drivers/pci/hotplug/pciehp_core.c - maze/linux - Git at Google

 /*
  * PCI Express Hot Plug Controller Driver
  *
  * Copyright (C) 1995,2001 Compaq Computer Corporation
  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  * Copyright (C) 2001 IBM Corp.
  * Copyright (C) 2003-2004 Intel Corporation
  *
  * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or (at
  * your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  * NON INFRINGEMENT.  See the GNU General Public License for more
  * details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  *
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/pci.h>
 #include "pciehp.h"
 #include <linux/interrupt.h>
 #include <linux/time.h>

 /* Global variables */
 int pciehp_debug;
 int pciehp_poll_mode;
 int pciehp_poll_time;
 int pciehp_force;
 struct workqueue_struct *pciehp_wq;

 #define DRIVER_VERSION	"0.4"
 #define DRIVER_AUTHOR	"Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
 #define DRIVER_DESC	"PCI Express Hot Plug Controller Driver"

 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");

 module_param(pciehp_debug, bool, 0644);
 module_param(pciehp_poll_mode, bool, 0644);
 module_param(pciehp_poll_time, int, 0644);
 module_param(pciehp_force, bool, 0644);
 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");

 #define PCIE_MODULE_NAME "pciehp"

 static int set_attention_status (struct hotplug_slot *slot, u8 value);
 static int enable_slot		(struct hotplug_slot *slot);
 static int disable_slot		(struct hotplug_slot *slot);
 static int get_power_status	(struct hotplug_slot *slot, u8 *value);
 static int get_attention_status	(struct hotplug_slot *slot, u8 *value);
 static int get_latch_status	(struct hotplug_slot *slot, u8 *value);
 static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);
 static int get_address		(struct hotplug_slot *slot, u32 *value);
 static int get_max_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);
 static int get_cur_bus_speed	(struct hotplug_slot *slot, enum pci_bus_speed *value);

 static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
 	.owner =		THIS_MODULE,
 	.set_attention_status =	set_attention_status,
 	.enable_slot =		enable_slot,
 	.disable_slot =		disable_slot,
 	.get_power_status =	get_power_status,
 	.get_attention_status =	get_attention_status,
 	.get_latch_status =	get_latch_status,
 	.get_adapter_status =	get_adapter_status,
 	.get_address =		get_address,
   	.get_max_bus_speed =	get_max_bus_speed,
   	.get_cur_bus_speed =	get_cur_bus_speed,
 };

 /*
  * Check the status of the Electro Mechanical Interlock (EMI)
  */
 static int get_lock_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	return (slot->hpc_ops->get_emi_status(slot, value));
 }

 /*
  * sysfs interface for the Electro Mechanical Interlock (EMI)
  * 1 == locked, 0 == unlocked
  */
 static ssize_t lock_read_file(struct hotplug_slot *slot, char *buf)
 {
 	int retval;
 	u8 value;

 	retval = get_lock_status(slot, &value);
 	if (retval)
 		goto lock_read_exit;
 	retval = sprintf (buf, "%d\n", value);

 lock_read_exit:
 	return retval;
 }

 /*
  * Change the status of the Electro Mechanical Interlock (EMI)
  * This is a toggle - in addition there must be at least 1 second
  * in between toggles.
  */
 static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;
 	u8 value;

 	mutex_lock(&slot->ctrl->crit_sect);

 	/* has it been >1 sec since our last toggle? */
 	if ((get_seconds() - slot->last_emi_toggle) < 1)
 		return -EINVAL;

 	/* see what our current state is */
 	retval = get_lock_status(hotplug_slot, &value);
 	if (retval || (value == status))
 		goto set_lock_exit;

 	slot->hpc_ops->toggle_emi(slot);
 set_lock_exit:
 	mutex_unlock(&slot->ctrl->crit_sect);
 	return 0;
 }

