drivers/pci/hotplug/pciehp_ctrl.c - third_party/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/kernel.h>
 #include <linux/types.h>
 #include <linux/smp_lock.h>
 #include <linux/pci.h>
 #include <linux/workqueue.h>
 #include "../pci.h"
 #include "pciehp.h"

 static void interrupt_event_handler(struct work_struct *work);

 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
 {
 	struct event_info *info;

 	info = kmalloc(sizeof(*info), GFP_ATOMIC);
 	if (!info)
 		return -ENOMEM;

 	info->event_type = event_type;
 	info->p_slot = p_slot;
 	INIT_WORK(&info->work, interrupt_event_handler);

 	schedule_work(&info->work);

 	return 0;
 }

 u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
 {
 	struct slot *p_slot;
 	u32 event_type;

 	/* Attention Button Change */
 	dbg("pciehp:  Attention button interrupt received.\n");

 	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

 	/*
 	 *  Button pressed - See if need to TAKE ACTION!!!
 	 */
 	info("Button pressed on Slot(%s)\n", p_slot->name);
 	event_type = INT_BUTTON_PRESS;

 	queue_interrupt_event(p_slot, event_type);

 	return 0;
 }

 u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
 {
 	struct slot *p_slot;
 	u8 getstatus;
 	u32 event_type;

 	/* Switch Change */
 	dbg("pciehp:  Switch interrupt received.\n");

 	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

 	if (getstatus) {
 		/*
 		 * Switch opened
 		 */
 		info("Latch open on Slot(%s)\n", p_slot->name);
 		event_type = INT_SWITCH_OPEN;
 	} else {
 		/*
 		 *  Switch closed
 		 */
 		info("Latch close on Slot(%s)\n", p_slot->name);
 		event_type = INT_SWITCH_CLOSE;
 	}

 	queue_interrupt_event(p_slot, event_type);

 	return 1;
 }

 u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 {
 	struct slot *p_slot;
 	u32 event_type;
 	u8 presence_save;

 	/* Presence Change */
 	dbg("pciehp:  Presence/Notify input change.\n");

 	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

 	/* Switch is open, assume a presence change
 	 * Save the presence state
 	 */
 	p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 	if (presence_save) {
 		/*
 		 * Card Present
 		 */
 		info("Card present on Slot(%s)\n", p_slot->name);
 		event_type = INT_PRESENCE_ON;
 	} else {
 		/*
 		 * Not Present
 		 */
 		info("Card not present on Slot(%s)\n", p_slot->name);
 		event_type = INT_PRESENCE_OFF;
 	}

 	queue_interrupt_event(p_slot, event_type);

 	return 1;
 }

 u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 {
 	struct slot *p_slot;
 	u32 event_type;

 	/* power fault */
 	dbg("pciehp:  Power fault interrupt received.\n");

 	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

 	if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 		/*
 		 * power fault Cleared
 		 */
 		info("Power fault cleared on Slot(%s)\n", p_slot->name);
 		event_type = INT_POWER_FAULT_CLEAR;
 	} else {
 		/*
 		 *   power fault
 		 */
 		info("Power fault on Slot(%s)\n", p_slot->name);
 		event_type = INT_POWER_FAULT;
 		info("power fault bit %x set\n", hp_slot);
 	}

 	queue_interrupt_event(p_slot, event_type);

 	return 1;
 }

 /* The following routines constitute the bulk of the
    hotplug controller logic
  */

 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 {
 	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 	if (POWER_CTRL(ctrl->ctrlcap)) {
 		if (pslot->hpc_ops->power_off_slot(pslot)) {
 			err("%s: Issue of Slot Power Off command failed\n",
 			    __FUNCTION__);
 			return;
 		}
 	}

 	if (PWR_LED(ctrl->ctrlcap))
 		pslot->hpc_ops->green_led_off(pslot);

 	if (ATTN_LED(ctrl->ctrlcap)) {
 		if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 			err("%s: Issue of Set Attention Led command failed\n",
 			    __FUNCTION__);
 			return;
 		}
 	}
 }

