d_inode);
+	struct mei_file_private *file_ext = file->private_data;
+	struct mei_cb_private *priv_cb_pos = NULL;
+	struct mei_cb_private *priv_cb = NULL;
+	struct iamt_mei_device *dev;
+
+	if (!mei_device)
+		return -ENODEV;
+
+	dev = pci_get_drvdata(mei_device);
+	if ((if_num != MEI_MINOR_NUMBER) || (!dev) || (!file_ext))
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+	if (dev->mei_state != MEI_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	if ((file_ext->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
+		/* Do not allow to read watchdog client */
+		for (i = 0; i < dev->num_mei_me_clients; i++) {
+			struct mei_me_client *me_client = &dev->me_clients[i];
+			if ((memcmp(&mei_wd_guid,
+					&me_client->props.protocol_name,
+					sizeof(struct guid)) == 0) &&
+			    (file_ext->me_client_id == me_client->client_id)) {
+				rets = -EBADF;
+				goto out;
+			}
+
+		}
+	} else {
+		file_ext->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+	}
+
+	if (file_ext == &dev->iamthif_file_ext) {
+		rets = pthi_read(dev, if_num, file, ubuf, length, offset);
+		goto out;
+	}
+
+	if (file_ext->read_cb && file_ext->read_cb->information > *offset) {
+		priv_cb = file_ext->read_cb;
+		goto copy_buffer;
+	} else if (file_ext->read_cb && file_ext->read_cb->information > 0 &&
+		   file_ext->read_cb->information <= *offset) {
+		priv_cb = file_ext->read_cb;
+		rets = 0;
+		goto free;
+	} else if ((!file_ext->read_cb || file_ext->read_cb->information == 0)
+		    && *offset > 0) {
+		/*Offset needs to be cleaned for contingous reads*/
+		*offset = 0;
+		rets = 0;
+		goto out;
+	}
+
+	err = mei_start_read(dev, if_num, file_ext);
+	if (err != 0 && err != -EBUSY) {
+		DBG("mei start read failure with status = %d\n", err);
+		rets = err;
+		goto out;
+	}
+
+	if (MEI_READ_COMPLETE != file_ext->reading_state
+			&& !waitqueue_active(&file_ext->rx_wait)) {
+		if (file->f_flags & O_NONBLOCK) {
+			rets = -EAGAIN;
+			goto out;
+		}
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(file_ext->rx_wait,
+			(MEI_READ_COMPLETE == file_ext->reading_state
+			 || MEI_FILE_INITIALIZING == file_ext->state
+			 || MEI_FILE_DISCONNECTED == file_ext->state
+			 || MEI_FILE_DISCONNECTING == file_ext->state))) {
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+		if (MEI_FILE_INITIALIZING == file_ext->state ||
+		    MEI_FILE_DISCONNECTED == file_ext->state ||
+		    MEI_FILE_DISCONNECTING == file_ext->state) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
+
+	priv_cb = file_ext->read_cb;
+
+	if (!priv_cb) {
+		rets = -ENODEV;
+		goto out;
+	}
+	if (file_ext->reading_state != MEI_READ_COMPLETE) {
+		rets = 0;
+		goto out;
+	}
+	/* now copy the data to user space */
+copy_buffer:
+	DBG("priv_cb->response_buffer size - %d\n",
+	    priv_cb->response_buffer.size);
+	DBG("priv_cb->information - %lu\n",
+	    priv_cb->information);
+	if (length == 0 || ubuf == NULL ||
+	    *offset > priv_cb->information) {
+		rets = -EMSGSIZE;
+		goto free;
+	}
+
+	/* length is being turncated to PAGE_SIZE, however, */
+	/* information size may be longer */
+	length = (length < (priv_cb->information - *offset) ?
