staging/mei: PCI device and char driver support.

contains module entries and PCI driver and char device
definitions (using file_operations, pci_driver struts).

The HW interface is exposed on PCI interface.
PCI:
	The MEI HW resources are memory map 32 bit registers
	(Host and ME Status Registers and Data Registers)
	and interrupt (shared, with Intel GFX on some chipsets
	and USB2 controller on others).
	The device is part of the chipsets and cannot be hotplugged.
	The MEI device present is determined by BIOS configuration.

Probe:
	The driver starts the init MEI flow, that is explained
	in the patch "MEI driver init flow" [06/10],
	then schedules a timer that handles
	timeouts and watchdog heartbeats.

Remove:
	The driver closes all connections and stops the watchdog.

The driver expose char device that supports:
	open, release, write, read, ioctl, poll.

Open:
	Upon open the driver allocates HOST data structure
	on behalf of application which will resides in the file's
	private data and assign a host ID number which
	will identify messages between driver client instance
	and MEI client.

	The driver also checks readiness of the device. The number
	of simultaneously opened instances is limited to 253.
	(255 - (amthi + watchdog))

Release:
	In release the driver sends a Disconnect Command to
	ME feature and clean all the data structs.

IOCTL:
	MEI adds new IOCTL: (IOCTL_MEI_CONNECT_CLIENT)
	The IOCTL links the current file descriptor to ME feature.
	This is done by sending MEI Bus command: 'hbm_client_connect_request'
	to the ME and waiting for an answer :'hbm_client_connect_response'.
	Upon answer reception the driver updates its and HOST data
	structures in file structure to indicate that the file
	descriptor is associated to ME feature.

	Each ME feature is represented by UUID which is given as
	an input parameter to the IOCTL, upon success connect command the
	IOCTL will return the ME feature properties.
	ME can reject CONNECT commands due to several reasons,
	most common are:
		Invalid UUID ME or feature does not exists in ME.
		No More Connection allowed to this is feature,
		usually only one connection is allowed.

Write:
	Upon write, the driver splits the user data into several MEI
	messages up to 512 bytes each and sends it to the HW.
	If the user wants to write data to AMTHI ME feature then the
	drivers routes the messages through AMTHI queues.

Read:
	In read the driver checks is a connection exists to
	current file descriptor and then wait until a data is available.
	Message might be received (by interrupt from ME) in multiple chunks.
	Only complete message is released to the application.
Poll:
	Nothing special here. Waiting for see if we have
	data available for reading.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Itzhak Tzeel-Krupp <itzhak.tzeel-krupp@intel.com>
Signed-off-by: Oren Weil <oren.jer.weil@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1349 insertions, 0 deletions

