drivers/misc/mei/pci-me.c - kernel/msm-4.19 - 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.
  *
  */
 #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/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/pm_runtime.h>

 #include <linux/mei.h>

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

 /* mei_pci_tbl - PCI Device ID Table */
 static const struct pci_device_id mei_me_pci_tbl[] = {
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82G35, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82G965, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, mei_me_legacy_cfg)},

 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, mei_me_legacy_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, mei_me_ich_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, mei_me_ich_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, mei_me_ich_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, mei_me_ich_cfg)},

 	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, mei_me_pch_cpt_pbg_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, mei_me_pch_cpt_pbg_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, mei_me_lpt_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_lpt_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, mei_me_lpt_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, mei_me_pch_cfg)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, mei_me_pch_cfg)},

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

 MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);

 #ifdef CONFIG_PM_RUNTIME
 static inline void mei_me_set_pm_domain(struct mei_device *dev);
 static inline void mei_me_unset_pm_domain(struct mei_device *dev);
 #else
 static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
 static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
 #endif /* CONFIG_PM_RUNTIME */

 /**
  * mei_quirk_probe - probe for devices that doesn't valid ME interface
  *
  * @pdev: PCI device structure
  * @cfg: per generation config
  *
  * returns true if ME Interface is valid, false otherwise
  */
 static bool mei_me_quirk_probe(struct pci_dev *pdev,
 				const struct mei_cfg *cfg)
 {
 	if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
 		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_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	const struct mei_cfg *cfg = (struct mei_cfg *)(ent->driver_data);
 	struct mei_device *dev;
 	struct mei_me_hw *hw;
 	int err;


 	if (!mei_me_quirk_probe(pdev, cfg))
 		return -ENODEV;

 	/* 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;
 	}

 	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
 	    dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {

 		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 		if (err)
 			err = dma_set_coherent_mask(&pdev->dev,
 						    DMA_BIT_MASK(32));
 	}
 	if (err) {
 		dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
 		goto release_regions;
 	}


 	/* allocates and initializes the mei dev structure */
 	dev = mei_me_dev_init(pdev, cfg);
 	if (!dev) {
 		err = -ENOMEM;
 		goto release_regions;
 	}
 	hw = to_me_hw(dev);
 	/* mapping  IO device memory */
 	hw->mem_addr = pci_iomap(pdev, 0, 0);
 	if (!hw->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_me_irq_thread_handler,
 			IRQF_ONESHOT, KBUILD_MODNAME, dev);
 	else
 		err = request_threaded_irq(pdev->irq,
 			mei_me_irq_quick_handler,
 			mei_me_irq_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_start(dev)) {
 		dev_err(&pdev->dev, "init hw failure.\n");
 		err = -ENODEV;
 		goto release_irq;
 	}

 	pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
 	pm_runtime_use_autosuspend(&pdev->dev);

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

 	pci_set_drvdata(pdev, dev);

 	schedule_delayed_work(&dev->timer_work, HZ);

 	/*
 	* For not wake-able HW runtime pm framework
 	* can't be used on pci device level.
 	* Use domain runtime pm callbacks instead.
 	*/
 	if (!pci_dev_run_wake(pdev))
 		mei_me_set_pm_domain(dev);

 	if (mei_pg_is_enabled(dev))
 		pm_runtime_put_noidle(&pdev->dev);

 	dev_dbg(&pdev->dev, "initialization successful.\n");

 	return 0;

 release_irq:
 	mei_cancel_work(dev);
 	mei_disable_interrupts(dev);
 	free_irq(pdev->irq, dev);
 disable_msi:
 	pci_disable_msi(pdev);
 	pci_iounmap(pdev, hw->mem_addr);
 free_device:
 	kfree(dev);
 release_regions:
 	pci_release_regions(pdev);
 disable_device:
 	pci_disable_device(pdev);
 end:
 	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_me_remove(struct pci_dev *pdev)
 {
 	struct mei_device *dev;
 	struct mei_me_hw *hw;

