[PATCH 1/8] staging/mei: PCI device and char driver support.

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

Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Itzhak Tzeel-Krupp <itzhak.tzeel-krupp@xxxxxxxxx>
Signed-off-by: Oren Weil <oren.jer.weil@xxxxxxxxx>
---
 drivers/staging/mei/iorw.c        |  595 ++++++++++++++++
 drivers/staging/mei/main.c        | 1340 +++++++++++++++++++++++++++++++++++++
 drivers/staging/mei/mei.h         |  148 ++++
 drivers/staging/mei/mei_version.h |   31 +
 4 files changed, 2114 insertions(+), 0 deletions(-)
 create mode 100644 drivers/staging/mei/iorw.c
 create mode 100644 drivers/staging/mei/main.c
 create mode 100644 drivers/staging/mei/mei.h
 create mode 100644 drivers/staging/mei/mei_version.h

diff --git a/drivers/staging/mei/iorw.c b/drivers/staging/mei/iorw.c
new file mode 100644
index 0000000..cd76a5b
--- /dev/null
+++ b/drivers/staging/mei/iorw.c
@@ -0,0 +1,595 @@
+/*
+ *
+ * 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/kernel.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/init.h>
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/uuid.h>
+#include <linux/jiffies.h>
+
+#include "hw.h"
+#include "mei.h"
+#include "interface.h"
+#include "mei_version.h"
+
+
+
+/**
+ * mei_ioctl_connect_client - the connect to fw client IOCTL function
+ *
+ * @dev: the device structure
+ * @data: IOCTL connect data, input and output parameters
+ * @file: private data of the file object
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_ioctl_connect_client(struct file *file,
+			struct mei_connect_client_data *data)
+{
+	struct mei_device *dev;
+	struct mei_cl_cb *priv_cb;
+	struct mei_client *client;
+	struct mei_cl *file_ext;
+	struct mei_cl *file_pos = NULL;
+	struct mei_cl *file_next = NULL;
+	long timeout = CONNECT_TIMEOUT;
+	int i;
+	int err;
+	int rets;
+
+	file_ext = file->private_data;
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return -ENODEV;
+
+	dev = file_ext->dev;
+
+	dev_dbg(&dev->pdev->dev, "mei_ioctl_connect_client() Entry\n");
+
+
+	/* buffered ioctl cb */
+	priv_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!priv_cb) {
+		rets = -ENOMEM;
+		goto end;
+	}
+	INIT_LIST_HEAD(&priv_cb->cb_list);
+
+	priv_cb->major_file_operations = MEI_IOCTL;
+
+	if (dev->mei_state != MEI_ENABLED) {
+		rets = -ENODEV;
+		goto end;
+	}
+	if (file_ext->state != MEI_FILE_INITIALIZING &&
+	    file_ext->state != MEI_FILE_DISCONNECTED) {
+		rets = -EBUSY;
+		goto end;
+	}
+
+	/* find ME client we're trying to connect to */
+	i = mei_find_me_client_index(dev, data->in_client_uuid);
+	if (i >= 0 && !dev->me_clients[i].props.fixed_address) {
+		file_ext->me_client_id = dev->me_clients[i].client_id;
+		file_ext->state = MEI_FILE_CONNECTING;
+	}
+
+	dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
+			file_ext->me_client_id);
+	dev_dbg(&dev->pdev->dev, "FW Client - Protocol Version = %d\n",
+			dev->me_clients[i].props.protocol_version);
+	dev_dbg(&dev->pdev->dev, "FW Client - Max Msg Len = %d\n",
+			dev->me_clients[i].props.max_msg_length);
+
+	/* if we're connecting to amthi client so we will use the exist
+	 * connection
+	 */
+	if (uuid_le_cmp(data->in_client_uuid, mei_amthi_guid) == 0) {
+		dev_dbg(&dev->pdev->dev, "FW Client is amthi\n");