+			length : (priv_cb->information - *offset));
+
+	if (copy_to_user(ubuf,
+			 priv_cb->response_buffer.data + *offset,
+			 length)) {
+		rets = -EFAULT;
+		goto free;
+	}
+
+	rets = length;
+	*offset += length;
+	if ((unsigned long)*offset < priv_cb->information)
+		goto out;
+
+free:
+	priv_cb_pos = find_read_list_entry(dev, file_ext);
+	/* Remove entry from read list */
+	if (priv_cb_pos != NULL)
+		list_del(&priv_cb_pos->cb_list);
+	mei_free_cb_private(priv_cb);
+	file_ext->reading_state = MEI_IDLE;
+	file_ext->read_cb = NULL;
+	file_ext->read_pending = 0;
+out:
+	DBG("end mei read rets= %d\n", rets);
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+/**
+ * mei_write - the write function.
+ *
+ * @file: pointer to file structure
+ * @ubuf: pointer to user buffer
+ * @length: buffer length
+ * @offset: data offset in buffer
+ *
+ * returns >=0 data length on success , <0 on error
+ */
+static ssize_t mei_write(struct file *file, const char __user *ubuf,
+			  size_t length, loff_t *offset)
+{
+	struct mei_file_private *file_ext = file->private_data;
+	struct mei_cb_private *priv_write_cb = NULL;
+	struct mei_msg_hdr mei_hdr;
+	struct iamt_mei_device *dev;
+	unsigned long currtime = get_seconds();
+	int if_num = iminor(file->f_dentry->d_inode);
+	int rets;
+	u8 i;
+
+	if (!mei_device)
+		return -ENODEV;
+
+	dev = pci_get_drvdata(mei_device);
+
+	if ((if_num != MEI_MINOR_NUMBER) || !dev || !file_ext)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->mei_state != MEI_ENABLED) {
+		mutex_unlock(&dev->device_lock);
+		return -ENODEV;
+	}
+	if (file_ext == &dev->iamthif_file_ext) {
+		priv_write_cb = find_pthi_read_list_entry(dev, file);
+		if ((priv_write_cb != NULL) &&
+		     (((currtime - priv_write_cb->read_time) >=
+			    IAMTHIF_READ_TIMER) ||
+		      (file_ext->reading_state == MEI_READ_COMPLETE))) {
+			*offset = 0;
+			list_del(&priv_write_cb->cb_list);
+			mei_free_cb_private(priv_write_cb);
+			priv_write_cb = NULL;
+		}
+	}
+
+	/* free entry used in read */
+	if (file_ext->reading_state == MEI_READ_COMPLETE) {
+		*offset = 0;
+		priv_write_cb = find_read_list_entry(dev, file_ext);
+		if (priv_write_cb != NULL) {
+			list_del(&priv_write_cb->cb_list);
+			mei_free_cb_private(priv_write_cb);
+			priv_write_cb = NULL;
+			file_ext->reading_state = MEI_IDLE;
+			file_ext->read_cb = NULL;
+			file_ext->read_pending = 0;
+		}
+	} else if (file_ext->reading_state == MEI_IDLE &&
+			file_ext->read_pending == 0)
+		*offset = 0;
+
+
+	priv_write_cb = kzalloc(sizeof(struct mei_cb_private), GFP_KERNEL);
+	if (!priv_write_cb) {
+		mutex_unlock(&dev->device_lock);
+		return -ENOMEM;
+	}
+
+	priv_write_cb->file_object = file;
+	priv_write_cb->file_private = file_ext;
+	priv_write_cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
+	rets = -ENOMEM;
+	if (!priv_write_cb->request_buffer.data)
+		goto unlock_dev;
+
+	DBG("length =%d\n", (int) length);
+
+	rets = -EFAULT;
+	if (copy_from_user(priv_write_cb->request_buffer.data, ubuf, length))
+		goto unlock_dev;
+
+	file_ext->sm_state = 0;
+	if ((length == 4) &&
+	    ((memcmp(mei_wd_state_independence_msg[0],
