drivers/misc/mei/pci-me.c - kernel/msm-4.9 - Gitiles

 /*
  *
  * Intel Management Engine Interface (Intel MEI) Linux driver
  * Copyright (c) 2003-2012, 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.
  *
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #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/sched.h>
 #include <linux/uuid.h>
 #include <linux/compat.h>
 #include <linux/jiffies.h>
 #include <linux/interrupt.h>
 #include <linux/miscdevice.h>

 #include <linux/mei.h>

 #include "mei_dev.h"
 #include "hw-me.h"
 #include "client.h"

 /* AMT device is a singleton on the platform */
 static struct pci_dev *mei_pdev;

 /* 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)},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},

 	/* required last entry */
 	{0, }
 };

 MODULE_DEVICE_TABLE(pci, mei_pci_tbl);

 static DEFINE_MUTEX(mei_mutex);


 /**
  * mei_quirk_probe - probe for devices that doesn't valid ME interface
  * @pdev: PCI device structure
  * @ent: entry into pci_device_table
  *
  * returns true if ME Interface is valid, false otherwise
  */
 static bool mei_quirk_probe(struct pci_dev *pdev,
 				const struct pci_device_id *ent)
 {
 	u32 reg;
 	if (ent->device == MEI_DEV_ID_PBG_1) {
 		pci_read_config_dword(pdev, 0x48, &reg);
 		/* make sure that bit 9 is up and bit 10 is down */
 		if ((reg & 0x600) == 0x200) {
 			dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
 			return false;
 		}
 	}
 	return true;
 }
 /**
  * mei_probe - Device Initialization Routine
  *
  * @pdev: PCI device structure
  * @ent: entry in kcs_pci_tbl
  *
  * returns 0 on success, <0 on failure.
  */
 static int mei_probe(struct pci_dev *pdev,
 				const struct pci_device_id *ent)
 {
 	struct mei_device *dev;
 	int err;

 	mutex_lock(&mei_mutex);

 	if (!mei_quirk_probe(pdev, ent)) {
 		err = -ENODEV;
 		goto end;
 	}

 	if (mei_pdev) {
 		err = -EEXIST;
 		goto end;
 	}
 	/* enable pci dev */
 	err = pci_enable_device(pdev);
 	if (err) {
 		dev_err(&pdev->dev, "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, KBUILD_MODNAME);
 	if (err) {
 		dev_err(&pdev->dev, "failed to get pci regions.\n");
 		goto disable_device;
 	}
 	/* allocates and initializes the mei dev structure */
 	dev = mei_device_init(pdev);
 	if (!dev) {
 		err = -ENOMEM;
 		goto release_regions;
 	}
 	/* mapping  IO device memory */
 	dev->mem_addr = pci_iomap(pdev, 0, 0);
 	if (!dev->mem_addr) {
 		dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
 		err = -ENOMEM;
 		goto free_device;
 	}
 	pci_enable_msi(pdev);

 	 /* request and enable interrupt */
 	if (pci_dev_msi_enabled(pdev))
 		err = request_threaded_irq(pdev->irq,
 			NULL,
 			mei_interrupt_thread_handler,
 			IRQF_ONESHOT, KBUILD_MODNAME, dev);
 	else
 		err = request_threaded_irq(pdev->irq,
 			mei_interrupt_quick_handler,
 			mei_interrupt_thread_handler,
 			IRQF_SHARED, KBUILD_MODNAME, dev);

 	if (err) {
 		dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
 		       pdev->irq);
 		goto disable_msi;
 	}

 	if (mei_hw_init(dev)) {
 		dev_err(&pdev->dev, "init hw failure.\n");
 		err = -ENODEV;
 		goto release_irq;
 	}

 	err = mei_register(&pdev->dev);
 	if (err)
 		goto release_irq;

 	mei_pdev = pdev;
 	pci_set_drvdata(pdev, dev);


 	schedule_delayed_work(&dev->timer_work, HZ);

 	mutex_unlock(&mei_mutex);

 	pr_debug("initialization successful.\n");

 	return 0;

 release_irq:
 	mei_disable_interrupts(dev);
 	flush_scheduled_work();
 	free_irq(pdev->irq, dev);
 disable_msi:
 	pci_disable_msi(pdev);
 	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);
 	dev_err(&pdev->dev, "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 mei_remove(struct pci_dev *pdev)
 {
 	struct mei_device *dev;

 	if (mei_pdev != pdev)
 		return;

 	dev = pci_get_drvdata(pdev);
 	if (!dev)
 		return;

 	mutex_lock(&dev->device_lock);

 	cancel_delayed_work(&dev->timer_work);

 	mei_wd_stop(dev);

 	mei_pdev = NULL;

 	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
 		dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
 		mei_cl_disconnect(&dev->iamthif_cl);
 	}
 	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
 		dev->wd_cl.state = MEI_FILE_DISCONNECTING;
 		mei_cl_disconnect(&dev->wd_cl);
 	}