 /**
  * board_added - Called after a board has been added to the system.
  * @p_slot: &slot where board is added
  *
  * Turns power on for the board.
  * Configures board.
  */
 static int board_added(struct slot *p_slot)
 {
 	int retval = 0;
 	struct controller *ctrl = p_slot->ctrl;

 	dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
 			__FUNCTION__, p_slot->device,
 			ctrl->slot_device_offset, p_slot->hp_slot);

 	if (POWER_CTRL(ctrl->ctrlcap)) {
 		/* Power on slot */
 		retval = p_slot->hpc_ops->power_on_slot(p_slot);
 		if (retval)
 			return retval;
 	}

 	if (PWR_LED(ctrl->ctrlcap))
 		p_slot->hpc_ops->green_led_blink(p_slot);

 	/* Wait for ~1 second */
 	msleep(1000);

 	/* Check link training status */
 	retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 	if (retval) {
 		err("%s: Failed to check link status\n", __FUNCTION__);
 		set_slot_off(ctrl, p_slot);
 		return retval;
 	}

 	/* Check for a power fault */
 	if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 		dbg("%s: power fault detected\n", __FUNCTION__);
 		retval = POWER_FAILURE;
 		goto err_exit;
 	}

 	retval = pciehp_configure_device(p_slot);
 	if (retval) {
 		err("Cannot add device 0x%x:%x\n", p_slot->bus,
 		    p_slot->device);
 		goto err_exit;
 	}

 	/*
 	 * Some PCI Express root ports require fixup after hot-plug operation.
 	 */
 	if (pcie_mch_quirk)
 		pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 	if (PWR_LED(ctrl->ctrlcap))
   		p_slot->hpc_ops->green_led_on(p_slot);

 	return 0;

 err_exit:
 	set_slot_off(ctrl, p_slot);
 	return retval;
 }

 /**
  * remove_board - Turns off slot and LEDs
  * @p_slot: slot where board is being removed
  */
 static int remove_board(struct slot *p_slot)
 {
 	int retval = 0;
 	struct controller *ctrl = p_slot->ctrl;

 	retval = pciehp_unconfigure_device(p_slot);
 	if (retval)
 		return retval;

 	dbg("In %s, hp_slot = %d\n", __FUNCTION__, p_slot->hp_slot);

 	if (POWER_CTRL(ctrl->ctrlcap)) {
 		/* power off slot */
 		retval = p_slot->hpc_ops->power_off_slot(p_slot);
 		if (retval) {
 			err("%s: Issue of Slot Disable command failed\n",
 			    __FUNCTION__);
 			return retval;
 		}
 	}

 	if (PWR_LED(ctrl->ctrlcap))
 		/* turn off Green LED */
 		p_slot->hpc_ops->green_led_off(p_slot);

 	return 0;
 }

 struct power_work_info {
 	struct slot *p_slot;
 	struct work_struct work;
 };

 /**
  * pciehp_power_thread - handle pushbutton events
  * @work: &struct work_struct describing work to be done
  *
  * Scheduled procedure to handle blocking stuff for the pushbuttons.
  * Handles all pending events and exits.
  */
 static void pciehp_power_thread(struct work_struct *work)
 {
 	struct power_work_info *info =
 		container_of(work, struct power_work_info, work);
 	struct slot *p_slot = info->p_slot;

 	mutex_lock(&p_slot->lock);
 	switch (p_slot->state) {
 	case POWEROFF_STATE:
 		mutex_unlock(&p_slot->lock);
 		dbg("%s: disabling bus:device(%x:%x)\n",
 		    __FUNCTION__, p_slot->bus, p_slot->device);
 		pciehp_disable_slot(p_slot);
 		mutex_lock(&p_slot->lock);
 		p_slot->state = STATIC_STATE;
 		break;
 	case POWERON_STATE:
 		mutex_unlock(&p_slot->lock);
 		if (pciehp_enable_slot(p_slot) &&
 		    PWR_LED(p_slot->ctrl->ctrlcap))
 			p_slot->hpc_ops->green_led_off(p_slot);
 		mutex_lock(&p_slot->lock);
 		p_slot->state = STATIC_STATE;
 		break;
 	default:
 		break;
 	}
 	mutex_unlock(&p_slot->lock);