+		if (dev->iamthif_file_ext.state != MEI_FILE_CONNECTED) {
+			rets = -ENODEV;
+			goto end;
+		}
+		clear_bit(file_ext->host_client_id, dev->host_clients_map);
+		list_for_each_entry_safe(file_pos, file_next,
+					 &dev->file_list, link) {
+			if (mei_fe_same_id(file_ext, file_pos)) {
+				dev_dbg(&dev->pdev->dev,
+					"remove file private data node host"
+				    " client = %d, ME client = %d.\n",
+				    file_pos->host_client_id,
+				    file_pos->me_client_id);
+				list_del(&file_pos->link);
+			}
+
+		}
+		dev_dbg(&dev->pdev->dev, "free file private data memory.\n");
+		kfree(file_ext);
+
+		file_ext = NULL;
+		file->private_data = &dev->iamthif_file_ext;
+
+		client = &data->out_client_properties;
+		client->max_msg_length =
+			dev->me_clients[i].props.max_msg_length;
+		client->protocol_version =
+			dev->me_clients[i].props.protocol_version;
+		rets = dev->iamthif_file_ext.status;
+
+		goto end;
+	}
+
+	if (file_ext->state != MEI_FILE_CONNECTING) {
+		rets = -ENODEV;
+		goto end;
+	}
+
+
+	/* prepare the output buffer */
+	client = &data->out_client_properties;
+	client->max_msg_length = dev->me_clients[i].props.max_msg_length;
+	client->protocol_version = dev->me_clients[i].props.protocol_version;
+	dev_dbg(&dev->pdev->dev, "Can connect?\n");
+	if (dev->mei_host_buffer_is_empty
+	    && !mei_other_client_is_connecting(dev, file_ext)) {
+		dev_dbg(&dev->pdev->dev, "Sending Connect Message\n");
+		dev->mei_host_buffer_is_empty = 0;
+		if (!mei_connect(dev, file_ext)) {
+			dev_dbg(&dev->pdev->dev, "Sending connect message - failed\n");
+			rets = -ENODEV;
+			goto end;
+		} else {
+			dev_dbg(&dev->pdev->dev, "Sending connect message - succeeded\n");
+			file_ext->timer_count = MEI_CONNECT_TIMEOUT;
+			priv_cb->file_private = file_ext;
+			list_add_tail(&priv_cb->cb_list,
+				      &dev->ctrl_rd_list.mei_cb.
+				      cb_list);
+		}
+
+
+	} else {
+		dev_dbg(&dev->pdev->dev, "Queuing the connect request due to device busy\n");
+		priv_cb->file_private = file_ext;
+		dev_dbg(&dev->pdev->dev, "add connect cb to control write list.\n");
+		list_add_tail(&priv_cb->cb_list,
+			      &dev->ctrl_wr_list.mei_cb.cb_list);
+	}
+	mutex_unlock(&dev->device_lock);
+	err = wait_event_timeout(dev->wait_recvd_msg,
+			(MEI_FILE_CONNECTED == file_ext->state ||
+			 MEI_FILE_DISCONNECTED == file_ext->state),
+			timeout * HZ);
+
+	mutex_lock(&dev->device_lock);
+	if (MEI_FILE_CONNECTED == file_ext->state) {
+		dev_dbg(&dev->pdev->dev, "successfully connected to FW client.\n");
+		rets = file_ext->status;
+		goto end;
+	} else {
+		dev_dbg(&dev->pdev->dev, "failed to connect to FW client.file_ext->state = %d.\n",
+		    file_ext->state);
+		if (!err) {
+			dev_dbg(&dev->pdev->dev,
+				"wait_event_interruptible_timeout failed on client"
+				" connect message fw response message.\n");
+		}
+		rets = -EFAULT;
+
+		mei_flush_list(&dev->ctrl_rd_list, file_ext);
+		mei_flush_list(&dev->ctrl_wr_list, file_ext);
+		goto end;
+	}
+	rets = 0;
+end:
+	dev_dbg(&dev->pdev->dev, "free connect cb memory.");
+	kfree(priv_cb);
+	return rets;
+}
+
+/**
+ * find_amthi_read_list_entry - finds a amthilist entry for current file
+ *
+ * @dev: the device structure
+ * @file: pointer to file object
+ *
+ * returns   returned a list entry on success, NULL on failure.