diff --git a/drivers/staging/mei/main.c b/drivers/staging/mei/main.c
new file mode 100644
index 0000000..16ae1a8
--- /dev/null
+++ b/drivers/staging/mei/main.c
@@ -0,0 +1,1349 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel 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.
+ *
+ */
+
+
+
+#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 <linux/uuid.h>
+#include <linux/compat.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+
+#include "mei_dev.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;
+
+/* 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)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
+
+	/* required last entry */
+	{0, }
+};
+
+MODULE_DEVICE_TABLE(pci, mei_pci_tbl);
+
+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 mei_device *dev;
+	int 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 */
+	dev->mem_addr = pci_iomap(pdev, 0, 0);
+	if (!dev->mem_addr) {
+		printk(KERN_ERR "mei: mapping I/O 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);
+
+	mutex_unlock(&mei_mutex);
+
+	pr_debug("mei: Driver initialization successful.\n");
+
+	return 0;
+
+release_irq:
+	/* disable interrupts */
+	dev->host_hw_state = mei_hcsr_read(dev);
+	mei_disable_interrupts(dev);
+	flush_scheduled_work();
+	free_irq(pdev->irq, dev);
+unmap_memory:
+	pci_iounmap(pdev, 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 mei_device *dev;
+
+	if (mei_device != pdev)
+		return;
+
+	dev = pci_get_drvdata(pdev);
+	if (!dev)
+		return;
+
+	mutex_lock(&dev->device_lock);
+
+	mei_wd_stop(dev, false);
+
+	mei_device = NULL;
+
+	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
+		dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
+		mei_disconnect_host_client(dev, &dev->iamthif_cl);
+	}
+	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
+		dev->wd_cl.state = MEI_FILE_DISCONNECTING;
+		mei_disconnect_host_client(dev, &dev->wd_cl);
+	}
+
+	/* remove entry if already in list */
+	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");
+	mei_remove_client_from_file_list(dev, dev->wd_cl.host_client_id);
+	mei_remove_client_from_file_list(dev, dev->iamthif_cl.host_client_id);
+
+	dev->iamthif_current_cb = NULL;
+	dev->num_mei_me_clients = 0;
+
+	mutex_unlock(&dev->device_lock);
+
+	flush_scheduled_work();
+
+	/* disable interrupts */
+	mei_disable_interrupts(dev);
+
+	free_irq(pdev->irq, dev);
+	pci_set_drvdata(pdev, NULL);
+
+	if (dev->mem_addr)
+		pci_iounmap(pdev, 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
+ *
+ * @dev: device structure.
+ * @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 mei_device *dev,
+		struct file *file, struct list_head *mei_cb_list)
+{
+	struct mei_cl_cb *cb_pos = NULL;
+	struct mei_cl_cb *cb_next = NULL;
+	struct file *file_temp;
+	bool removed = false;
+
+	/* list all list member */
+	list_for_each_entry_safe(cb_pos, cb_next, mei_cb_list, cb_list) {
+		file_temp = (struct file *)cb_pos->file_object;
+		/* check if list member associated with a file */
+		if (file_temp == file) {
+			/* remove member from the list */
+			list_del(&cb_pos->cb_list);
+			/* check if cb equal to current iamthif cb */
+			if (dev->iamthif_current_cb == cb_pos) {
+				dev->iamthif_current_cb = NULL;
+				/* send flow control to iamthif client */
+				mei_send_flow_control(dev, &dev->iamthif_cl);
+			}
+			/* free all allocated buffers */
+			mei_free_cb_private(cb_pos);
+			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 mei_device *dev, struct file *file)
+{
+	bool removed = false;
+
+	/* remove callbacks associated with a file */
+	mei_clear_list(dev, file, &dev->amthi_cmd_list.mei_cb.cb_list);
+	if (mei_clear_list(dev, file,
+			    &dev->amthi_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_cl_cb *find_read_list_entry(
+		struct mei_device *dev,
+		struct mei_cl *cl)
+{
+	struct mei_cl_cb *cb_pos = NULL;
+	struct mei_cl_cb *cb_next = NULL;
+	struct mei_cl *cl_list_temp;