+				 priv_write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[1],
+				 priv_write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[2],
+				 priv_write_cb->request_buffer.data, 4) == 0)))
+		file_ext->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+
+	INIT_LIST_HEAD(&priv_write_cb->cb_list);
+	if (file_ext == &dev->iamthif_file_ext) {
+		priv_write_cb->response_buffer.data =
+		    kmalloc(dev->iamthif_mtu, GFP_KERNEL);
+		if (!priv_write_cb->response_buffer.data) {
+			rets = -ENOMEM;
+			goto unlock_dev;
+		}
+		if (dev->mei_state != MEI_ENABLED) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+		for (i = 0; i < dev->num_mei_me_clients; i++) {
+			if (dev->me_clients[i].client_id ==
+				dev->iamthif_file_ext.me_client_id)
+				break;
+		}
+
+		BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
+		if ((i == dev->num_mei_me_clients) ||
+		    (dev->me_clients[i].client_id !=
+		      dev->iamthif_file_ext.me_client_id)) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		} else if ((length > dev->me_clients[i].props.max_msg_length)
+			    || (length <= 0)) {
+			rets = -EMSGSIZE;
+			goto unlock_dev;
+		}
+
+		priv_write_cb->response_buffer.size = dev->iamthif_mtu;
+		priv_write_cb->major_file_operations = MEI_IOCTL;
+		priv_write_cb->information = 0;
+		priv_write_cb->request_buffer.size = length;
+		if (dev->iamthif_file_ext.state != MEI_FILE_CONNECTED) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+
+		if (!list_empty(&dev->pthi_cmd_list.mei_cb.cb_list)
+				|| dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+			DBG("pthi_state = %d\n", (int) dev->iamthif_state);
+			DBG("add PTHI cb to pthi cmd waiting list\n");
+			list_add_tail(&priv_write_cb->cb_list,
+					&dev->pthi_cmd_list.mei_cb.cb_list);
+			rets = length;
+		} else {
+			DBG("call pthi write\n");
+			rets = pthi_write(dev, priv_write_cb);
+
+			if (rets != 0) {
+				DBG("pthi write failed with status = %d\n",
+				    rets);
+				goto unlock_dev;
+			}
+			rets = length;
+		}
+		mutex_unlock(&dev->device_lock);
+		return rets;
+	}
+
+	priv_write_cb->major_file_operations = MEI_WRITE;
+	/* make sure information is zero before we start */
+
+	priv_write_cb->information = 0;
+	priv_write_cb->request_buffer.size = length;
+
+	DBG("host client = %d, ME client = %d\n",
+	    file_ext->host_client_id, file_ext->me_client_id);
+	if (file_ext->state != MEI_FILE_CONNECTED) {
+		rets = -ENODEV;
+		DBG("host client = %d,  is not connected to ME client = %d",
+		    file_ext->host_client_id,
+		    file_ext->me_client_id);
+		goto unlock_dev;
+	}
+	for (i = 0; i < dev->num_mei_me_clients; i++) {
+		if (dev->me_clients[i].client_id ==
+		    file_ext->me_client_id)
+			break;
+	}
+	BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
+	if (i == dev->num_mei_me_clients) {
+		rets = -ENODEV;
+		goto unlock_dev;
+	}
+	if (length > dev->me_clients[i].props.max_msg_length || length <= 0) {
+		rets = -EINVAL;
+		goto unlock_dev;
+	}
+	priv_write_cb->file_private = file_ext;
+
+	if (flow_ctrl_creds(dev, file_ext) &&
+		dev->host_buffer_is_empty) {