 	kfree(info);
 }

 void pciehp_queue_pushbutton_work(struct work_struct *work)
 {
 	struct slot *p_slot = container_of(work, struct slot, work.work);
 	struct power_work_info *info;

 	info = kmalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		err("%s: Cannot allocate memory\n", __FUNCTION__);
 		return;
 	}
 	info->p_slot = p_slot;
 	INIT_WORK(&info->work, pciehp_power_thread);

 	mutex_lock(&p_slot->lock);
 	switch (p_slot->state) {
 	case BLINKINGOFF_STATE:
 		p_slot->state = POWEROFF_STATE;
 		break;
 	case BLINKINGON_STATE:
 		p_slot->state = POWERON_STATE;
 		break;
 	default:
 		goto out;
 	}
 	queue_work(pciehp_wq, &info->work);
  out:
 	mutex_unlock(&p_slot->lock);
 }

 static int update_slot_info(struct slot *slot)
 {
 	struct hotplug_slot_info *info;
 	int result;

 	info = kmalloc(sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;

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

 	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 	kfree (info);
 	return result;
 }

 /*
  * Note: This function must be called with slot->lock held
  */
 static void handle_button_press_event(struct slot *p_slot)
 {
 	struct controller *ctrl = p_slot->ctrl;
 	u8 getstatus;

 	switch (p_slot->state) {
 	case STATIC_STATE:
 		p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 		if (getstatus) {
 			p_slot->state = BLINKINGOFF_STATE;
 			info("PCI slot #%s - powering off due to button "
 			     "press.\n", p_slot->name);
 		} else {
 			p_slot->state = BLINKINGON_STATE;
 			info("PCI slot #%s - powering on due to button "
 			     "press.\n", p_slot->name);
 		}
 		/* blink green LED and turn off amber */
 		if (PWR_LED(ctrl->ctrlcap))
 			p_slot->hpc_ops->green_led_blink(p_slot);
 		if (ATTN_LED(ctrl->ctrlcap))
 			p_slot->hpc_ops->set_attention_status(p_slot, 0);

 		schedule_delayed_work(&p_slot->work, 5*HZ);
 		break;
 	case BLINKINGOFF_STATE:
 	case BLINKINGON_STATE:
 		/*
 		 * Cancel if we are still blinking; this means that we
 		 * press the attention again before the 5 sec. limit
 		 * expires to cancel hot-add or hot-remove
 		 */
 		info("Button cancel on Slot(%s)\n", p_slot->name);
 		dbg("%s: button cancel\n", __FUNCTION__);
 		cancel_delayed_work(&p_slot->work);
 		if (p_slot->state == BLINKINGOFF_STATE) {
 			if (PWR_LED(ctrl->ctrlcap))
 				p_slot->hpc_ops->green_led_on(p_slot);
 		} else {
 			if (PWR_LED(ctrl->ctrlcap))
 				p_slot->hpc_ops->green_led_off(p_slot);
 		}
 		if (ATTN_LED(ctrl->ctrlcap))
 			p_slot->hpc_ops->set_attention_status(p_slot, 0);
 		info("PCI slot #%s - action canceled due to button press\n",
 		     p_slot->name);
 		p_slot->state = STATIC_STATE;
 		break;
 	case POWEROFF_STATE:
 	case POWERON_STATE:
 		/*
 		 * Ignore if the slot is on power-on or power-off state;
 		 * this means that the previous attention button action
 		 * to hot-add or hot-remove is undergoing
 		 */
 		info("Button ignore on Slot(%s)\n", p_slot->name);
 		update_slot_info(p_slot);
 		break;
 	default:
 		warn("Not a valid state\n");
 		break;
 	}
 }