+ */
+struct mei_cl_cb *find_amthi_read_list_entry(
+		struct mei_device *dev,
+		struct file *file)
+{
+	struct mei_cl *file_ext_temp;
+	struct mei_cl_cb *priv_cb_pos = NULL;
+	struct mei_cl_cb *priv_cb_next = NULL;
+
+	if (!dev->amthi_read_complete_list.status &&
+	    !list_empty(&dev->amthi_read_complete_list.mei_cb.cb_list)) {
+		list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
+		    &dev->amthi_read_complete_list.mei_cb.cb_list, cb_list) {
+			file_ext_temp = (struct mei_cl *)
+					priv_cb_pos->file_private;
+			if (file_ext_temp &&
+			    file_ext_temp == &dev->iamthif_file_ext &&
+			    priv_cb_pos->file_object == file)
+				return priv_cb_pos;
+		}
+	}
+	return NULL;
+}
+
+/**
+ * amthi_read - read data from AMTHI client
+ *
+ * @dev: the device structure
+ * @if_num:  minor number
+ * @file: pointer to file object
+ * @*ubuf: pointer to user data in user space
+ * @length: data length to read
+ * @offset: data read offset
+ *
+ * Locking: called under "dev->device_lock" lock
+ *
+ * returns
+ *  returned data length on success,
+ *  zero if no data to read,
+ *  negative on failure.
+ */
+int amthi_read(struct mei_device *dev, struct file *file,
+	      char __user *ubuf, size_t length, loff_t *offset)
+{
+	int rets;
+	int wait_ret;
+	struct mei_cl_cb *priv_cb = NULL;
+	struct mei_cl *file_ext = file->private_data;
+	unsigned long timeout;
+	int i;
+
+	/* Only Posible if we are in timeout */
+	if (!file_ext || file_ext != &dev->iamthif_file_ext) {
+		dev_dbg(&dev->pdev->dev, "bad file ext.\n");
+		return -ETIMEDOUT;
+	}
+
+	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;
+	}
+
+	if (i == dev->num_mei_me_clients) {
+		dev_dbg(&dev->pdev->dev, "amthi client not found.\n");
+		return -ENODEV;
+	}
+	BUG_ON(dev->me_clients[i].client_id != file_ext->me_client_id);
+
+	dev_dbg(&dev->pdev->dev, "checking amthi data\n");
+	priv_cb = find_amthi_read_list_entry(dev, file);
+
+	/* Check for if we can block or not*/
+	if (priv_cb == NULL && file->f_flags & O_NONBLOCK)
+		return -EAGAIN;
+
+
+	dev_dbg(&dev->pdev->dev, "waiting for amthi data\n");
+	while (priv_cb == NULL) {
+		/* unlock the Mutex */
+		mutex_unlock(&dev->device_lock);
+
+		wait_ret = wait_event_interruptible(dev->iamthif_file_ext.wait,
+			(priv_cb = find_amthi_read_list_entry(dev, file)));
+
+		if (wait_ret)
+			return -ERESTARTSYS;
+
+		dev_dbg(&dev->pdev->dev, "woke up from sleep\n");
+
+		/* Locking again the Mutex */
+		mutex_lock(&dev->device_lock);
+	}
+
+
+	dev_dbg(&dev->pdev->dev, "Got amthi data\n");
+	dev->iamthif_timer = 0;
+
+	if (priv_cb) {
+		timeout = priv_cb->read_time +
+					msecs_to_jiffies(IAMTHIF_READ_TIMER);
+		dev_dbg(&dev->pdev->dev, "amthi timeout = %lud\n",
+				timeout);
+
+		if  (time_after(jiffies, timeout)) {
+			dev_dbg(&dev->pdev->dev, "amthi Time out\n");
+			/* 15 sec for the message has expired */
+			list_del(&priv_cb->cb_list);
+			rets = -ETIMEDOUT;
+			goto free;
+		}
+	}
+	/* if the whole message will fit remove it from the list */
+	if (priv_cb->information >= *offset &&
+	    length >= (priv_cb->information - *offset))
+		list_del(&priv_cb->cb_list);
+	else if (priv_cb->information > 0 && priv_cb->information <= *offset) {
+		/* end of the message has been reached */
+		list_del(&priv_cb->cb_list);
+		rets = 0;
+		goto free;
+	}
+		/* else means that not full buffer will be read and do not
+		 * remove message from deletion list
+		 */
+
+	dev_dbg(&dev->pdev->dev, "amthi priv_cb->response_buffer size - %d\n",
+	    priv_cb->response_buffer.size);
+	dev_dbg(&dev->pdev->dev, "amthi priv_cb->information - %lu\n",
+	    priv_cb->information);
+
+	/* length is being turncated to PAGE_SIZE, however,
+	 * the information may be longer */
+	length = min_t(size_t, length, (priv_cb->information - *offset));
+
+	if (copy_to_user(ubuf,
+			 priv_cb->response_buffer.data + *offset,
+			 length))
+		rets = -EFAULT;
+	else {
+		rets = length;
+		if ((*offset + length) < priv_cb->information) {
+			*offset += length;
+			goto out;
+		}
+	}
+free:
+	dev_dbg(&dev->pdev->dev, "free amthi cb memory.\n");
+	*offset = 0;
+	mei_free_cb_private(priv_cb);
+out:
+	return rets;
+}
+
+/**
+ * mei_start_read - the start read client message function.