 	/* Unregistering watchdog device */
 	mei_watchdog_unregister(dev);

 	/* remove entry if already in list */
 	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");

 	if (dev->open_handle_count > 0)
 		dev->open_handle_count--;
 	mei_cl_unlink(&dev->wd_cl);

 	if (dev->open_handle_count > 0)
 		dev->open_handle_count--;
 	mei_cl_unlink(&dev->iamthif_cl);

 	dev->iamthif_current_cb = NULL;
 	dev->me_clients_num = 0;

 	mutex_unlock(&dev->device_lock);

 	flush_scheduled_work();

 	/* disable interrupts */
 	mei_disable_interrupts(dev);

 	free_irq(pdev->irq, dev);
 	pci_disable_msi(pdev);
 	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_deregister();

 }
 #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);

 	cancel_delayed_work(&dev->timer_work);

 	/* Stop watchdog if exists */
 	err = mei_wd_stop(dev);
 	/* Set new mei state */
 	if (dev->dev_state == MEI_DEV_ENABLED ||
 	    dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
 		dev->dev_state = MEI_DEV_POWER_DOWN;
 		mei_reset(dev, 0);
 	}
 	mutex_unlock(&dev->device_lock);

 	free_irq(pdev->irq, dev);
 	pci_disable_msi(pdev);

 	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;

 	pci_enable_msi(pdev);

 	/* request and enable interrupt */
 	if (pci_dev_msi_enabled(pdev))
 		err = request_threaded_irq(pdev->irq,
 			NULL,
 			mei_interrupt_thread_handler,
 			IRQF_ONESHOT, KBUILD_MODNAME, dev);
 	else
 		err = request_threaded_irq(pdev->irq,
 			mei_interrupt_quick_handler,
 			mei_interrupt_thread_handler,
 			IRQF_SHARED, KBUILD_MODNAME, dev);

 	if (err) {
 		dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
 				pdev->irq);
 		return err;
 	}

 	mutex_lock(&dev->device_lock);
 	dev->dev_state = MEI_DEV_POWER_UP;
 	mei_reset(dev, 1);
 	mutex_unlock(&dev->device_lock);

 	/* Start timer if stopped in suspend */
 	schedule_delayed_work(&dev->timer_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 MEI_PM_OPS	NULL
 #endif /* CONFIG_PM */
 /*
  *  PCI driver structure
  */
 static struct pci_driver mei_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = mei_pci_tbl,
 	.probe = mei_probe,
 	.remove = mei_remove,
 	.shutdown = mei_remove,
 	.driver.pm = MEI_PM_OPS,
 };

 module_pci_driver(mei_driver);

 MODULE_AUTHOR("Intel Corporation");
 MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
 MODULE_LICENSE("GPL v2");
	/*
	*
	* Intel Management Engine Interface (Intel MEI) Linux driver
	* Copyright (c) 2003-2012, 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.
	*
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#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/sched.h>
	#include <linux/uuid.h>
	#include <linux/compat.h>
	#include <linux/jiffies.h>
	#include <linux/interrupt.h>
	#include <linux/miscdevice.h>

	#include <linux/mei.h>

	#include "mei_dev.h"
	#include "hw-me.h"
	#include "client.h"

	/* AMT device is a singleton on the platform */
	static struct pci_dev *mei_pdev;

	/* 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)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT)},
	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},

	/* required last entry */
	{0, }
	};

	MODULE_DEVICE_TABLE(pci, mei_pci_tbl);

	static DEFINE_MUTEX(mei_mutex);


	/**
	* mei_quirk_probe - probe for devices that doesn't valid ME interface
	* @pdev: PCI device structure
	* @ent: entry into pci_device_table
	*
	* returns true if ME Interface is valid, false otherwise
	*/
	static bool mei_quirk_probe(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	u32 reg;
	if (ent->device == MEI_DEV_ID_PBG_1) {
	pci_read_config_dword(pdev, 0x48, &reg);
	/* make sure that bit 9 is up and bit 10 is down */
	if ((reg & 0x600) == 0x200) {
	dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
	return false;
	}
	}
	return true;
	}
	/**
	* mei_probe - Device Initialization Routine
	*
	* @pdev: PCI device structure
	* @ent: entry in kcs_pci_tbl
	*
	* returns 0 on success, <0 on failure.
	*/
	static int mei_probe(struct pci_dev *pdev,
	const struct pci_device_id *ent)
	{
	struct mei_device *dev;
	int err;

	mutex_lock(&mei_mutex);

	if (!mei_quirk_probe(pdev, ent)) {
	err = -ENODEV;
	goto end;
	}

	if (mei_pdev) {
	err = -EEXIST;
	goto end;
	}
	/* enable pci dev */
	err = pci_enable_device(pdev);
	if (err) {
	dev_err(&pdev->dev, "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, KBUILD_MODNAME);
	if (err) {
	dev_err(&pdev->dev, "failed to get pci regions.\n");
	goto disable_device;
	}
	/* allocates and initializes the mei dev structure */
	dev = mei_device_init(pdev);
	if (!dev) {
	err = -ENOMEM;
	goto release_regions;
	}
	/* mapping IO device memory */
	dev->mem_addr = pci_iomap(pdev, 0, 0);
	if (!dev->mem_addr) {
	dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
	err = -ENOMEM;
	goto free_device;
	}
	pci_enable_msi(pdev);