 /*
  * Note: This function must be called with slot->lock held
  */
 static void handle_surprise_event(struct slot *p_slot)
 {
 	u8 getstatus;
 	struct power_work_info *info;

 	info = kmalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		err("%s: Cannot allocate memory\n", __FUNCTION__);
 		return;
 	}
 	info->p_slot = p_slot;
 	INIT_WORK(&info->work, pciehp_power_thread);

 	p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 	if (!getstatus)
 		p_slot->state = POWEROFF_STATE;
 	else
 		p_slot->state = POWERON_STATE;

 	queue_work(pciehp_wq, &info->work);
 }

 static void interrupt_event_handler(struct work_struct *work)
 {
 	struct event_info *info = container_of(work, struct event_info, work);
 	struct slot *p_slot = info->p_slot;
 	struct controller *ctrl = p_slot->ctrl;

 	mutex_lock(&p_slot->lock);
 	switch (info->event_type) {
 	case INT_BUTTON_PRESS:
 		handle_button_press_event(p_slot);
 		break;
 	case INT_POWER_FAULT:
 		if (!POWER_CTRL(ctrl->ctrlcap))
 			break;
 		if (ATTN_LED(ctrl->ctrlcap))
 			p_slot->hpc_ops->set_attention_status(p_slot, 1);
 		if (PWR_LED(ctrl->ctrlcap))
 			p_slot->hpc_ops->green_led_off(p_slot);
 		break;
 	case INT_PRESENCE_ON:
 	case INT_PRESENCE_OFF:
 		if (!HP_SUPR_RM(ctrl->ctrlcap))
 			break;
 		dbg("Surprise Removal\n");
 		update_slot_info(p_slot);
 		handle_surprise_event(p_slot);
 		break;
 	default:
 		update_slot_info(p_slot);
 		break;
 	}
 	mutex_unlock(&p_slot->lock);

 	kfree(info);
 }

 int pciehp_enable_slot(struct slot *p_slot)
 {
 	u8 getstatus = 0;
 	int rc;

 	/* Check to see if (latch closed, card present, power off) */
 	mutex_lock(&p_slot->ctrl->crit_sect);

 	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 	if (rc || !getstatus) {
 		info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 		     p_slot->name);
 		mutex_unlock(&p_slot->ctrl->crit_sect);
 		return -ENODEV;
 	}
 	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 		rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 		if (rc || getstatus) {
 			info("%s: latch open on slot(%s)\n", __FUNCTION__,
 			     p_slot->name);
 			mutex_unlock(&p_slot->ctrl->crit_sect);
 			return -ENODEV;
 		}
 	}

 	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 		rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 		if (rc || getstatus) {
 			info("%s: already enabled on slot(%s)\n", __FUNCTION__,
 			     p_slot->name);
 			mutex_unlock(&p_slot->ctrl->crit_sect);
 			return -EINVAL;
 		}
 	}

 	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

 	rc = board_added(p_slot);
 	if (rc) {
 		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 	}

 	update_slot_info(p_slot);

 	mutex_unlock(&p_slot->ctrl->crit_sect);
 	return rc;
 }


 int pciehp_disable_slot(struct slot *p_slot)
 {
 	u8 getstatus = 0;
 	int ret = 0;

 	if (!p_slot->ctrl)
 		return 1;

 	/* Check to see if (latch closed, card present, power on) */
 	mutex_lock(&p_slot->ctrl->crit_sect);

 	if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
 		ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 		if (ret || !getstatus) {
 			info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 			     p_slot->name);
 			mutex_unlock(&p_slot->ctrl->crit_sect);
 			return -ENODEV;
 		}
 	}

 	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 		ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 		if (ret || getstatus) {
 			info("%s: latch open on slot(%s)\n", __FUNCTION__,
 			     p_slot->name);
 			mutex_unlock(&p_slot->ctrl->crit_sect);
 			return -ENODEV;
 		}
 	}

 	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 		ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 		if (ret || !getstatus) {
 			info("%s: already disabled slot(%s)\n", __FUNCTION__,
 			     p_slot->name);
 			mutex_unlock(&p_slot->ctrl->crit_sect);
 			return -EINVAL;
 		}
 	}

 	ret = remove_board(p_slot);
 	update_slot_info(p_slot);

 	mutex_unlock(&p_slot->ctrl->crit_sect);
 	return ret;
 }

 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 {
 	int retval = -ENODEV;