 /*
  * sysfs interface which allows the user to toggle the Electro Mechanical
  * Interlock.  Valid values are either 0 or 1.  0 == unlock, 1 == lock
  */
 static ssize_t lock_write_file(struct hotplug_slot *slot, const char *buf,
 		size_t count)
 {
 	unsigned long llock;
 	u8 lock;
 	int retval = 0;

 	llock = simple_strtoul(buf, NULL, 10);
 	lock = (u8)(llock & 0xff);

 	switch (lock) {
 		case 0:
 		case 1:
 			retval = set_lock_status(slot, lock);
 			break;
 		default:
 			err ("%d is an invalid lock value\n", lock);
 			retval = -EINVAL;
 	}
 	if (retval)
 		return retval;
 	return count;
 }

 static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
 	.attr = {.name = "lock", .mode = S_IFREG | S_IRUGO | S_IWUSR},
 	.show = lock_read_file,
 	.store = lock_write_file
 };

 /**
  * release_slot - free up the memory used by a slot
  * @hotplug_slot: slot to free
  */
 static void release_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = hotplug_slot->private;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	kfree(slot->hotplug_slot->info);
 	kfree(slot->hotplug_slot);
 	kfree(slot);
 }

 static void make_slot_name(struct slot *slot)
 {
 	snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
 		 slot->bus, slot->number);
 }

 static int init_slots(struct controller *ctrl)
 {
 	struct slot *slot;
 	struct hotplug_slot *hotplug_slot;
 	struct hotplug_slot_info *info;
 	int retval = -ENOMEM;
 	int i;

 	for (i = 0; i < ctrl->num_slots; i++) {
 		slot = kzalloc(sizeof(*slot), GFP_KERNEL);
 		if (!slot)
 			goto error;

 		hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
 		if (!hotplug_slot)
 			goto error_slot;
 		slot->hotplug_slot = hotplug_slot;

 		info = kzalloc(sizeof(*info), GFP_KERNEL);
 		if (!info)
 			goto error_hpslot;
 		hotplug_slot->info = info;

 		hotplug_slot->name = slot->name;

 		slot->hp_slot = i;
 		slot->ctrl = ctrl;
 		slot->bus = ctrl->pci_dev->subordinate->number;
 		slot->device = ctrl->slot_device_offset + i;
 		slot->hpc_ops = ctrl->hpc_ops;
 		slot->number = ctrl->first_slot;
 		mutex_init(&slot->lock);
 		INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);

 		/* register this slot with the hotplug pci core */
 		hotplug_slot->private = slot;
 		hotplug_slot->release = &release_slot;
 		make_slot_name(slot);
 		hotplug_slot->ops = &pciehp_hotplug_slot_ops;

 		get_power_status(hotplug_slot, &info->power_status);
 		get_attention_status(hotplug_slot, &info->attention_status);
 		get_latch_status(hotplug_slot, &info->latch_status);
 		get_adapter_status(hotplug_slot, &info->adapter_status);

 		dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
 		    "slot_device_offset=%x\n", slot->bus, slot->device,
 		    slot->hp_slot, slot->number, ctrl->slot_device_offset);
 		retval = pci_hp_register(hotplug_slot);
 		if (retval) {
 			err ("pci_hp_register failed with error %d\n", retval);
 			goto error_info;
 		}
 		/* create additional sysfs entries */
 		if (EMI(ctrl->ctrlcap)) {
 			retval = sysfs_create_file(&hotplug_slot->kobj,
 				&hotplug_slot_attr_lock.attr);
 			if (retval) {
 				pci_hp_deregister(hotplug_slot);
 				err("cannot create additional sysfs entries\n");
 				goto error_info;
 			}
 		}

 		list_add(&slot->slot_list, &ctrl->slot_list);
 	}

 	return 0;
 error_info:
 	kfree(info);
 error_hpslot:
 	kfree(hotplug_slot);
 error_slot:
 	kfree(slot);
 error:
 	return retval;
 }

 static void cleanup_slots(struct controller *ctrl)
 {
 	struct list_head *tmp;
 	struct list_head *next;
 	struct slot *slot;

 	list_for_each_safe(tmp, next, &ctrl->slot_list) {
 		slot = list_entry(tmp, struct slot, slot_list);
 		list_del(&slot->slot_list);
 		if (EMI(ctrl->ctrlcap))
 			sysfs_remove_file(&slot->hotplug_slot->kobj,
 				&hotplug_slot_attr_lock.attr);
 		cancel_delayed_work(&slot->work);
 		flush_scheduled_work();
 		flush_workqueue(pciehp_wq);
 		pci_hp_deregister(slot->hotplug_slot);
 	}
 }