+ *
+ * @dev: the device structure
+ * @if_num:  minor number
+ * @file_ext: private data of the file object
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int mei_start_read(struct mei_device *dev, struct mei_cl *file_ext)
+{
+	struct mei_cl_cb *priv_cb;
+	int rets = 0;
+	int i;
+
+	if (file_ext->state != MEI_FILE_CONNECTED)
+		return -ENODEV;
+
+	if (dev->mei_state != MEI_ENABLED)
+		return -ENODEV;
+
+	dev_dbg(&dev->pdev->dev, "check if read is pending.\n");
+	if (file_ext->read_pending || file_ext->read_cb) {
+		dev_dbg(&dev->pdev->dev, "read is pending.\n");
+		return -EBUSY;
+	}
+
+	priv_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
+	if (!priv_cb)
+		return -ENOMEM;
+
+	dev_dbg(&dev->pdev->dev, "allocation call back successful. host client = %d, ME client = %d\n",
+		file_ext->host_client_id, file_ext->me_client_id);
+
+	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;
+	}
+
+	priv_cb->response_buffer.size = dev->me_clients[i].props.max_msg_length;
+	priv_cb->response_buffer.data =
+	    kmalloc(priv_cb->response_buffer.size, GFP_KERNEL);
+	if (!priv_cb->response_buffer.data) {
+		rets = -ENOMEM;
+		goto unlock;
+	}
+	dev_dbg(&dev->pdev->dev, "allocation call back data success.\n");
+	priv_cb->major_file_operations = MEI_READ;
+	/* make sure information is zero before we start */
+	priv_cb->information = 0;
+	priv_cb->file_private = (void *) file_ext;
+	file_ext->read_cb = priv_cb;
+	if (dev->mei_host_buffer_is_empty) {
+		dev->mei_host_buffer_is_empty = 0;
+		if (!mei_send_flow_control(dev, file_ext)) {
+			rets = -ENODEV;
+			goto unlock;
+		} else {
+			list_add_tail(&priv_cb->cb_list,
+				      &dev->read_list.mei_cb.cb_list);
+		}
+	} else {
+		list_add_tail(&priv_cb->cb_list,
+			      &dev->ctrl_wr_list.mei_cb.cb_list);
+	}
+	return rets;
+unlock:
+	mei_free_cb_private(priv_cb);
+	return rets;
+}
+
+/**
+ * amthi_write - write iamthif data to amthi client
+ *
+ * @dev: the device structure
+ * @priv_cb: mei call back struct
+ *
+ * returns 0 on success, <0 on failure.