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

 	if (mei_pg_is_enabled(dev))
 		pm_runtime_get_noresume(&pdev->dev);

 	hw = to_me_hw(dev);


 	dev_dbg(&pdev->dev, "stop\n");
 	mei_stop(dev);

 	if (!pci_dev_run_wake(pdev))
 		mei_me_unset_pm_domain(dev);

 	/* disable interrupts */
 	mei_disable_interrupts(dev);

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

 	if (hw->mem_addr)
 		pci_iounmap(pdev, hw->mem_addr);

 	mei_deregister(dev);

 	kfree(dev);

 	pci_release_regions(pdev);
 	pci_disable_device(pdev);


 }
 #ifdef CONFIG_PM_SLEEP
 static int mei_me_pci_suspend(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev = pci_get_drvdata(pdev);

 	if (!dev)
 		return -ENODEV;

 	dev_dbg(&pdev->dev, "suspend\n");

 	mei_stop(dev);

 	mei_disable_interrupts(dev);

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

 	return 0;
 }

 static int mei_me_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_me_irq_thread_handler,
 			IRQF_ONESHOT, KBUILD_MODNAME, dev);
 	else
 		err = request_threaded_irq(pdev->irq,
 			mei_me_irq_quick_handler,
 			mei_me_irq_thread_handler,
 			IRQF_SHARED, KBUILD_MODNAME, dev);

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

 	err = mei_restart(dev);
 	if (err)
 		return err;

 	/* Start timer if stopped in suspend */
 	schedule_delayed_work(&dev->timer_work, HZ);

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 #ifdef CONFIG_PM_RUNTIME
 static int mei_me_pm_runtime_idle(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev;

 	dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");

 	dev = pci_get_drvdata(pdev);
 	if (!dev)
 		return -ENODEV;
 	if (mei_write_is_idle(dev))
 		pm_runtime_autosuspend(device);

 	return -EBUSY;
 }

 static int mei_me_pm_runtime_suspend(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev;
 	int ret;

 	dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");

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

 	mutex_lock(&dev->device_lock);

 	if (mei_write_is_idle(dev))
 		ret = mei_me_pg_set_sync(dev);
 	else
 		ret = -EAGAIN;

 	mutex_unlock(&dev->device_lock);

 	dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);

 	return ret;
 }

 static int mei_me_pm_runtime_resume(struct device *device)
 {
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct mei_device *dev;
 	int ret;

 	dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");

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

 	mutex_lock(&dev->device_lock);

 	ret = mei_me_pg_unset_sync(dev);

 	mutex_unlock(&dev->device_lock);

 	dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);

 	return ret;
 }

 /**
  * mei_me_set_pm_domain - fill and set pm domian stucture for device
  *
  * @dev: mei_device
  */
 static inline void mei_me_set_pm_domain(struct mei_device *dev)
 {
 	struct pci_dev *pdev  = dev->pdev;

 	if (pdev->dev.bus && pdev->dev.bus->pm) {
 		dev->pg_domain.ops = *pdev->dev.bus->pm;

 		dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
 		dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
 		dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;

 		pdev->dev.pm_domain = &dev->pg_domain;
 	}
 }

 /**
  * mei_me_unset_pm_domain - clean pm domian stucture for device
  *
  * @dev: mei_device
  */
 static inline void mei_me_unset_pm_domain(struct mei_device *dev)
 {
 	/* stop using pm callbacks if any */
 	dev->pdev->dev.pm_domain = NULL;
 }
 #endif /* CONFIG_PM_RUNTIME */

 #ifdef CONFIG_PM
 static const struct dev_pm_ops mei_me_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
 				mei_me_pci_resume)
 	SET_RUNTIME_PM_OPS(
 		mei_me_pm_runtime_suspend,
 		mei_me_pm_runtime_resume,
 		mei_me_pm_runtime_idle)
 };

 #define MEI_ME_PM_OPS	(&mei_me_pm_ops)
 #else
 #define MEI_ME_PM_OPS	NULL
 #endif /* CONFIG_PM */
 /*
  *  PCI driver structure
  */
 static struct pci_driver mei_me_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = mei_me_pci_tbl,
 	.probe = mei_me_probe,
 	.remove = mei_me_remove,
 	.shutdown = mei_me_remove,
 	.driver.pm = MEI_ME_PM_OPS,
 };

 module_pci_driver(mei_me_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.
	*
	*/
	#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/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/pm_runtime.h>