 /*
  * set_attention_status - Turns the Amber LED for a slot on, off or blink
  */
 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 {
 	struct slot *slot = hotplug_slot->private;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	hotplug_slot->info->attention_status = status;

 	if (ATTN_LED(slot->ctrl->ctrlcap))
 		slot->hpc_ops->set_attention_status(slot, status);

 	return 0;
 }


 static int enable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = hotplug_slot->private;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	return pciehp_sysfs_enable_slot(slot);
 }


 static int disable_slot(struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = hotplug_slot->private;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	return pciehp_sysfs_disable_slot(slot);
 }

 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_power_status(slot, value);
 	if (retval < 0)
 		*value = hotplug_slot->info->power_status;

 	return 0;
 }

 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_attention_status(slot, value);
 	if (retval < 0)
 		*value = hotplug_slot->info->attention_status;

 	return 0;
 }

 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_latch_status(slot, value);
 	if (retval < 0)
 		*value = hotplug_slot->info->latch_status;

 	return 0;
 }

 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_adapter_status(slot, value);
 	if (retval < 0)
 		*value = hotplug_slot->info->adapter_status;

 	return 0;
 }

 static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	*value = (pci_domain_nr(bus) << 16) | (slot->bus << 8) | slot->device;

 	return 0;
 }

 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
 	if (retval < 0)
 		*value = PCI_SPEED_UNKNOWN;

 	return 0;
 }

 static int get_cur_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value)
 {
 	struct slot *slot = hotplug_slot->private;
 	int retval;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

 	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
 	if (retval < 0)
 		*value = PCI_SPEED_UNKNOWN;

 	return 0;
 }

 static int pciehp_probe(struct pcie_device *dev, const struct pcie_port_service_id *id)
 {
 	int rc;
 	struct controller *ctrl;
 	struct slot *t_slot;
 	u8 value;
 	struct pci_dev *pdev;

 	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl) {
 		err("%s : out of memory\n", __FUNCTION__);
 		goto err_out_none;
 	}
 	INIT_LIST_HEAD(&ctrl->slot_list);

 	pdev = dev->port;
 	ctrl->pci_dev = pdev;

 	rc = pcie_init(ctrl, dev);
 	if (rc) {
 		dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
 		goto err_out_free_ctrl;
 	}

 	pci_set_drvdata(pdev, ctrl);

 	ctrl->bus = pdev->bus->number;  /* ctrl bus */
 	ctrl->slot_bus = pdev->subordinate->number;  /* bus controlled by this HPC */

 	ctrl->device = PCI_SLOT(pdev->devfn);
 	ctrl->function = PCI_FUNC(pdev->devfn);
 	dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
 		ctrl->bus, ctrl->device, ctrl->function, pdev->irq);

 	/* Setup the slot information structures */
 	rc = init_slots(ctrl);
 	if (rc) {
 		err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
 		goto err_out_release_ctlr;
 	}

 	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);

 	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
 	if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
 		rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
 		if (rc)
 			goto err_out_free_ctrl_slot;
 	}

 	return 0;

 err_out_free_ctrl_slot:
 	cleanup_slots(ctrl);
 err_out_release_ctlr:
 	ctrl->hpc_ops->release_ctlr(ctrl);
 err_out_free_ctrl:
 	kfree(ctrl);
 err_out_none:
 	return -ENODEV;
 }

 static void pciehp_remove (struct pcie_device *dev)
 {
 	struct pci_dev *pdev = dev->port;
 	struct controller *ctrl = pci_get_drvdata(pdev);