+ */
+int amthi_write(struct mei_device *dev,
+	       struct mei_cl_cb *priv_cb)
+{
+	struct mei_msg_hdr mei_hdr;
+
+	if (!dev || !priv_cb)
+		return -ENODEV;
+
+	dev_dbg(&dev->pdev->dev, "write data to amthi client.\n");
+
+	dev->iamthif_state = MEI_IAMTHIF_WRITING;
+	dev->iamthif_current_cb = priv_cb;
+	dev->iamthif_file_object = priv_cb->file_object;
+	dev->iamthif_canceled = 0;
+	dev->iamthif_ioctl = 1;
+	dev->iamthif_msg_buf_size = priv_cb->request_buffer.size;
+	memcpy(dev->iamthif_msg_buf, priv_cb->request_buffer.data,
+	    priv_cb->request_buffer.size);
+
+	if (mei_flow_ctrl_creds(dev, &dev->iamthif_file_ext) &&
+	    dev->mei_host_buffer_is_empty) {
+		dev->mei_host_buffer_is_empty = 0;
+		if (priv_cb->request_buffer.size >
+			(((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 = priv_cb->request_buffer.size;
+			mei_hdr.msg_complete = 1;
+		}
+
+		mei_hdr.host_addr = dev->iamthif_file_ext.host_client_id;
+		mei_hdr.me_addr = dev->iamthif_file_ext.me_client_id;
+		mei_hdr.reserved = 0;
+		dev->iamthif_msg_buf_index += mei_hdr.length;
+		if (!mei_write_message(dev, &mei_hdr,
+					(unsigned char *)(dev->iamthif_msg_buf),
+					mei_hdr.length))
+			return -ENODEV;
+
+		if (mei_hdr.msg_complete) {
+			mei_flow_ctrl_reduce(dev, &dev->iamthif_file_ext);
+			dev->iamthif_flow_control_pending = 1;
+			dev->iamthif_state = MEI_IAMTHIF_FLOW_CONTROL;
+			dev_dbg(&dev->pdev->dev, "add amthi cb to write waiting list\n");
+			dev->iamthif_current_cb = priv_cb;
+			dev->iamthif_file_object = priv_cb->file_object;
+			list_add_tail(&priv_cb->cb_list,
+				      &dev->write_waiting_list.mei_cb.cb_list);
+		} else {
+			dev_dbg(&dev->pdev->dev, "message does not complete, "
+					"so add amthi cb to write list.\n");
+			list_add_tail(&priv_cb->cb_list,
+				      &dev->write_list.mei_cb.cb_list);
+		}
+	} else {
+		if (!(dev->mei_host_buffer_is_empty))
+			dev_dbg(&dev->pdev->dev, "host buffer is not empty");
+
+		dev_dbg(&dev->pdev->dev, "No flow control credentials, "
+				"so add iamthif cb to write list.\n");
+		list_add_tail(&priv_cb->cb_list,
+			      &dev->write_list.mei_cb.cb_list);
+	}
+	return 0;
+}
+
+/**
+ * iamthif_ioctl_send_msg - send cmd data to amthi client
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success, <0 on failure.
+ */
+void run_next_iamthif_cmd(struct mei_device *dev)
+{
+	struct mei_cl *file_ext_tmp;
+	struct mei_cl_cb *priv_cb_pos = NULL;
+	struct mei_cl_cb *priv_cb_next = NULL;
+	int status;
+
+	if (!dev)
+		return;
+
+	dev->iamthif_msg_buf_size = 0;
+	dev->iamthif_msg_buf_index = 0;
+	dev->iamthif_canceled = 0;
+	dev->iamthif_ioctl = 1;
+	dev->iamthif_state = MEI_IAMTHIF_IDLE;
+	dev->iamthif_timer = 0;
+	dev->iamthif_file_object = NULL;
+
+	if (dev->amthi_cmd_list.status == 0 &&
+	    !list_empty(&dev->amthi_cmd_list.mei_cb.cb_list)) {
+		dev_dbg(&dev->pdev->dev, "complete amthi cmd_list cb.\n");
+
+		list_for_each_entry_safe(priv_cb_pos, priv_cb_next,
+		    &dev->amthi_cmd_list.mei_cb.cb_list, cb_list) {
+			list_del(&priv_cb_pos->cb_list);
+			file_ext_tmp = (struct mei_cl *)
+					priv_cb_pos->file_private;
+
+			if (file_ext_tmp &&
+			    file_ext_tmp == &dev->iamthif_file_ext) {
+				status = amthi_write(dev, priv_cb_pos);
+				if (status) {
+					dev_dbg(&dev->pdev->dev,
+						"amthi write failed status = %d\n",
+							status);
+					return;
+				}
+				break;
+			}
+		}
+	}
+}
+
+/**
+ * mei_free_cb_private - free mei_cb_private related memory
+ *
+ * @priv_cb: mei callback struct
+ */
+void mei_free_cb_private(struct mei_cl_cb *priv_cb)
+{
+	if (priv_cb == NULL)
+		return;
+
+	kfree(priv_cb->request_buffer.data);
+	kfree(priv_cb->response_buffer.data);
+	kfree(priv_cb);
+}
diff --git a/drivers/staging/mei/main.c b/drivers/staging/mei/main.c
new file mode 100644
index 0000000..b63157d
--- /dev/null
+++ b/drivers/staging/mei/main.c
@@ -0,0 +1,1340 @@
+/*
+ *
+ * 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 "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:
+	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 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_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_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_file_ext.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)
+		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
+ *
+ * @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 *priv_cb_pos = NULL;
+	struct mei_cl_cb *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 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 *file_ext)
+{
+	struct mei_cl_cb *priv_cb_pos = NULL;
+	struct mei_cl_cb *priv_cb_next = NULL;
+	struct mei_cl *file_ext_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(priv_cb_pos,
+				priv_cb_next,
+				&dev->read_list.mei_cb.cb_list, cb_list) {
+
+			file_ext_list_temp = (struct mei_cl *)
+				priv_cb_pos->file_private;
+
+			if (file_ext_list_temp &&
+			    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_cl *file_ext;
+	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;
+	file_ext = mei_alloc_file_private(dev);
+	if (!file_ext)
+		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;
+
+	file_ext->host_client_id = find_first_zero_bit(dev->host_clients_map,
+							MEI_CLIENTS_MAX);
+	if (file_ext->host_client_id > MEI_CLIENTS_MAX)
+		goto out_unlock;
+
+	dev_dbg(&dev->pdev->dev, "client_id = %d\n", file_ext->host_client_id);
+
+	dev->open_handle_count++;
+	list_add_tail(&file_ext->link, &dev->file_list);
+
+	set_bit(file_ext->host_client_id, dev->host_clients_map);
+	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_cl *file_ext = file->private_data;
+	struct mei_cl_cb *priv_cb;
+	struct mei_device *dev;
+	int rets = 0;
+
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return -ENODEV;
+
+	dev = file_ext->dev;
+
+	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;
+			dev_dbg(&dev->pdev->dev,
+				"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);
+		dev_dbg(&dev->pdev->dev, "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) {
+			clear_bit(file_ext->host_client_id,
+				  dev->host_clients_map);
+			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) {
+			priv_cb = find_read_list_entry(dev, file_ext);
+			/* Remove entry from read list */
+			if (priv_cb)
+				list_del(&priv_cb->cb_list);
+
+			priv_cb = file_ext->read_cb;
+			file_ext->read_cb = NULL;
+		}
+
+		file->private_data = NULL;
+
+		if (priv_cb) {
+			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) {
+
+			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 *file_ext = file->private_data;
+	struct mei_cl_cb *priv_cb_pos = NULL;
+	struct mei_cl_cb *priv_cb = NULL;
+	struct mei_device *dev;
+	int i;
+	int rets;
+	int err;
+
+
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return -ENODEV;
+
+	dev = file_ext->dev;
+
+	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 */
+		i = mei_find_me_client_index(dev, mei_wd_guid);
+		if (i >= 0) {
+			struct mei_me_client *me_client = &dev->me_clients[i];
+
+			if (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 = amthi_read(dev, 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) &&
+		    *offset > 0) {
+		/*Offset needs to be cleaned for contingous reads*/
+		*offset = 0;
+		rets = 0;
+		goto out;
+	}
+
+	err = mei_start_read(dev, file_ext);
+	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 != 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:
+	dev_dbg(&dev->pdev->dev, "priv_cb->response_buffer size - %d\n",
+	    priv_cb->response_buffer.size);
+	dev_dbg(&dev->pdev->dev, "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 = min_t(size_t, 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)
+		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:
+	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 *file_ext = file->private_data;
+	struct mei_cl_cb *priv_write_cb = NULL;
+	struct mei_msg_hdr mei_hdr;
+	struct mei_device *dev;
+	unsigned long timeout = 0;
+	int rets;
+	int i;
+