+
+	if (!dev->read_list.status &&
+	    !list_empty(&dev->read_list.mei_cb.cb_list)) {
+
+		dev_dbg(&dev->pdev->dev, "remove read_list CB\n");
+		list_for_each_entry_safe(cb_pos, cb_next,
+				&dev->read_list.mei_cb.cb_list, cb_list) {
+
+			cl_list_temp = (struct mei_cl *)
+				cb_pos->file_private;
+
+			if (cl_list_temp &&
+			    mei_fe_same_id(cl, cl_list_temp))
+				return 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_cl *cl;
+	int if_num = iminor(inode), err;
+	struct 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;
+	cl = mei_alloc_file_private(dev);
+	if (!cl)
+		goto out;
+
+	err = -ENODEV;
+	if (dev->mei_state != MEI_ENABLED) {
+		dev_dbg(&dev->pdev->dev, "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;
+
+	cl->host_client_id = find_first_zero_bit(dev->host_clients_map,
+							MEI_CLIENTS_MAX);
+	if (cl->host_client_id > MEI_CLIENTS_MAX)
+		goto out_unlock;
+
+	dev_dbg(&dev->pdev->dev, "client_id = %d\n", cl->host_client_id);
+
+	dev->open_handle_count++;
+	list_add_tail(&cl->link, &dev->file_list);
+
+	set_bit(cl->host_client_id, dev->host_clients_map);
+	cl->state = MEI_FILE_INITIALIZING;
+	cl->sm_state = 0;
+
+	file->private_data = cl;
+	mutex_unlock(&dev->device_lock);
+
+	return 0;
+
+out_unlock:
+	mutex_unlock(&dev->device_lock);
+	kfree(cl);
+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_cl *cl = file->private_data;
+	struct mei_cl_cb *cb;
+	struct mei_device *dev;
+	int rets = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (cl != &dev->iamthif_cl) {
+		if (cl->state == MEI_FILE_CONNECTED) {
+			cl->state = MEI_FILE_DISCONNECTING;
+			dev_dbg(&dev->pdev->dev,
+				"disconnecting client host client = %d, "
+			    "ME client = %d\n",
+			    cl->host_client_id,
+			    cl->me_client_id);
+			rets = mei_disconnect_host_client(dev, cl);
+		}
+		mei_flush_queues(dev, cl);
+		dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n",
+		    cl->host_client_id,
+		    cl->me_client_id);
+
+		if (dev->open_handle_count > 0) {
+			clear_bit(cl->host_client_id,
+				  dev->host_clients_map);
+			dev->open_handle_count--;
+		}
+		mei_remove_client_from_file_list(dev, cl->host_client_id);
+
+		/* free read cb */
+		cb = NULL;
+		if (cl->read_cb) {
+			cb = find_read_list_entry(dev, cl);
+			/* Remove entry from read list */
+			if (cb)
+				list_del(&cb->cb_list);
+
+			cb = cl->read_cb;
+			cl->read_cb = NULL;
+		}
+
+		file->private_data = NULL;
+
+		if (cb) {
+			mei_free_cb_private(cb);
+			cb = NULL;
+		}
+
+		kfree(cl);
+	} else {
+		if (dev->open_handle_count > 0)
+			dev->open_handle_count--;
+
+		if (dev->iamthif_file_object == file &&
+		    dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+
+			dev_dbg(&dev->pdev->dev, "amthi canceled iamthif state %d\n",
+			    dev->iamthif_state);
+			dev->iamthif_canceled = 1;
+			if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
+				dev_dbg(&dev->pdev->dev, "run next amthi 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)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_cl_cb *cb_pos = NULL;
+	struct mei_cl_cb *cb = NULL;
+	struct mei_device *dev;
+	int i;
+	int rets;
+	int err;
+
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+	if (dev->mei_state != MEI_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	if ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
+		/* Do not allow to read watchdog client */
+		i = mei_find_me_client_index(dev, mei_wd_guid);
+		if (i >= 0) {
+			struct mei_me_client *me_client = &dev->me_clients[i];
+
+			if (cl->me_client_id == me_client->client_id) {
+				rets = -EBADF;
+				goto out;
+			}
+		}
+	} else {
+		cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		rets = amthi_read(dev, file, ubuf, length, offset);
+		goto out;
+	}
+
+	if (cl->read_cb && cl->read_cb->information > *offset) {
+		cb = cl->read_cb;
+		goto copy_buffer;
+	} else if (cl->read_cb && cl->read_cb->information > 0 &&