 	cleanup_slots(ctrl);
 	ctrl->hpc_ops->release_ctlr(ctrl);
 	kfree(ctrl);
 }

 #ifdef CONFIG_PM
 static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
 {
 	printk("%s ENTRY\n", __FUNCTION__);
 	return 0;
 }

 static int pciehp_resume (struct pcie_device *dev)
 {
 	printk("%s ENTRY\n", __FUNCTION__);
 	return 0;
 }
 #endif

 static struct pcie_port_service_id port_pci_ids[] = { {
 	.vendor = PCI_ANY_ID,
 	.device = PCI_ANY_ID,
 	.port_type = PCIE_ANY_PORT,
 	.service_type = PCIE_PORT_SERVICE_HP,
 	.driver_data =	0,
 	}, { /* end: all zeroes */ }
 };
 static const char device_name[] = "hpdriver";

 static struct pcie_port_service_driver hpdriver_portdrv = {
 	.name		= (char *)device_name,
 	.id_table	= &port_pci_ids[0],

 	.probe		= pciehp_probe,
 	.remove		= pciehp_remove,

 #ifdef	CONFIG_PM
 	.suspend	= pciehp_suspend,
 	.resume		= pciehp_resume,
 #endif	/* PM */
 };

 static int __init pcied_init(void)
 {
 	int retval = 0;

 #ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
 	pciehp_poll_mode = 1;
 #endif

 	retval = pcie_port_service_register(&hpdriver_portdrv);
  	dbg("pcie_port_service_register = %d\n", retval);
   	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
  	if (retval)
 		dbg("%s: Failure to register service\n", __FUNCTION__);
 	return retval;
 }

 static void __exit pcied_cleanup(void)
 {
 	dbg("unload_pciehpd()\n");
 	pcie_port_service_unregister(&hpdriver_portdrv);
 	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 }

 module_init(pcied_init);
 module_exit(pcied_cleanup);
	/*
	* PCI Express Hot Plug Controller Driver
	*
	* Copyright (C) 1995,2001 Compaq Computer Corporation
	* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
	* Copyright (C) 2001 IBM Corp.
	* Copyright (C) 2003-2004 Intel Corporation
	*
	* All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	* NON INFRINGEMENT. See the GNU General Public License for more
	* details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
	*
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/pci.h>
	#include "pciehp.h"
	#include <linux/interrupt.h>
	#include <linux/time.h>

	/* Global variables */
	int pciehp_debug;
	int pciehp_poll_mode;
	int pciehp_poll_time;
	int pciehp_force;
	struct workqueue_struct *pciehp_wq;

	#define DRIVER_VERSION "0.4"
	#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
	#define DRIVER_DESC "PCI Express Hot Plug Controller Driver"

	MODULE_AUTHOR(DRIVER_AUTHOR);
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");

	module_param(pciehp_debug, bool, 0644);
	module_param(pciehp_poll_mode, bool, 0644);
	module_param(pciehp_poll_time, int, 0644);
	module_param(pciehp_force, bool, 0644);
	MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
	MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
	MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
	MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");

	#define PCIE_MODULE_NAME "pciehp"

	static int set_attention_status (struct hotplug_slot *slot, u8 value);
	static int enable_slot (struct hotplug_slot *slot);
	static int disable_slot (struct hotplug_slot *slot);
	static int get_power_status (struct hotplug_slot slot, u8 value);
	static int get_attention_status (struct hotplug_slot slot, u8 value);
	static int get_latch_status (struct hotplug_slot slot, u8 value);
	static int get_adapter_status (struct hotplug_slot slot, u8 value);
	static int get_address (struct hotplug_slot slot, u32 value);
	static int get_max_bus_speed (struct hotplug_slot slot, enum pci_bus_speed value);
	static int get_cur_bus_speed (struct hotplug_slot slot, enum pci_bus_speed value);

	static struct hotplug_slot_ops pciehp_hotplug_slot_ops = {
	.owner = THIS_MODULE,
	.set_attention_status = set_attention_status,
	.enable_slot = enable_slot,
	.disable_slot = disable_slot,
	.get_power_status = get_power_status,
	.get_attention_status = get_attention_status,
	.get_latch_status = get_latch_status,
	.get_adapter_status = get_adapter_status,
	.get_address = get_address,
	.get_max_bus_speed = get_max_bus_speed,
	.get_cur_bus_speed = get_cur_bus_speed,
	};