 	mutex_lock(&p_slot->lock);
 	switch (p_slot->state) {
 	case BLINKINGON_STATE:
 		cancel_delayed_work(&p_slot->work);
 	case STATIC_STATE:
 		p_slot->state = POWERON_STATE;
 		mutex_unlock(&p_slot->lock);
 		retval = pciehp_enable_slot(p_slot);
 		mutex_lock(&p_slot->lock);
 		p_slot->state = STATIC_STATE;
 		break;
 	case POWERON_STATE:
 		info("Slot %s is already in powering on state\n",
 		     p_slot->name);
 		break;
 	case BLINKINGOFF_STATE:
 	case POWEROFF_STATE:
 		info("Already enabled on slot %s\n", p_slot->name);
 		break;
 	default:
 		err("Not a valid state on slot %s\n", p_slot->name);
 		break;
 	}
 	mutex_unlock(&p_slot->lock);

 	return retval;
 }

 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 {
 	int retval = -ENODEV;

 	mutex_lock(&p_slot->lock);
 	switch (p_slot->state) {
 	case BLINKINGOFF_STATE:
 		cancel_delayed_work(&p_slot->work);
 	case STATIC_STATE:
 		p_slot->state = POWEROFF_STATE;
 		mutex_unlock(&p_slot->lock);
 		retval = pciehp_disable_slot(p_slot);
 		mutex_lock(&p_slot->lock);
 		p_slot->state = STATIC_STATE;
 		break;
 	case POWEROFF_STATE:
 		info("Slot %s is already in powering off state\n",
 		     p_slot->name);
 		break;
 	case BLINKINGON_STATE:
 	case POWERON_STATE:
 		info("Already disabled on slot %s\n", p_slot->name);
 		break;
 	default:
 		err("Not a valid state on slot %s\n", p_slot->name);
 		break;
 	}
 	mutex_unlock(&p_slot->lock);

 	return retval;
 }
	/*
	* 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/kernel.h>
	#include <linux/types.h>
	#include <linux/smp_lock.h>
	#include <linux/pci.h>
	#include <linux/workqueue.h>
	#include "../pci.h"
	#include "pciehp.h"

	static void interrupt_event_handler(struct work_struct *work);

	static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
	{
	struct event_info *info;

	info = kmalloc(sizeof(*info), GFP_ATOMIC);
	if (!info)
	return -ENOMEM;

	info->event_type = event_type;
	info->p_slot = p_slot;
	INIT_WORK(&info->work, interrupt_event_handler);

	schedule_work(&info->work);

	return 0;
	}

	u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
	{
	struct slot *p_slot;
	u32 event_type;

	/* Attention Button Change */
	dbg("pciehp: Attention button interrupt received.\n");

	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	/*
	* Button pressed - See if need to TAKE ACTION!!!
	*/
	info("Button pressed on Slot(%s)\n", p_slot->name);
	event_type = INT_BUTTON_PRESS;

	queue_interrupt_event(p_slot, event_type);

	return 0;
	}

	u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
	{
	struct slot *p_slot;
	u8 getstatus;
	u32 event_type;

	/* Switch Change */
	dbg("pciehp: Switch interrupt received.\n");

	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

	if (getstatus) {
	/*
	* Switch opened
	*/
	info("Latch open on Slot(%s)\n", p_slot->name);
	event_type = INT_SWITCH_OPEN;
	} else {
	/*
	* Switch closed
	*/
	info("Latch close on Slot(%s)\n", p_slot->name);
	event_type = INT_SWITCH_CLOSE;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
	}

	u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
	{
	struct slot *p_slot;
	u32 event_type;
	u8 presence_save;

	/* Presence Change */
	dbg("pciehp: Presence/Notify input change.\n");

	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	/* Switch is open, assume a presence change
	* Save the presence state
	*/
	p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
	if (presence_save) {
	/*
	* Card Present
	*/
	info("Card present on Slot(%s)\n", p_slot->name);
	event_type = INT_PRESENCE_ON;
	} else {
	/*
	* Not Present
	*/
	info("Card not present on Slot(%s)\n", p_slot->name);
	event_type = INT_PRESENCE_OFF;
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
	}

	u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
	{
	struct slot *p_slot;
	u32 event_type;