+		dev->host_buffer_is_empty = 0;
+		if (length > ((((dev->host_hw_state & H_CBD) >> 24) *
+			sizeof(u32)) -sizeof(struct mei_msg_hdr))) {
+
+			mei_hdr.length =
+				(((dev->host_hw_state & H_CBD) >> 24) *
+				sizeof(u32)) -
+				sizeof(struct mei_msg_hdr);
+			mei_hdr.msg_complete = 0;
+		} else {
+			mei_hdr.length = length;
+			mei_hdr.msg_complete = 1;
+		}
+		mei_hdr.host_addr = file_ext->host_client_id;
+		mei_hdr.me_addr = file_ext->me_client_id;
+		mei_hdr.reserved = 0;
+		DBG("call mei_write_message header=%08x.\n",
+		    *((u32 *) &mei_hdr));
+		if (!mei_write_message(dev, &mei_hdr,
+			(unsigned char *) (priv_write_cb->request_buffer.data),
+			mei_hdr.length)) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+		file_ext->writing_state = MEI_WRITING;
+		priv_write_cb->information = mei_hdr.length;
+		if (mei_hdr.msg_complete) {
+			flow_ctrl_reduce(dev, file_ext);
+			list_add_tail(&priv_write_cb->cb_list,
+				      &dev->write_waiting_list.mei_cb.cb_list);
+		} else {
+			list_add_tail(&priv_write_cb->cb_list,
+				      &dev->write_list.mei_cb.cb_list);
+		}
+
+	} else {
+
+		priv_write_cb->information = 0;
+		file_ext->writing_state = MEI_WRITING;
+		list_add_tail(&priv_write_cb->cb_list,
+			      &dev->write_list.mei_cb.cb_list);
+	}
+	mutex_unlock(&dev->device_lock);
+	return length;
+
+unlock_dev:
+	mutex_unlock(&dev->device_lock);
+	mei_free_cb_private(priv_write_cb);
+	return rets;
+}
+
+/**
+ * mei_ioctl - the IOCTL function
+ *
+ * @inode: pointer to inode structure
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * returns 0 on success , <0 on error
+ */
+static long mei_ioctl(struct file *file,
+		      unsigned int cmd, unsigned long data)
+{
+	struct inode *inode;
+	struct mei_file_private *file_ext = file->private_data;
+	int rets = 0;
+	int if_num;
+
+	/* in user space */
+	struct mei_message_data __user *u_msg;
+	struct mei_message_data k_msg;	/* all in kernel on the stack */
+	struct iamt_mei_device *dev;
+
+	/* Fix in order to use unlocked_ioctl for suppoer kernel >= 2.6.36 */
+	inode = file->f_dentry->d_inode;
+	if_num = iminor(inode);
+
+	if (!mei_device)
+		return -ENODEV;
+
+	dev = pci_get_drvdata(mei_device);
+	if ((if_num != MEI_MINOR_NUMBER) || !dev || !file_ext)
+		return -ENODEV;
+
+	mutex_lock(&dev->device_lock);
+	if (dev->mei_state != MEI_ENABLED) {
+		mutex_unlock(&dev->device_lock);
+		return -ENODEV;
+	}
+
+	/* first copy from user all data needed */
+	u_msg = (struct mei_message_data __user *)data;
+	if (copy_from_user(&k_msg, u_msg, sizeof(k_msg))) {
+		DBG("first copy from user all data needed filled\n");
+		mutex_unlock(&dev->device_lock);
+		return -EFAULT;
+	}
+	DBG("user message size is %d\n", k_msg.size);
+
+	switch (cmd) {
+	case IOCTL_MEI_GET_VERSION:
+		DBG(": IOCTL_MEI_GET_VERSION\n");
+		rets = mei_ioctl_get_version(dev, if_num, u_msg, k_msg,
+					      file_ext);
+		break;
+
+	case IOCTL_MEI_CONNECT_CLIENT:
+		DBG(": IOCTL_MEI_CONNECT_CLIENT.\n");
+		rets = mei_ioctl_connect_client(dev, if_num, u_msg, k_msg,
+						 file);
+		break;
+
+	case IOCTL_MEI_WD:
+		DBG(": IOCTL_MEI_WD.\n");