	/*
	* Check the status of the Electro Mechanical Interlock (EMI)
	*/
	static int get_lock_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot *slot = hotplug_slot->private;
	return (slot->hpc_ops->get_emi_status(slot, value));
	}

	/*
	* sysfs interface for the Electro Mechanical Interlock (EMI)
	* 1 == locked, 0 == unlocked
	*/
	static ssize_t lock_read_file(struct hotplug_slot slot, char buf)
	{
	int retval;
	u8 value;

	retval = get_lock_status(slot, &value);
	if (retval)
	goto lock_read_exit;
	retval = sprintf (buf, "%d\n", value);

	lock_read_exit:
	return retval;
	}

	/*
	* Change the status of the Electro Mechanical Interlock (EMI)
	* This is a toggle - in addition there must be at least 1 second
	* in between toggles.
	*/
	static int set_lock_status(struct hotplug_slot *hotplug_slot, u8 status)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;
	u8 value;

	mutex_lock(&slot->ctrl->crit_sect);

	/* has it been >1 sec since our last toggle? */
	if ((get_seconds() - slot->last_emi_toggle) < 1)
	return -EINVAL;

	/* see what our current state is */
	retval = get_lock_status(hotplug_slot, &value);
	if (retval \|\| (value == status))
	goto set_lock_exit;

	slot->hpc_ops->toggle_emi(slot);
	set_lock_exit:
	mutex_unlock(&slot->ctrl->crit_sect);
	return 0;
	}

	/*
	* sysfs interface which allows the user to toggle the Electro Mechanical
	* Interlock. Valid values are either 0 or 1. 0 == unlock, 1 == lock
	*/
	static ssize_t lock_write_file(struct hotplug_slot slot, const char buf,
	size_t count)
	{
	unsigned long llock;
	u8 lock;
	int retval = 0;

	llock = simple_strtoul(buf, NULL, 10);
	lock = (u8)(llock & 0xff);

	switch (lock) {
	case 0:
	case 1:
	retval = set_lock_status(slot, lock);
	break;
	default:
	err ("%d is an invalid lock value\n", lock);
	retval = -EINVAL;
	}
	if (retval)
	return retval;
	return count;
	}

	static struct hotplug_slot_attribute hotplug_slot_attr_lock = {
	.attr = {.name = "lock", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	.show = lock_read_file,
	.store = lock_write_file
	};

	/**
	* release_slot - free up the memory used by a slot
	* @hotplug_slot: slot to free
	*/
	static void release_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot);
	kfree(slot);
	}

	static void make_slot_name(struct slot *slot)
	{
	snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%04d_%04d",
	slot->bus, slot->number);
	}

	static int init_slots(struct controller *ctrl)
	{
	struct slot *slot;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
	int retval = -ENOMEM;
	int i;

	for (i = 0; i < ctrl->num_slots; i++) {
	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot)
	goto error;

	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
	if (!hotplug_slot)
	goto error_slot;
	slot->hotplug_slot = hotplug_slot;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
	goto error_hpslot;
	hotplug_slot->info = info;

	hotplug_slot->name = slot->name;

	slot->hp_slot = i;
	slot->ctrl = ctrl;
	slot->bus = ctrl->pci_dev->subordinate->number;
	slot->device = ctrl->slot_device_offset + i;
	slot->hpc_ops = ctrl->hpc_ops;
	slot->number = ctrl->first_slot;
	mutex_init(&slot->lock);
	INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);