	/* power fault */
	dbg("pciehp: Power fault interrupt received.\n");

	p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);

	if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
	/*
	* power fault Cleared
	*/
	info("Power fault cleared on Slot(%s)\n", p_slot->name);
	event_type = INT_POWER_FAULT_CLEAR;
	} else {
	/*
	* power fault
	*/
	info("Power fault on Slot(%s)\n", p_slot->name);
	event_type = INT_POWER_FAULT;
	info("power fault bit %x set\n", hp_slot);
	}

	queue_interrupt_event(p_slot, event_type);

	return 1;
	}

	/* The following routines constitute the bulk of the
	hotplug controller logic
	*/

	static void set_slot_off(struct controller ctrl, struct slot pslot)
	{
	/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
	if (POWER_CTRL(ctrl->ctrlcap)) {
	if (pslot->hpc_ops->power_off_slot(pslot)) {
	err("%s: Issue of Slot Power Off command failed\n",
	__FUNCTION__);
	return;
	}
	}

	if (PWR_LED(ctrl->ctrlcap))
	pslot->hpc_ops->green_led_off(pslot);

	if (ATTN_LED(ctrl->ctrlcap)) {
	if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
	err("%s: Issue of Set Attention Led command failed\n",
	__FUNCTION__);
	return;
	}
	}
	}

	/**
	* board_added - Called after a board has been added to the system.
	* @p_slot: &slot where board is added
	*
	* Turns power on for the board.
	* Configures board.
	*/
	static int board_added(struct slot *p_slot)
	{
	int retval = 0;
	struct controller *ctrl = p_slot->ctrl;

	dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
	__FUNCTION__, p_slot->device,
	ctrl->slot_device_offset, p_slot->hp_slot);

	if (POWER_CTRL(ctrl->ctrlcap)) {
	/* Power on slot */
	retval = p_slot->hpc_ops->power_on_slot(p_slot);
	if (retval)
	return retval;
	}

	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_blink(p_slot);

	/* Wait for ~1 second */
	msleep(1000);

	/* Check link training status */
	retval = p_slot->hpc_ops->check_lnk_status(ctrl);
	if (retval) {
	err("%s: Failed to check link status\n", __FUNCTION__);
	set_slot_off(ctrl, p_slot);
	return retval;
	}

	/* Check for a power fault */
	if (p_slot->hpc_ops->query_power_fault(p_slot)) {
	dbg("%s: power fault detected\n", __FUNCTION__);
	retval = POWER_FAILURE;
	goto err_exit;
	}

	retval = pciehp_configure_device(p_slot);
	if (retval) {
	err("Cannot add device 0x%x:%x\n", p_slot->bus,
	p_slot->device);
	goto err_exit;
	}

	/*
	* Some PCI Express root ports require fixup after hot-plug operation.
	*/
	if (pcie_mch_quirk)
	pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_on(p_slot);

	return 0;

	err_exit:
	set_slot_off(ctrl, p_slot);
	return retval;
	}

	/**
	* remove_board - Turns off slot and LEDs
	* @p_slot: slot where board is being removed
	*/
	static int remove_board(struct slot *p_slot)
	{
	int retval = 0;
	struct controller *ctrl = p_slot->ctrl;

	retval = pciehp_unconfigure_device(p_slot);
	if (retval)
	return retval;

	dbg("In %s, hp_slot = %d\n", __FUNCTION__, p_slot->hp_slot);

	if (POWER_CTRL(ctrl->ctrlcap)) {
	/* power off slot */
	retval = p_slot->hpc_ops->power_off_slot(p_slot);
	if (retval) {
	err("%s: Issue of Slot Disable command failed\n",
	__FUNCTION__);
	return retval;
	}
	}

	if (PWR_LED(ctrl->ctrlcap))
	/* turn off Green LED */
	p_slot->hpc_ops->green_led_off(p_slot);

	return 0;
	}

	struct power_work_info {
	struct slot *p_slot;
	struct work_struct work;
	};