+		rets = mei_ioctl_wd(dev, if_num, k_msg, file_ext);
+		break;
+
+	case IOCTL_MEI_BYPASS_WD:
+		DBG(": IOCTL_MEI_BYPASS_WD.\n");
+		rets = mei_ioctl_bypass_wd(dev, if_num, k_msg, file_ext);
+		break;
+
+	default:
+		rets = -EINVAL;
+		break;
+	}
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+/**
+ * mei_poll - the poll function
+ *
+ * @file: pointer to file structure
+ * @wait: pointer to poll_table structure
+ *
+ * returns poll mask
+ */
+static unsigned int mei_poll(struct file *file, poll_table *wait)
+{
+	int if_num = iminor(file->f_dentry->d_inode);
+	unsigned int mask = 0;
+	struct mei_file_private *file_ext = file->private_data;
+	struct iamt_mei_device *dev;
+
+	if (!mei_device)
+		return mask;
+
+	dev = pci_get_drvdata(mei_device);
+
+	if ((if_num != MEI_MINOR_NUMBER) || !dev || !file_ext)
+		return mask;
+
+	mutex_lock(&dev->device_lock);
+	if (dev->mei_state != MEI_ENABLED) {
+		mutex_unlock(&dev->device_lock);
+		return mask;
+	}
+
+	if (file_ext == &dev->iamthif_file_ext) {
+		mutex_unlock(&dev->device_lock);
+		poll_wait(file, &dev->iamthif_file_ext.wait, wait);
+		mutex_lock(&dev->device_lock);
+		if ((dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE)
+		    && dev->iamthif_file_object == file) {
+			mask |= (POLLIN | POLLRDNORM);
+			DBG("run next pthi cb\n");
+			run_next_iamthif_cmd(dev);
+		}
+
+	} else {
+		mutex_unlock(&dev->device_lock);
+		poll_wait(file, &file_ext->tx_wait, wait);
+		mutex_lock(&dev->device_lock);
+		if (MEI_WRITE_COMPLETE == file_ext->writing_state)
+			mask |= (POLLIN | POLLRDNORM);
+
+	}
+	mutex_unlock(&dev->device_lock);
+	return mask;
+}
+
+#ifdef CONFIG_PM
+static int mei_pci_suspend(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct iamt_mei_device *dev = pci_get_drvdata(pdev);
+	int err = 0;
+
+	if (!dev)
+		return -ENODEV;
+	mutex_lock(&dev->device_lock);
+	/* Stop watchdog if exists */
+	cancel_delayed_work(&dev->wd_work);
+	if ((dev->wd_file_ext.state == MEI_FILE_CONNECTED) && dev->wd_timeout) {
+		g_sus_wd_timeout = dev->wd_timeout;
+		dev->wd_timeout = 0;
+		dev->wd_due_counter = 0;
+		memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
+		dev->stop = 1;
+		if (dev->host_buffer_is_empty &&
+		    flow_ctrl_creds(dev, &dev->wd_file_ext)) {
+			dev->host_buffer_is_empty = 0;
+			if (!mei_send_wd(dev))
+				DBG("send stop WD failed\n");
+			else
+				flow_ctrl_reduce(dev, &dev->wd_file_ext);
+
+			dev->wd_pending = 0;
+		} else {
+			dev->wd_pending = 1;
+		}
+		dev->wd_stopped = 0;
+
+		mutex_unlock(&dev->device_lock);
+		err = wait_event_interruptible_timeout(dev->wait_stop_wd,
+						       (dev->wd_stopped),
+						       10 * HZ);
+		mutex_lock(&dev->device_lock);
+		if (!dev->wd_stopped)
+			DBG("stop wd failed to complete.\n");
+		else {
+			DBG("stop wd complete %d.\n", err);
+			err = 0;
+		}
+	}
+	/* Set new mei state */
+	if ((dev->mei_state == MEI_ENABLED) ||
+	    (dev->mei_state == MEI_RECOVERING_FROM_RESET)) {
+		dev->mei_state = MEI_POWER_DOWN;
+		mei_reset(dev, 0);
+	}
+	mutex_unlock(&dev->device_lock);
+
+	free_irq(pdev->irq, dev);
+
+
+	return err;
+}
+