	/* register this slot with the hotplug pci core */
	hotplug_slot->private = slot;
	hotplug_slot->release = &release_slot;
	make_slot_name(slot);
	hotplug_slot->ops = &pciehp_hotplug_slot_ops;

	get_power_status(hotplug_slot, &info->power_status);
	get_attention_status(hotplug_slot, &info->attention_status);
	get_latch_status(hotplug_slot, &info->latch_status);
	get_adapter_status(hotplug_slot, &info->adapter_status);

	dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
	"slot_device_offset=%x\n", slot->bus, slot->device,
	slot->hp_slot, slot->number, ctrl->slot_device_offset);
	retval = pci_hp_register(hotplug_slot);
	if (retval) {
	err ("pci_hp_register failed with error %d\n", retval);
	goto error_info;
	}
	/* create additional sysfs entries */
	if (EMI(ctrl->ctrlcap)) {
	retval = sysfs_create_file(&hotplug_slot->kobj,
	&hotplug_slot_attr_lock.attr);
	if (retval) {
	pci_hp_deregister(hotplug_slot);
	err("cannot create additional sysfs entries\n");
	goto error_info;
	}
	}

	list_add(&slot->slot_list, &ctrl->slot_list);
	}

	return 0;
	error_info:
	kfree(info);
	error_hpslot:
	kfree(hotplug_slot);
	error_slot:
	kfree(slot);
	error:
	return retval;
	}

	static void cleanup_slots(struct controller *ctrl)
	{
	struct list_head *tmp;
	struct list_head *next;
	struct slot *slot;

	list_for_each_safe(tmp, next, &ctrl->slot_list) {
	slot = list_entry(tmp, struct slot, slot_list);
	list_del(&slot->slot_list);
	if (EMI(ctrl->ctrlcap))
	sysfs_remove_file(&slot->hotplug_slot->kobj,
	&hotplug_slot_attr_lock.attr);
	cancel_delayed_work(&slot->work);
	flush_scheduled_work();
	flush_workqueue(pciehp_wq);
	pci_hp_deregister(slot->hotplug_slot);
	}
	}

	/*
	* set_attention_status - Turns the Amber LED for a slot on, off or blink
	*/
	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
	{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	hotplug_slot->info->attention_status = status;

	if (ATTN_LED(slot->ctrl->ctrlcap))
	slot->hpc_ops->set_attention_status(slot, status);

	return 0;
	}


	static int enable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_sysfs_enable_slot(slot);
	}


	static int disable_slot(struct hotplug_slot *hotplug_slot)
	{
	struct slot *slot = hotplug_slot->private;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	return pciehp_sysfs_disable_slot(slot);
	}

	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_power_status(slot, value);
	if (retval < 0)
	*value = hotplug_slot->info->power_status;

	return 0;
	}

	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_attention_status(slot, value);
	if (retval < 0)
	*value = hotplug_slot->info->attention_status;

	return 0;
	}

	static int get_latch_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_latch_status(slot, value);
	if (retval < 0)
	*value = hotplug_slot->info->latch_status;

	return 0;
	}

	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_adapter_status(slot, value);
	if (retval < 0)
	*value = hotplug_slot->info->adapter_status;

	return 0;
	}

	static int get_address(struct hotplug_slot hotplug_slot, u32 value)
	{
	struct slot *slot = hotplug_slot->private;
	struct pci_bus *bus = slot->ctrl->pci_dev->subordinate;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	*value = (pci_domain_nr(bus) << 16) \| (slot->bus << 8) \| slot->device;

	return 0;
	}

	static int get_max_bus_speed(struct hotplug_slot hotplug_slot, enum pci_bus_speed value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_max_bus_speed(slot, value);
	if (retval < 0)
	*value = PCI_SPEED_UNKNOWN;

	return 0;
	}

	static int get_cur_bus_speed(struct hotplug_slot hotplug_slot, enum pci_bus_speed value)
	{
	struct slot *slot = hotplug_slot->private;
	int retval;

	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);

	retval = slot->hpc_ops->get_cur_bus_speed(slot, value);
	if (retval < 0)
	*value = PCI_SPEED_UNKNOWN;

	return 0;
	}

	static int pciehp_probe(struct pcie_device dev, const struct pcie_port_service_id id)
	{
	int rc;
	struct controller *ctrl;
	struct slot *t_slot;
	u8 value;
	struct pci_dev *pdev;