	#include <linux/mei.h>

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

	/* mei_pci_tbl - PCI Device ID Table */
	static const struct pci_device_id mei_me_pci_tbl[] = {
	{MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_82G35, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_82G965, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, mei_me_legacy_cfg)},

	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, mei_me_legacy_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, mei_me_ich_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, mei_me_ich_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, mei_me_ich_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, mei_me_ich_cfg)},

	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, mei_me_pch_cpt_pbg_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, mei_me_pch_cpt_pbg_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, mei_me_lpt_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_lpt_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, mei_me_lpt_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, mei_me_pch_cfg)},
	{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, mei_me_pch_cfg)},

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

	MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);

	#ifdef CONFIG_PM_RUNTIME
	static inline void mei_me_set_pm_domain(struct mei_device *dev);
	static inline void mei_me_unset_pm_domain(struct mei_device *dev);
	#else
	static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
	static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
	#endif /* CONFIG_PM_RUNTIME */

	/**
	* mei_quirk_probe - probe for devices that doesn't valid ME interface
	*
	* @pdev: PCI device structure
	* @cfg: per generation config
	*
	* returns true if ME Interface is valid, false otherwise
	*/
	static bool mei_me_quirk_probe(struct pci_dev *pdev,
	const struct mei_cfg *cfg)
	{
	if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
	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_me_probe(struct pci_dev pdev, const struct pci_device_id ent)
	{
	const struct mei_cfg cfg = (struct mei_cfg )(ent->driver_data);
	struct mei_device *dev;
	struct mei_me_hw *hw;
	int err;


	if (!mei_me_quirk_probe(pdev, cfg))
	return -ENODEV;

	/* 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;
	}

	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) \|\|
	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {

	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (err)
	err = dma_set_coherent_mask(&pdev->dev,
	DMA_BIT_MASK(32));
	}
	if (err) {
	dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
	goto release_regions;
	}


	/* allocates and initializes the mei dev structure */
	dev = mei_me_dev_init(pdev, cfg);
	if (!dev) {
	err = -ENOMEM;
	goto release_regions;
	}
	hw = to_me_hw(dev);
	/* mapping IO device memory */
	hw->mem_addr = pci_iomap(pdev, 0, 0);
	if (!hw->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_me_irq_thread_handler,
	IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
	err = request_threaded_irq(pdev->irq,
	mei_me_irq_quick_handler,
	mei_me_irq_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_start(dev)) {
	dev_err(&pdev->dev, "init hw failure.\n");
	err = -ENODEV;
	goto release_irq;
	}

	pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
	pm_runtime_use_autosuspend(&pdev->dev);

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

	pci_set_drvdata(pdev, dev);

	schedule_delayed_work(&dev->timer_work, HZ);

	/*
	* For not wake-able HW runtime pm framework
	* can't be used on pci device level.
	* Use domain runtime pm callbacks instead.
	*/
	if (!pci_dev_run_wake(pdev))
	mei_me_set_pm_domain(dev);

	if (mei_pg_is_enabled(dev))
	pm_runtime_put_noidle(&pdev->dev);

	dev_dbg(&pdev->dev, "initialization successful.\n");

	return 0;

	release_irq:
	mei_cancel_work(dev);
	mei_disable_interrupts(dev);
	free_irq(pdev->irq, dev);
	disable_msi:
	pci_disable_msi(pdev);
	pci_iounmap(pdev, hw->mem_addr);
	free_device:
	kfree(dev);
	release_regions:
	pci_release_regions(pdev);
	disable_device:
	pci_disable_device(pdev);
	end:
	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_me_remove(struct pci_dev *pdev)
	{
	struct mei_device *dev;
	struct mei_me_hw *hw;

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

	if (mei_pg_is_enabled(dev))
	pm_runtime_get_noresume(&pdev->dev);

	hw = to_me_hw(dev);


	dev_dbg(&pdev->dev, "stop\n");
	mei_stop(dev);

	if (!pci_dev_run_wake(pdev))
	mei_me_unset_pm_domain(dev);