+static int mei_pci_resume(struct device *device)
+{
+	struct pci_dev *pdev = to_pci_dev(device);
+	struct iamt_mei_device *dev;
+	int err;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return -ENODEV;
+
+	/* request and enable interrupt   */
+	err = request_threaded_irq(pdev->irq,
+			mei_interrupt_quick_handler,
+			mei_interrupt_thread_handler,
+			IRQF_SHARED, mei_driver_name, dev);
+	if (err) {
+		printk(KERN_ERR "mei: Request_irq failure. irq = %d\n",
+		       pdev->irq);
+		return err;
+	}
+
+	mutex_lock(&dev->device_lock);
+	dev->mei_state = MEI_POWER_UP;
+	mei_reset(dev, 1);
+	mutex_unlock(&dev->device_lock);
+
+	/* Start watchdog if stopped in suspend */
+	if (g_sus_wd_timeout != 0) {
+		dev->wd_timeout = g_sus_wd_timeout;
+
+		memcpy(dev->wd_data, mei_start_wd_params,
+			MEI_WD_PARAMS_SIZE);
+		memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE,
+			&dev->wd_timeout, sizeof(u16));
+		dev->wd_due_counter = 1;
+
+		if (dev->wd_timeout)
+			schedule_delayed_work(&dev->wd_work, HZ);
+
+		g_sus_wd_timeout = 0;
+	}
+	return err;
+}
+static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
+#define MEI_PM_OPS	(&mei_pm_ops)
+#else
+#define MIE_PM_OPS	NULL
+#endif /* CONFIG_PM */
+/*
+ *  PCI driver structure
+ */
+static struct pci_driver mei_driver = {
+	.name = mei_driver_name,
+	.id_table = mei_pci_tbl,
+	.probe = mei_probe,
+	.remove = __devexit_p(mei_remove),
+	.shutdown = __devexit_p(mei_remove),
+	.driver.pm = MEI_PM_OPS,
+};
+
+/*
+ * file operations structure will be used for mei char device.
+ */
+static const struct file_operations mei_fops = {
+	.owner = THIS_MODULE,
+	.read = mei_read,
+	.unlocked_ioctl = mei_ioctl,
+	.open = mei_open,
+	.release = mei_release,
+	.write = mei_write,
+	.poll = mei_poll,
+};
+
+/**
+ * mei_registration_cdev - sets up the cdev structure for mei device.
+ *
+ * @dev: char device struct
+ * @hminor: minor number for registration char device
+ * @fops: file operations structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_registration_cdev(struct cdev *dev, int hminor,
+				  const struct file_operations *fops)
+{
+	int ret, devno = MKDEV(mei_major, hminor);
+
+	cdev_init(dev, fops);
+	dev->owner = THIS_MODULE;
+	ret = cdev_add(dev, devno, 1);
+	/* Fail gracefully if need be */
+	if (ret)
+		printk(KERN_ERR "mei: Error %d registering mei device %d\n",
+		       ret, hminor);
+	return ret;
+}
+
+static ssize_t version_show(struct class *class,
+			    struct class_attribute *attr,
+			    char *buf)
+{
+	return sprintf(buf, "%s %s.\n", mei_driver_string, mei_driver_version);
+}
+
+static CLASS_ATTR(version, S_IRUGO, version_show, NULL);
+
+/**
+ * mei_register_cdev - registers mei char device
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_register_cdev(void)
+{
+	int ret;
+	dev_t dev;
+
+	/* registration of char devices */
+	ret = alloc_chrdev_region(&dev, MEI_MINORS_BASE, MEI_MINORS_COUNT,
+				  MEI_DRIVER_NAME);
+	if (ret) {
+		printk(KERN_ERR "mei: Error allocating char device region.\n");
+		return ret;
+	}
+
+	mei_major = MAJOR(dev);
+
+	ret = mei_registration_cdev(&mei_cdev, MEI_MINOR_NUMBER,