+		   cl->read_cb->information <= *offset) {
+		cb = cl->read_cb;
+		rets = 0;
+		goto free;
+	} else if ((!cl->read_cb || !cl->read_cb->information) &&
+		    *offset > 0) {
+		/*Offset needs to be cleaned for contingous reads*/
+		*offset = 0;
+		rets = 0;
+		goto out;
+	}
+
+	err = mei_start_read(dev, cl);
+	if (err && err != -EBUSY) {
+		dev_dbg(&dev->pdev->dev,
+			"mei start read failure with status = %d\n", err);
+		rets = err;
+		goto out;
+	}
+
+	if (MEI_READ_COMPLETE != cl->reading_state &&
+			!waitqueue_active(&cl->rx_wait)) {
+		if (file->f_flags & O_NONBLOCK) {
+			rets = -EAGAIN;
+			goto out;
+		}
+
+		mutex_unlock(&dev->device_lock);
+
+		if (wait_event_interruptible(cl->rx_wait,
+			(MEI_READ_COMPLETE == cl->reading_state ||
+			 MEI_FILE_INITIALIZING == cl->state ||
+			 MEI_FILE_DISCONNECTED == cl->state ||
+			 MEI_FILE_DISCONNECTING == cl->state))) {
+			if (signal_pending(current))
+				return -EINTR;
+			return -ERESTARTSYS;
+		}
+
+		mutex_lock(&dev->device_lock);
+		if (MEI_FILE_INITIALIZING == cl->state ||
+		    MEI_FILE_DISCONNECTED == cl->state ||
+		    MEI_FILE_DISCONNECTING == cl->state) {
+			rets = -EBUSY;
+			goto out;
+		}
+	}
+
+	cb = cl->read_cb;
+
+	if (!cb) {
+		rets = -ENODEV;
+		goto out;
+	}
+	if (cl->reading_state != MEI_READ_COMPLETE) {
+		rets = 0;
+		goto out;
+	}
+	/* now copy the data to user space */
+copy_buffer:
+	dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n",
+	    cb->response_buffer.size);
+	dev_dbg(&dev->pdev->dev, "cb->information - %lu\n",
+	    cb->information);
+	if (length == 0 || ubuf == NULL || *offset > cb->information) {
+		rets = -EMSGSIZE;
+		goto free;
+	}
+
+	/* length is being turncated to PAGE_SIZE, however, */
+	/* information size may be longer */
+	length = min_t(size_t, length, (cb->information - *offset));
+
+	if (copy_to_user(ubuf,
+			 cb->response_buffer.data + *offset,
+			 length)) {
+		rets = -EFAULT;
+		goto free;
+	}
+
+	rets = length;
+	*offset += length;
+	if ((unsigned long)*offset < cb->information)
+		goto out;
+
+free:
+	cb_pos = find_read_list_entry(dev, cl);
+	/* Remove entry from read list */
+	if (cb_pos)
+		list_del(&cb_pos->cb_list);
+	mei_free_cb_private(cb);
+	cl->reading_state = MEI_IDLE;
+	cl->read_cb = NULL;
+	cl->read_pending = 0;
+out:
+	dev_dbg(&dev->pdev->dev, "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_cl *cl = file->private_data;
+	struct mei_cl_cb *write_cb = NULL;
+	struct mei_msg_hdr mei_hdr;
+	struct mei_device *dev;
+	unsigned long timeout = 0;
+	int rets;
+	int i;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->mei_state != MEI_ENABLED) {
+		mutex_unlock(&dev->device_lock);
+		return -ENODEV;
+	}
+
+	if (cl == &dev->iamthif_cl) {
+		write_cb = find_amthi_read_list_entry(dev, file);
+
+		if (write_cb) {
+			timeout = write_cb->read_time +
+					msecs_to_jiffies(IAMTHIF_READ_TIMER);
+
+			if (time_after(jiffies, timeout) ||
+				 cl->reading_state == MEI_READ_COMPLETE) {
+					*offset = 0;
+					list_del(&write_cb->cb_list);
+					mei_free_cb_private(write_cb);
+					write_cb = NULL;
+			}
+		}
+	}
+
+	/* free entry used in read */
+	if (cl->reading_state == MEI_READ_COMPLETE) {
+		*offset = 0;
+		write_cb = find_read_list_entry(dev, cl);
+		if (write_cb) {
+			list_del(&write_cb->cb_list);
+			mei_free_cb_private(write_cb);
+			write_cb = NULL;
+			cl->reading_state = MEI_IDLE;
+			cl->read_cb = NULL;
+			cl->read_pending = 0;
+		}
+	} else if (cl->reading_state == MEI_IDLE &&
+		   !cl->read_pending)
+		*offset = 0;
+
+
+	write_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!write_cb) {
+		mutex_unlock(&dev->device_lock);
+		return -ENOMEM;
+	}
+
+	write_cb->file_object = file;
+	write_cb->file_private = cl;
+	write_cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
+	rets = -ENOMEM;
+	if (!write_cb->request_buffer.data)
+		goto unlock_dev;
+
+	dev_dbg(&dev->pdev->dev, "length =%d\n", (int) length);
+