	/* disable interrupts */
	mei_disable_interrupts(dev);

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

	if (hw->mem_addr)
	pci_iounmap(pdev, hw->mem_addr);

	mei_deregister(dev);

	kfree(dev);

	pci_release_regions(pdev);
	pci_disable_device(pdev);


	}
	#ifdef CONFIG_PM_SLEEP
	static int mei_me_pci_suspend(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev = pci_get_drvdata(pdev);

	if (!dev)
	return -ENODEV;

	dev_dbg(&pdev->dev, "suspend\n");

	mei_stop(dev);

	mei_disable_interrupts(dev);

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

	return 0;
	}

	static int mei_me_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_me_irq_thread_handler,
	IRQF_ONESHOT, KBUILD_MODNAME, dev);
	else
	err = request_threaded_irq(pdev->irq,
	mei_me_irq_quick_handler,
	mei_me_irq_thread_handler,
	IRQF_SHARED, KBUILD_MODNAME, dev);

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

	err = mei_restart(dev);
	if (err)
	return err;

	/* Start timer if stopped in suspend */
	schedule_delayed_work(&dev->timer_work, HZ);

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	#ifdef CONFIG_PM_RUNTIME
	static int mei_me_pm_runtime_idle(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;

	dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");

	dev = pci_get_drvdata(pdev);
	if (!dev)
	return -ENODEV;
	if (mei_write_is_idle(dev))
	pm_runtime_autosuspend(device);

	return -EBUSY;
	}

	static int mei_me_pm_runtime_suspend(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;
	int ret;

	dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");

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

	mutex_lock(&dev->device_lock);

	if (mei_write_is_idle(dev))
	ret = mei_me_pg_set_sync(dev);
	else
	ret = -EAGAIN;

	mutex_unlock(&dev->device_lock);

	dev_dbg(&pdev->dev, "rpm: me: runtime suspend ret=%d\n", ret);

	return ret;
	}

	static int mei_me_pm_runtime_resume(struct device *device)
	{
	struct pci_dev *pdev = to_pci_dev(device);
	struct mei_device *dev;
	int ret;

	dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");

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

	mutex_lock(&dev->device_lock);

	ret = mei_me_pg_unset_sync(dev);

	mutex_unlock(&dev->device_lock);

	dev_dbg(&pdev->dev, "rpm: me: runtime resume ret = %d\n", ret);

	return ret;
	}

	/**
	* mei_me_set_pm_domain - fill and set pm domian stucture for device
	*
	* @dev: mei_device
	*/
	static inline void mei_me_set_pm_domain(struct mei_device *dev)
	{
	struct pci_dev *pdev = dev->pdev;

	if (pdev->dev.bus && pdev->dev.bus->pm) {
	dev->pg_domain.ops = *pdev->dev.bus->pm;

	dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
	dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
	dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;

	pdev->dev.pm_domain = &dev->pg_domain;
	}
	}

	/**
	* mei_me_unset_pm_domain - clean pm domian stucture for device
	*
	* @dev: mei_device
	*/
	static inline void mei_me_unset_pm_domain(struct mei_device *dev)
	{
	/* stop using pm callbacks if any */
	dev->pdev->dev.pm_domain = NULL;
	}
	#endif /* CONFIG_PM_RUNTIME */

	#ifdef CONFIG_PM
	static const struct dev_pm_ops mei_me_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
	mei_me_pci_resume)
	SET_RUNTIME_PM_OPS(
	mei_me_pm_runtime_suspend,
	mei_me_pm_runtime_resume,
	mei_me_pm_runtime_idle)
	};

	#define MEI_ME_PM_OPS (&mei_me_pm_ops)
	#else
	#define MEI_ME_PM_OPS NULL
	#endif /* CONFIG_PM */
	/*
	* PCI driver structure
	*/
	static struct pci_driver mei_me_driver = {
	.name = KBUILD_MODNAME,
	.id_table = mei_me_pci_tbl,
	.probe = mei_me_probe,
	.remove = mei_me_remove,
	.shutdown = mei_me_remove,
	.driver.pm = MEI_ME_PM_OPS,
	};

	module_pci_driver(mei_me_driver);

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