	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl) {
	err("%s : out of memory\n", __FUNCTION__);
	goto err_out_none;
	}
	INIT_LIST_HEAD(&ctrl->slot_list);

	pdev = dev->port;
	ctrl->pci_dev = pdev;

	rc = pcie_init(ctrl, dev);
	if (rc) {
	dbg("%s: controller initialization failed\n", PCIE_MODULE_NAME);
	goto err_out_free_ctrl;
	}

	pci_set_drvdata(pdev, ctrl);

	ctrl->bus = pdev->bus->number; /* ctrl bus */
	ctrl->slot_bus = pdev->subordinate->number; /* bus controlled by this HPC */

	ctrl->device = PCI_SLOT(pdev->devfn);
	ctrl->function = PCI_FUNC(pdev->devfn);
	dbg("%s: ctrl bus=0x%x, device=%x, function=%x, irq=%x\n", __FUNCTION__,
	ctrl->bus, ctrl->device, ctrl->function, pdev->irq);

	/* Setup the slot information structures */
	rc = init_slots(ctrl);
	if (rc) {
	err("%s: slot initialization failed\n", PCIE_MODULE_NAME);
	goto err_out_release_ctlr;
	}

	t_slot = pciehp_find_slot(ctrl, ctrl->slot_device_offset);

	t_slot->hpc_ops->get_adapter_status(t_slot, &value); /* Check if slot is occupied */
	if ((POWER_CTRL(ctrl->ctrlcap)) && !value) {
	rc = t_slot->hpc_ops->power_off_slot(t_slot); /* Power off slot if not occupied*/
	if (rc)
	goto err_out_free_ctrl_slot;
	}

	return 0;

	err_out_free_ctrl_slot:
	cleanup_slots(ctrl);
	err_out_release_ctlr:
	ctrl->hpc_ops->release_ctlr(ctrl);
	err_out_free_ctrl:
	kfree(ctrl);
	err_out_none:
	return -ENODEV;
	}

	static void pciehp_remove (struct pcie_device *dev)
	{
	struct pci_dev *pdev = dev->port;
	struct controller *ctrl = pci_get_drvdata(pdev);

	cleanup_slots(ctrl);
	ctrl->hpc_ops->release_ctlr(ctrl);
	kfree(ctrl);
	}

	#ifdef CONFIG_PM
	static int pciehp_suspend (struct pcie_device *dev, pm_message_t state)
	{
	printk("%s ENTRY\n", __FUNCTION__);
	return 0;
	}

	static int pciehp_resume (struct pcie_device *dev)
	{
	printk("%s ENTRY\n", __FUNCTION__);
	return 0;
	}
	#endif

	static struct pcie_port_service_id port_pci_ids[] = { {
	.vendor = PCI_ANY_ID,
	.device = PCI_ANY_ID,
	.port_type = PCIE_ANY_PORT,
	.service_type = PCIE_PORT_SERVICE_HP,
	.driver_data = 0,
	}, { /* end: all zeroes */ }
	};
	static const char device_name[] = "hpdriver";

	static struct pcie_port_service_driver hpdriver_portdrv = {
	.name = (char *)device_name,
	.id_table = &port_pci_ids[0],

	.probe = pciehp_probe,
	.remove = pciehp_remove,

	#ifdef CONFIG_PM
	.suspend = pciehp_suspend,
	.resume = pciehp_resume,
	#endif /* PM */
	};

	static int __init pcied_init(void)
	{
	int retval = 0;

	#ifdef CONFIG_HOTPLUG_PCI_PCIE_POLL_EVENT_MODE
	pciehp_poll_mode = 1;
	#endif

	retval = pcie_port_service_register(&hpdriver_portdrv);
	dbg("pcie_port_service_register = %d\n", retval);
	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	if (retval)
	dbg("%s: Failure to register service\n", __FUNCTION__);
	return retval;
	}

	static void __exit pcied_cleanup(void)
	{
	dbg("unload_pciehpd()\n");
	pcie_port_service_unregister(&hpdriver_portdrv);
	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
	}

	module_init(pcied_init);
	module_exit(pcied_cleanup);