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return -ENODEV;
+
+	dev = file_ext->dev;
+
+	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_amthi_read_list_entry(dev, file);
+
+		if (priv_write_cb) {
+			timeout = priv_write_cb->read_time +
+					msecs_to_jiffies(IAMTHIF_READ_TIMER);
+
+			if (time_after(jiffies, timeout) ||
+				 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) {
+			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)
+		*offset = 0;
+
+
+	priv_write_cb = kzalloc(sizeof(struct mei_cl_cb), 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;
+
+	dev_dbg(&dev->pdev->dev, "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->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(&priv_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, priv_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;
+	}
+
+	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;
+
+	dev_dbg(&dev->pdev->dev, "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;
+		dev_dbg(&dev->pdev->dev, "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 (mei_flow_ctrl_creds(dev, file_ext) &&
+		dev->mei_host_buffer_is_empty) {
+		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 = file_ext->host_client_id;
+		mei_hdr.me_addr = file_ext->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 *) (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) {
+			mei_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
+ *
+ * @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 *file_ext = file->private_data;
+	struct mei_connect_client_data *connect_data = NULL;
+	int rets;
+
+	if (cmd != IOCTL_MEI_CONNECT_CLIENT)
+		return -EINVAL;
+
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return -ENODEV;
+
+	dev = file_ext->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 *file_ext = file->private_data;
+	struct mei_device *dev;
+	unsigned int mask = 0;
+
+	if (WARN_ON(!file_ext || !file_ext->dev))
+		return mask;
+
+	dev = file_ext->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (dev->mei_state != MEI_ENABLED)
+		goto out;
+
+
+	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);
+			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, &file_ext->tx_wait, wait);
+	mutex_lock(&dev->device_lock);
+	if (MEI_WRITE_COMPLETE == file_ext->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);
diff --git a/drivers/staging/mei/mei.h b/drivers/staging/mei/mei.h
new file mode 100644
index 0000000..d570b80
--- /dev/null
+++ b/drivers/staging/mei/mei.h
@@ -0,0 +1,148 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+
+#ifndef _MEI_H_
+#define _MEI_H_
+
+#include <linux/mei.h>
+#include <linux/interrupt.h>
+#include "hw.h"
+
+
+#define CONNECT_TIMEOUT        15	/* HPS definition */
+#define INIT_CLIENTS_TIMEOUT   15	/* HPS definition */
+
+extern const uuid_le mei_amthi_guid;
+extern const uuid_le mei_wd_guid;
+extern const u8 mei_wd_state_independence_msg[3][4];
+
+/*
+ * mei device ID
+ */
+#define    MEI_DEV_ID_82946GZ	0x2974  /* 82946GZ/GL */
+#define    MEI_DEV_ID_82G35	0x2984  /* 82G35 Express */
+#define    MEI_DEV_ID_82Q965	0x2994  /* 82Q963/Q965 */
+#define    MEI_DEV_ID_82G965	0x29A4  /* 82P965/G965 */
+
+#define    MEI_DEV_ID_82GM965	0x2A04  /* Mobile PM965/GM965 */
+#define    MEI_DEV_ID_82GME965	0x2A14  /* Mobile GME965/GLE960 */
+
+#define    MEI_DEV_ID_ICH9_82Q35 0x29B4  /* 82Q35 Express */
+#define    MEI_DEV_ID_ICH9_82G33 0x29C4  /* 82G33/G31/P35/P31 Express */
+#define    MEI_DEV_ID_ICH9_82Q33 0x29D4  /* 82Q33 Express */
+#define    MEI_DEV_ID_ICH9_82X38 0x29E4  /* 82X38/X48 Express */
+#define    MEI_DEV_ID_ICH9_3200  0x29F4  /* 3200/3210 Server */
+
+#define    MEI_DEV_ID_ICH9_6	0x28B4  /* Bearlake */
+#define    MEI_DEV_ID_ICH9_7	0x28C4  /* Bearlake */
+#define    MEI_DEV_ID_ICH9_8	0x28D4  /* Bearlake */
+#define    MEI_DEV_ID_ICH9_9    0x28E4  /* Bearlake */
+#define    MEI_DEV_ID_ICH9_10	0x28F4  /* Bearlake */
+
+#define    MEI_DEV_ID_ICH9M_1	0x2A44  /* Cantiga */
+#define    MEI_DEV_ID_ICH9M_2	0x2A54  /* Cantiga */