+	rets = -EFAULT;
+	if (copy_from_user(write_cb->request_buffer.data, ubuf, length))
+		goto unlock_dev;
+
+	cl->sm_state = 0;
+	if (length == 4 &&
+	    ((memcmp(mei_wd_state_independence_msg[0],
+				 write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[1],
+				 write_cb->request_buffer.data, 4) == 0) ||
+	     (memcmp(mei_wd_state_independence_msg[2],
+				 write_cb->request_buffer.data, 4) == 0)))
+		cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
+
+	INIT_LIST_HEAD(&write_cb->cb_list);
+	if (cl == &dev->iamthif_cl) {
+		write_cb->response_buffer.data =
+		    kmalloc(dev->iamthif_mtu, GFP_KERNEL);
+		if (!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_cl.me_client_id)
+				break;
+		}
+
+		if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+		if (i == dev->num_mei_me_clients ||
+		    (dev->me_clients[i].client_id !=
+		      dev->iamthif_cl.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;
+		}
+
+		write_cb->response_buffer.size = dev->iamthif_mtu;
+		write_cb->major_file_operations = MEI_IOCTL;
+		write_cb->information = 0;
+		write_cb->request_buffer.size = length;
+		if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+
+		if (!list_empty(&dev->amthi_cmd_list.mei_cb.cb_list) ||
+				dev->iamthif_state != MEI_IAMTHIF_IDLE) {
+			dev_dbg(&dev->pdev->dev, "amthi_state = %d\n",
+					(int) dev->iamthif_state);
+			dev_dbg(&dev->pdev->dev, "add amthi cb to amthi cmd waiting list\n");
+			list_add_tail(&write_cb->cb_list,
+					&dev->amthi_cmd_list.mei_cb.cb_list);
+			rets = length;
+		} else {
+			dev_dbg(&dev->pdev->dev, "call amthi write\n");
+			rets = amthi_write(dev, write_cb);
+
+			if (rets) {
+				dev_dbg(&dev->pdev->dev, "amthi write failed with status = %d\n",
+				    rets);
+				goto unlock_dev;
+			}
+			rets = length;
+		}
+		mutex_unlock(&dev->device_lock);
+		return rets;
+	}
+
+	write_cb->major_file_operations = MEI_WRITE;
+	/* make sure information is zero before we start */
+
+	write_cb->information = 0;
+	write_cb->request_buffer.size = length;
+
+	dev_dbg(&dev->pdev->dev, "host client = %d, ME client = %d\n",
+	    cl->host_client_id, cl->me_client_id);
+	if (cl->state != MEI_FILE_CONNECTED) {
+		rets = -ENODEV;
+		dev_dbg(&dev->pdev->dev, "host client = %d,  is not connected to ME client = %d",
+		    cl->host_client_id,
+		    cl->me_client_id);
+		goto unlock_dev;
+	}
+	for (i = 0; i < dev->num_mei_me_clients; i++) {
+		if (dev->me_clients[i].client_id ==
+		    cl->me_client_id)
+			break;
+	}
+	if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
+		rets = -ENODEV;
+		goto unlock_dev;
+	}
+	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;
+	}
+	write_cb->file_private = cl;
+
+	rets = mei_flow_ctrl_creds(dev, cl);
+	if (rets < 0)
+		goto unlock_dev;
+
+	if (rets && dev->mei_host_buffer_is_empty) {
+		rets = 0;
+		dev->mei_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 = cl->host_client_id;
+		mei_hdr.me_addr = cl->me_client_id;
+		mei_hdr.reserved = 0;
+		dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n",
+		    *((u32 *) &mei_hdr));
+		if (!mei_write_message(dev, &mei_hdr,
+			(unsigned char *) (write_cb->request_buffer.data),
+			mei_hdr.length)) {
+			rets = -ENODEV;
+			goto unlock_dev;
+		}
+		cl->writing_state = MEI_WRITING;
+		write_cb->information = mei_hdr.length;
+		if (mei_hdr.msg_complete) {
+			if (mei_flow_ctrl_reduce(dev, cl)) {
+				rets = -ENODEV;
+				goto unlock_dev;
+			}
+			list_add_tail(&write_cb->cb_list,
+				      &dev->write_waiting_list.mei_cb.cb_list);
+		} else {
+			list_add_tail(&write_cb->cb_list,
+				      &dev->write_list.mei_cb.cb_list);
+		}
+
+	} else {
+
+		write_cb->information = 0;
+		cl->writing_state = MEI_WRITING;
+		list_add_tail(&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(write_cb);
+	return rets;
+}
+
+
+/**
+ * mei_ioctl - the IOCTL function
+ *
+ * @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 mei_device *dev;