+				     &mei_fops);
+	if (ret)
+		unregister_chrdev_region(MKDEV(mei_major, MEI_MINORS_BASE),
+					 MEI_MINORS_COUNT);
+
+	return ret;
+}
+
+/**
+ * mei_unregister_cdev - unregisters mei char device
+ */
+static void mei_unregister_cdev(void)
+{
+	cdev_del(&mei_cdev);
+	unregister_chrdev_region(MKDEV(mei_major, MEI_MINORS_BASE),
+				 MEI_MINORS_COUNT);
+}
+
+#ifndef MEI_DEVICE_CREATE
+#define MEI_DEVICE_CREATE device_create
+#endif
+/**
+ * mei_sysfs_device_create - adds device entry to sysfs
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int mei_sysfs_device_create(void)
+{
+	struct class *class;
+	void *tmphdev;
+	int err;
+
+	class = class_create(THIS_MODULE, MEI_DRIVER_NAME);
+	if (IS_ERR(class)) {
+		err = PTR_ERR(class);
+		printk(KERN_ERR "mei: Error creating mei class.\n");
+		goto err_out;
+	}
+
+	err = class_create_file(class, &class_attr_version);
+	if (err) {
+		printk(KERN_ERR "mei: Error creating mei class file.\n");
+		goto err_destroy;
+	}
+
+	tmphdev = MEI_DEVICE_CREATE(class, NULL, mei_cdev.dev, NULL,
+					MEI_DEV_NAME);
+	if (IS_ERR(tmphdev)) {
+		err = PTR_ERR(tmphdev);
+		goto err_remove;
+	}
+
+	mei_class = class;
+	return 0;
+
+err_remove:
+	class_remove_file(class, &class_attr_version);
+err_destroy:
+	class_destroy(class);
+err_out:
+	return err;
+}
+
+/**
+ * mei_sysfs_device_remove - unregisters the device entry on sysfs
+ */
+static void mei_sysfs_device_remove(void)
+{
+	if ((mei_class == NULL) || (IS_ERR(mei_class)))
+		return;
+
+	device_destroy(mei_class, mei_cdev.dev);
+	class_remove_file(mei_class, &class_attr_version);
+	class_destroy(mei_class);
+}
+
+/**
+ * mei_init_module - Driver Registration Routine
+ *
+ * mei_init_module is the first routine called when the driver is
+ * loaded. All it does is to register with the PCI subsystem.
+ *
+ * returns 0 on success, <0 on failure.
+ */
+static int __init mei_init_module(void)
+{
+	int ret;
+
+	printk(KERN_INFO "mei: %s - version %s\n", mei_driver_string,
+			mei_driver_version);
+	/* init pci module */
+	ret = pci_register_driver(&mei_driver);
+	if (ret < 0) {
+		printk(KERN_ERR "mei: Error registering driver.\n");
+		goto end;
+	}
+
+	ret = mei_register_cdev();
+	if (ret)
+		goto unregister_pci;
+
+	ret = mei_sysfs_device_create();
+	if (ret)
+		goto unregister_cdev;
+
+	return ret;
+
+unregister_cdev:
+	mei_unregister_cdev();
+unregister_pci:
+	pci_unregister_driver(&mei_driver);
+end:
+	return ret;
+}
+
+module_init(mei_init_module);
+
+/**
+ * mei_exit_module - Driver Exit Cleanup Routine
+ *
+ * mei_exit_module is called just before the driver is removed
+ * from memory.
+ */
+static void __exit mei_exit_module(void)
+{
+	pci_unregister_driver(&mei_driver);
+	mei_sysfs_device_remove();
+	mei_unregister_cdev();
+
+	printk(KERN_INFO "mei: Driver unloaded successfully.\n");
+}
+
+module_exit(mei_exit_module);
+
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(MEI_DRIVER_VERSION);


---------------------------------------------------------------------
Intel Israel (74) Limited

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