	/**
	* pciehp_power_thread - handle pushbutton events
	* @work: &struct work_struct describing work to be done
	*
	* Scheduled procedure to handle blocking stuff for the pushbuttons.
	* Handles all pending events and exits.
	*/
	static void pciehp_power_thread(struct work_struct *work)
	{
	struct power_work_info *info =
	container_of(work, struct power_work_info, work);
	struct slot *p_slot = info->p_slot;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case POWEROFF_STATE:
	mutex_unlock(&p_slot->lock);
	dbg("%s: disabling bus:device(%x:%x)\n",
	__FUNCTION__, p_slot->bus, p_slot->device);
	pciehp_disable_slot(p_slot);
	mutex_lock(&p_slot->lock);
	p_slot->state = STATIC_STATE;
	break;
	case POWERON_STATE:
	mutex_unlock(&p_slot->lock);
	if (pciehp_enable_slot(p_slot) &&
	PWR_LED(p_slot->ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_off(p_slot);
	mutex_lock(&p_slot->lock);
	p_slot->state = STATIC_STATE;
	break;
	default:
	break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
	}

	void pciehp_queue_pushbutton_work(struct work_struct *work)
	{
	struct slot *p_slot = container_of(work, struct slot, work.work);
	struct power_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
	err("%s: Cannot allocate memory\n", __FUNCTION__);
	return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, pciehp_power_thread);

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
	p_slot->state = POWEROFF_STATE;
	break;
	case BLINKINGON_STATE:
	p_slot->state = POWERON_STATE;
	break;
	default:
	goto out;
	}
	queue_work(pciehp_wq, &info->work);
	out:
	mutex_unlock(&p_slot->lock);
	}

	static int update_slot_info(struct slot *slot)
	{
	struct hotplug_slot_info *info;
	int result;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;

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

	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
	kfree (info);
	return result;
	}

	/*
	* Note: This function must be called with slot->lock held
	*/
	static void handle_button_press_event(struct slot *p_slot)
	{
	struct controller *ctrl = p_slot->ctrl;
	u8 getstatus;

	switch (p_slot->state) {
	case STATIC_STATE:
	p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (getstatus) {
	p_slot->state = BLINKINGOFF_STATE;
	info("PCI slot #%s - powering off due to button "
	"press.\n", p_slot->name);
	} else {
	p_slot->state = BLINKINGON_STATE;
	info("PCI slot #%s - powering on due to button "
	"press.\n", p_slot->name);
	}
	/* blink green LED and turn off amber */
	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_blink(p_slot);
	if (ATTN_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->set_attention_status(p_slot, 0);

	schedule_delayed_work(&p_slot->work, 5*HZ);
	break;
	case BLINKINGOFF_STATE:
	case BLINKINGON_STATE:
	/*
	* Cancel if we are still blinking; this means that we
	* press the attention again before the 5 sec. limit
	* expires to cancel hot-add or hot-remove
	*/
	info("Button cancel on Slot(%s)\n", p_slot->name);
	dbg("%s: button cancel\n", __FUNCTION__);
	cancel_delayed_work(&p_slot->work);
	if (p_slot->state == BLINKINGOFF_STATE) {
	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_on(p_slot);
	} else {
	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_off(p_slot);
	}
	if (ATTN_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->set_attention_status(p_slot, 0);
	info("PCI slot #%s - action canceled due to button press\n",
	p_slot->name);
	p_slot->state = STATIC_STATE;
	break;
	case POWEROFF_STATE:
	case POWERON_STATE:
	/*
	* Ignore if the slot is on power-on or power-off state;
	* this means that the previous attention button action
	* to hot-add or hot-remove is undergoing
	*/
	info("Button ignore on Slot(%s)\n", p_slot->name);
	update_slot_info(p_slot);
	break;
	default:
	warn("Not a valid state\n");
	break;
	}
	}

	/*
	* Note: This function must be called with slot->lock held
	*/
	static void handle_surprise_event(struct slot *p_slot)
	{
	u8 getstatus;
	struct power_work_info *info;

	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
	err("%s: Cannot allocate memory\n", __FUNCTION__);
	return;
	}
	info->p_slot = p_slot;
	INIT_WORK(&info->work, pciehp_power_thread);

	p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (!getstatus)
	p_slot->state = POWEROFF_STATE;
	else
	p_slot->state = POWERON_STATE;

	queue_work(pciehp_wq, &info->work);
	}

	static void interrupt_event_handler(struct work_struct *work)
	{
	struct event_info *info = container_of(work, struct event_info, work);
	struct slot *p_slot = info->p_slot;
	struct controller *ctrl = p_slot->ctrl;