+	struct mei_cl *cl = file->private_data;
+	struct mei_connect_client_data *connect_data = NULL;
+	int rets;
+
+	if (cmd != IOCTL_MEI_CONNECT_CLIENT)
+		return -EINVAL;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd);
+
+	mutex_lock(&dev->device_lock);
+	if (dev->mei_state != MEI_ENABLED) {
+		rets = -ENODEV;
+		goto out;
+	}
+
+	dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
+
+	connect_data = kzalloc(sizeof(struct mei_connect_client_data),
+							GFP_KERNEL);
+	if (!connect_data) {
+		rets = -ENOMEM;
+		goto out;
+	}
+	dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
+	if (copy_from_user(connect_data, (char __user *)data,
+				sizeof(struct mei_connect_client_data))) {
+		dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
+		rets = -EFAULT;
+		goto out;
+	}
+	rets = mei_ioctl_connect_client(file, connect_data);
+
+	/* if all is ok, copying the data back to user. */
+	if (rets)
+		goto out;
+
+	dev_dbg(&dev->pdev->dev, "copy connect data to user\n");
+	if (copy_to_user((char __user *)data, connect_data,
+				sizeof(struct mei_connect_client_data))) {
+		dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
+		rets = -EFAULT;
+		goto out;
+	}
+
+out:
+	kfree(connect_data);
+	mutex_unlock(&dev->device_lock);
+	return rets;
+}
+
+/**
+ * mei_compat_ioctl - the compat IOCTL function
+ *
+ * @file: pointer to file structure
+ * @cmd: ioctl command
+ * @data: pointer to mei message structure
+ *
+ * returns 0 on success , <0 on error
+ */
+#ifdef CONFIG_COMPAT
+static long mei_compat_ioctl(struct file *file,
+		      unsigned int cmd, unsigned long data)
+{
+	return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
+}
+#endif
+
+
+/**
+ * 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)
+{
+	struct mei_cl *cl = file->private_data;
+	struct mei_device *dev;
+	unsigned int mask = 0;
+
+	if (WARN_ON(!cl || !cl->dev))
+		return mask;
+
+	dev = cl->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->mei_state != MEI_ENABLED)
+		goto out;
+
+
+	if (cl == &dev->iamthif_cl) {
+		mutex_unlock(&dev->device_lock);
+		poll_wait(file, &dev->iamthif_cl.wait, wait);
+		mutex_lock(&dev->device_lock);
+		if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
+			dev->iamthif_file_object == file) {
+			mask |= (POLLIN | POLLRDNORM);
+			dev_dbg(&dev->pdev->dev, "run next amthi cb\n");
+			run_next_iamthif_cmd(dev);
+		}
+		goto out;
+	}
+
+	mutex_unlock(&dev->device_lock);
+	poll_wait(file, &cl->tx_wait, wait);
+	mutex_lock(&dev->device_lock);
+	if (MEI_WRITE_COMPLETE == cl->writing_state)
+		mask |= (POLLIN | POLLRDNORM);
+
+out:
+	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 mei_device *dev = pci_get_drvdata(pdev);
+	int err;
+
+	if (!dev)
+		return -ENODEV;
+	mutex_lock(&dev->device_lock);
+	/* Stop watchdog if exists */
+	err = mei_wd_stop(dev, true);
+	/* 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 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 (dev->wd_timeout) {
+		mei_wd_start_setup(dev);
+		dev->wd_due_counter = 1;
+		schedule_delayed_work(&dev->wd_work, HZ);
+	}
+	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,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = mei_compat_ioctl,
+#endif
+	.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;
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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;
+	}
+
+	tmphdev = device_create(class, NULL, mei_cdev.dev, NULL,
+					MEI_DEV_NAME);
+	if (IS_ERR(tmphdev)) {
+		err = PTR_ERR(tmphdev);
+		goto err_destroy;
+	}
+
+	mei_class = class;
+	return 0;
+
+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 (IS_ERR_OR_NULL(mei_class))
+		return;
+
+	device_destroy(mei_class, mei_cdev.dev);
+	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;
+
+	pr_debug("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();
+
+	pr_debug("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);