	/* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
	err = request_threaded_irq(pdev->irq,
	NULL,
	mei_interrupt_thread_handler,
	IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
	err = request_threaded_irq(pdev->irq,
	mei_interrupt_quick_handler,
	mei_interrupt_thread_handler,
	IRQF_SHARED, KBUILD_MODNAME, dev);

	if (err) {
	dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
	pdev->irq);
	goto disable_msi;
	}

	if (mei_hw_init(dev)) {
	dev_err(&pdev->dev, "init hw failure.\n");
	err = -ENODEV;
	goto release_irq;
	}

	err = mei_register(&pdev->dev);
	if (err)
	goto release_irq;

	mei_pdev = pdev;
	pci_set_drvdata(pdev, dev);


	schedule_delayed_work(&dev->timer_work, HZ);

	mutex_unlock(&mei_mutex);

	pr_debug("initialization successful.\n");

	return 0;

	release_irq:
	mei_disable_interrupts(dev);
	flush_scheduled_work();
	free_irq(pdev->irq, dev);
	disable_msi:
	pci_disable_msi(pdev);
	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);
	dev_err(&pdev->dev, "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 mei_remove(struct pci_dev *pdev)
	{
	struct mei_device *dev;

	if (mei_pdev != pdev)
	return;

	dev = pci_get_drvdata(pdev);
	if (!dev)
	return;

	mutex_lock(&dev->device_lock);

	cancel_delayed_work(&dev->timer_work);

	mei_wd_stop(dev);

	mei_pdev = NULL;

	if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
	dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
	mei_cl_disconnect(&dev->iamthif_cl);
	}
	if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
	dev->wd_cl.state = MEI_FILE_DISCONNECTING;
	mei_cl_disconnect(&dev->wd_cl);
	}

	/* Unregistering watchdog device */
	mei_watchdog_unregister(dev);

	/* remove entry if already in list */
	dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");

	if (dev->open_handle_count > 0)
	dev->open_handle_count--;
	mei_cl_unlink(&dev->wd_cl);

	if (dev->open_handle_count > 0)
	dev->open_handle_count--;
	mei_cl_unlink(&dev->iamthif_cl);

	dev->iamthif_current_cb = NULL;
	dev->me_clients_num = 0;

	mutex_unlock(&dev->device_lock);

	flush_scheduled_work();

	/* disable interrupts */
	mei_disable_interrupts(dev);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);
	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_deregister();

	}
	#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);

	cancel_delayed_work(&dev->timer_work);

	/* Stop watchdog if exists */
	err = mei_wd_stop(dev);
	/* Set new mei state */
	if (dev->dev_state == MEI_DEV_ENABLED \|\|
	dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) {
	dev->dev_state = MEI_DEV_POWER_DOWN;
	mei_reset(dev, 0);
	}
	mutex_unlock(&dev->device_lock);

	free_irq(pdev->irq, dev);
	pci_disable_msi(pdev);

	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;

	pci_enable_msi(pdev);

	/* request and enable interrupt */
	if (pci_dev_msi_enabled(pdev))
	err = request_threaded_irq(pdev->irq,
	NULL,
	mei_interrupt_thread_handler,
	IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
	err = request_threaded_irq(pdev->irq,
	mei_interrupt_quick_handler,
	mei_interrupt_thread_handler,
	IRQF_SHARED, KBUILD_MODNAME, dev);

	if (err) {
	dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
	pdev->irq);
	return err;
	}

	mutex_lock(&dev->device_lock);
	dev->dev_state = MEI_DEV_POWER_UP;
	mei_reset(dev, 1);
	mutex_unlock(&dev->device_lock);

	/* Start timer if stopped in suspend */
	schedule_delayed_work(&dev->timer_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 MEI_PM_OPS NULL
	#endif /* CONFIG_PM */
	/*
	* PCI driver structure
	*/
	static struct pci_driver mei_driver = {
	.name = KBUILD_MODNAME,
	.id_table = mei_pci_tbl,
	.probe = mei_probe,
	.remove = mei_remove,
	.shutdown = mei_remove,
	.driver.pm = MEI_PM_OPS,
	};

	module_pci_driver(mei_driver);

	MODULE_AUTHOR("Intel Corporation");
	MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
	MODULE_LICENSE("GPL v2");