	mutex_lock(&p_slot->lock);
	switch (info->event_type) {
	case INT_BUTTON_PRESS:
	handle_button_press_event(p_slot);
	break;
	case INT_POWER_FAULT:
	if (!POWER_CTRL(ctrl->ctrlcap))
	break;
	if (ATTN_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->set_attention_status(p_slot, 1);
	if (PWR_LED(ctrl->ctrlcap))
	p_slot->hpc_ops->green_led_off(p_slot);
	break;
	case INT_PRESENCE_ON:
	case INT_PRESENCE_OFF:
	if (!HP_SUPR_RM(ctrl->ctrlcap))
	break;
	dbg("Surprise Removal\n");
	update_slot_info(p_slot);
	handle_surprise_event(p_slot);
	break;
	default:
	update_slot_info(p_slot);
	break;
	}
	mutex_unlock(&p_slot->lock);

	kfree(info);
	}

	int pciehp_enable_slot(struct slot *p_slot)
	{
	u8 getstatus = 0;
	int rc;

	/* Check to see if (latch closed, card present, power off) */
	mutex_lock(&p_slot->ctrl->crit_sect);

	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (rc \|\| !getstatus) {
	info("%s: no adapter on slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -ENODEV;
	}
	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (rc \|\| getstatus) {
	info("%s: latch open on slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -ENODEV;
	}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (rc \|\| getstatus) {
	info("%s: already enabled on slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -EINVAL;
	}
	}

	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);

	rc = board_added(p_slot);
	if (rc) {
	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	}

	update_slot_info(p_slot);

	mutex_unlock(&p_slot->ctrl->crit_sect);
	return rc;
	}


	int pciehp_disable_slot(struct slot *p_slot)
	{
	u8 getstatus = 0;
	int ret = 0;

	if (!p_slot->ctrl)
	return 1;

	/* Check to see if (latch closed, card present, power on) */
	mutex_lock(&p_slot->ctrl->crit_sect);

	if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
	ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
	if (ret \|\| !getstatus) {
	info("%s: no adapter on slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -ENODEV;
	}
	}

	if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
	ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
	if (ret \|\| getstatus) {
	info("%s: latch open on slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -ENODEV;
	}
	}

	if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
	ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
	if (ret \|\| !getstatus) {
	info("%s: already disabled slot(%s)\n", __FUNCTION__,
	p_slot->name);
	mutex_unlock(&p_slot->ctrl->crit_sect);
	return -EINVAL;
	}
	}

	ret = remove_board(p_slot);
	update_slot_info(p_slot);

	mutex_unlock(&p_slot->ctrl->crit_sect);
	return ret;
	}

	int pciehp_sysfs_enable_slot(struct slot *p_slot)
	{
	int retval = -ENODEV;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGON_STATE:
	cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
	p_slot->state = POWERON_STATE;
	mutex_unlock(&p_slot->lock);
	retval = pciehp_enable_slot(p_slot);
	mutex_lock(&p_slot->lock);
	p_slot->state = STATIC_STATE;
	break;
	case POWERON_STATE:
	info("Slot %s is already in powering on state\n",
	p_slot->name);
	break;
	case BLINKINGOFF_STATE:
	case POWEROFF_STATE:
	info("Already enabled on slot %s\n", p_slot->name);
	break;
	default:
	err("Not a valid state on slot %s\n", p_slot->name);
	break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
	}

	int pciehp_sysfs_disable_slot(struct slot *p_slot)
	{
	int retval = -ENODEV;

	mutex_lock(&p_slot->lock);
	switch (p_slot->state) {
	case BLINKINGOFF_STATE:
	cancel_delayed_work(&p_slot->work);
	case STATIC_STATE:
	p_slot->state = POWEROFF_STATE;
	mutex_unlock(&p_slot->lock);
	retval = pciehp_disable_slot(p_slot);
	mutex_lock(&p_slot->lock);
	p_slot->state = STATIC_STATE;
	break;
	case POWEROFF_STATE:
	info("Slot %s is already in powering off state\n",
	p_slot->name);
	break;
	case BLINKINGON_STATE:
	case POWERON_STATE:
	info("Already disabled on slot %s\n", p_slot->name);
	break;
	default:
	err("Not a valid state on slot %s\n", p_slot->name);
	break;
	}
	mutex_unlock(&p_slot->lock);

	return retval;
	}