+#define    MEI_DEV_ID_ICH9M_3	0x2A64  /* Cantiga */
+#define    MEI_DEV_ID_ICH9M_4	0x2A74  /* Cantiga */
+
+#define    MEI_DEV_ID_ICH10_1	0x2E04  /* Eaglelake */
+#define    MEI_DEV_ID_ICH10_2	0x2E14  /* Eaglelake */
+#define    MEI_DEV_ID_ICH10_3	0x2E24  /* Eaglelake */
+#define    MEI_DEV_ID_ICH10_4	0x2E34  /* Eaglelake */
+
+#define    MEI_DEV_ID_IBXPK_1	0x3B64  /* Calpella */
+#define    MEI_DEV_ID_IBXPK_2	0x3B65  /* Calpella */
+
+#define    MEI_DEV_ID_CPT_1	0x1C3A    /* Cougerpoint */
+#define    MEI_DEV_ID_PBG_1	0x1D3A    /* PBG */
+
+#define    MEI_DEV_ID_PPT_1	0x1E3A    /* Pantherpoint PPT */
+#define    MEI_DEV_ID_PPT_2	0x1CBA    /* Pantherpoint PPT */
+#define    MEI_DEV_ID_PPT_3	0x1DBA    /* Pantherpoint PPT */
+
+
+/*
+ * mei init function prototypes
+ */
+struct mei_device *init_mei_device(struct pci_dev *pdev);
+void mei_reset(struct mei_device *dev, int interrupts);
+int mei_hw_init(struct mei_device *dev);
+int mei_task_initialize_clients(void *data);
+int mei_initialize_clients(struct mei_device *dev);
+struct mei_cl *mei_alloc_file_private(struct mei_device *dev);
+int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *file_ext);
+void mei_initialize_list(struct mei_io_list *list,
+			  struct mei_device *dev);
+void mei_flush_list(struct mei_io_list *list, struct mei_cl *file_ext);
+void mei_flush_queues(struct mei_device *dev, struct mei_cl *file_ext);
+
+void mei_remove_client_from_file_list(struct mei_device *dev,
+				       u8 host_client_id);
+void host_start_message(struct mei_device *dev);
+void host_enum_clients_message(struct mei_device *dev);
+void allocate_me_clients_storage(struct mei_device *dev);
+void host_client_properties(struct mei_device *dev);
+void host_init_iamthif(struct mei_device *dev);
+void mei_init_file_private(struct mei_cl *priv, struct mei_device *dev);
+
+u8 mei_find_me_client_update_filext(struct mei_device *dev,
+				struct mei_cl *priv,
+				const uuid_le *cguid, u8 client_id);
+/*
+ *  interrupt functions prototype
+ */
+irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id);
+irqreturn_t  mei_interrupt_thread_handler(int irq, void *dev_id);
+void mei_wd_timer(struct work_struct *work);
+
+/*
+ *  input output function prototype
+ */
+int mei_ioctl_connect_client(struct file *file,
+			struct mei_connect_client_data *data);
+
+int mei_start_read(struct mei_device *dev, struct mei_cl *file_ext);
+
+int amthi_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
+
+int amthi_read(struct mei_device *dev, struct file *file,
+	      char __user *ubuf, size_t length, loff_t *offset);
+
+struct mei_cl_cb *find_amthi_read_list_entry(struct mei_device *dev,
+						struct file *file);
+
+void run_next_iamthif_cmd(struct mei_device *dev);
+
+void mei_free_cb_private(struct mei_cl_cb *priv_cb);
+
+int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid);
+
+
+/**
+ * mei_fe_same_id - tells if file private data have same id
+ *
+ * @fe1: private data of 1. file object
+ * @fe2: private data of 2. file object
+ *
+ * returns !=0 - if ids are the same, 0 - if differ.
+ */
+static inline int mei_fe_same_id(const struct mei_cl *fe1,
+				  const struct mei_cl *fe2)
+{
+	return ((fe1->host_client_id == fe2->host_client_id) &&
+		(fe1->me_client_id == fe2->me_client_id));
+}
+#endif /* _MEI_H_ */
diff --git a/drivers/staging/mei/mei_version.h b/drivers/staging/mei/mei_version.h
new file mode 100644
index 0000000..075bad8
--- /dev/null
+++ b/drivers/staging/mei/mei_version.h
@@ -0,0 +1,31 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+
+#ifndef MEI_VERSION_H
+#define MEI_VERSION_H
+
+#define MAJOR_VERSION		7
+#define MINOR_VERSION		1
+#define QUICK_FIX_NUMBER	20
+#define VER_BUILD		1
+
+#define MEI_DRV_VER1 __stringify(MAJOR_VERSION) "." __stringify(MINOR_VERSION)
+#define MEI_DRV_VER2 __stringify(QUICK_FIX_NUMBER) "." __stringify(VER_BUILD)
+
+#define MEI_DRIVER_VERSION	MEI_DRV_VER1 "." MEI_DRV_VER2
+
+#endif
-- 
1.7.1

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