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

 /*
  * Standard 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 <linux/workqueue.h>
 #include "shpchp.h"

 /* Global variables */
 int shpchp_debug;
 int shpchp_poll_mode;
 int shpchp_poll_time;
 struct workqueue_struct *shpchp_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	"Standard Hot Plug PCI Controller Driver"

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

 module_param(shpchp_debug, bool, 0644);
 module_param(shpchp_poll_mode, bool, 0644);
 module_param(shpchp_poll_time, int, 0644);
 MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");

 #define SHPC_MODULE_NAME "shpchp"

 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_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 shpchp_hotplug_slot_ops = {
 	.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_max_bus_speed =	get_max_bus_speed,
 	.get_cur_bus_speed =	get_cur_bus_speed,
 };

 /**
  * 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;

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

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

 static int init_slots(struct controller *ctrl)
 {
 	struct slot *slot;
 	struct hotplug_slot *hotplug_slot;
 	struct hotplug_slot_info *info;
 	char name[SLOT_NAME_SIZE];
 	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;

 		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 + (ctrl->slot_num_inc * i);
 		mutex_init(&slot->lock);
 		INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);

 		/* register this slot with the hotplug pci core */
 		hotplug_slot->private = slot;
 		hotplug_slot->release = &release_slot;
 		snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
 		hotplug_slot->ops = &shpchp_hotplug_slot_ops;

  		ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
  			 "hp_slot=%x sun=%x slot_device_offset=%x\n",
  			 pci_domain_nr(ctrl->pci_dev->subordinate),
  			 slot->bus, slot->device, slot->hp_slot, slot->number,
  			 ctrl->slot_device_offset);
 		retval = pci_hp_register(slot->hotplug_slot,
 				ctrl->pci_dev->subordinate, slot->device, name);
 		if (retval) {
 			ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
 				 retval);
 			goto error_info;
 		}

 		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);

 		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;
 }

 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);
 		cancel_delayed_work(&slot->work);
 		flush_scheduled_work();
 		flush_workqueue(shpchp_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 = get_slot(hotplug_slot);

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	hotplug_slot->info->attention_status = status;
 	slot->hpc_ops->set_attention_status(slot, status);

 	return 0;
 }

 static int enable_slot (struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = get_slot(hotplug_slot);

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	return shpchp_sysfs_enable_slot(slot);
 }

 static int disable_slot (struct hotplug_slot *hotplug_slot)
 {
 	struct slot *slot = get_slot(hotplug_slot);

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	return shpchp_sysfs_disable_slot(slot);
 }

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

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	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 = get_slot(hotplug_slot);
 	int retval;

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	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 = get_slot(hotplug_slot);
 	int retval;

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	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 = get_slot(hotplug_slot);
 	int retval;

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

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

 	return 0;
 }

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

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

 	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 = get_slot(hotplug_slot);
 	int retval;

 	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 		 __func__, slot_name(slot));

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

 	return 0;
 }

 static int is_shpc_capable(struct pci_dev *dev)
 {
 	if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
 						PCI_DEVICE_ID_AMD_GOLAM_7450))
 		return 1;
 	if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
 		return 0;
 	if (get_hp_hw_control_from_firmware(dev))
 		return 0;
 	return 1;
 }

 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	int rc;
 	struct controller *ctrl;

 	if (!is_shpc_capable(pdev))
 		return -ENODEV;

 	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 	if (!ctrl) {
 		dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
 		goto err_out_none;
 	}
 	INIT_LIST_HEAD(&ctrl->slot_list);

 	rc = shpc_init(ctrl, pdev);
 	if (rc) {
 		ctrl_dbg(ctrl, "Controller initialization failed\n");
 		goto err_out_free_ctrl;
 	}

 	pci_set_drvdata(pdev, ctrl);

 	/* Setup the slot information structures */
 	rc = init_slots(ctrl);
 	if (rc) {
 		ctrl_err(ctrl, "Slot initialization failed\n");
 		goto err_out_release_ctlr;
 	}

 	rc = shpchp_create_ctrl_files(ctrl);
 	if (rc)
 		goto err_cleanup_slots;

 	return 0;

 err_cleanup_slots:
 	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 shpc_remove(struct pci_dev *dev)
 {
 	struct controller *ctrl = pci_get_drvdata(dev);

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

 static struct pci_device_id shpcd_pci_tbl[] = {
 	{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
 	{ /* end: all zeroes */ }
 };
 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);

 static struct pci_driver shpc_driver = {
 	.name =		SHPC_MODULE_NAME,
 	.id_table =	shpcd_pci_tbl,
 	.probe =	shpc_probe,
 	.remove =	shpc_remove,
 };

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

 	retval = pci_register_driver(&shpc_driver);
 	dbg("%s: pci_register_driver = %d\n", __func__, retval);
 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 	return retval;
 }

 static void __exit shpcd_cleanup(void)
 {
 	dbg("unload_shpchpd()\n");
 	pci_unregister_driver(&shpc_driver);
 	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
 }

 module_init(shpcd_init);
 module_exit(shpcd_cleanup);
	/*
	* Standard 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 <linux/workqueue.h>
	#include "shpchp.h"

	/* Global variables */
	int shpchp_debug;
	int shpchp_poll_mode;
	int shpchp_poll_time;
	struct workqueue_struct *shpchp_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 "Standard Hot Plug PCI Controller Driver"

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

	module_param(shpchp_debug, bool, 0644);
	module_param(shpchp_poll_mode, bool, 0644);
	module_param(shpchp_poll_time, int, 0644);
	MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
	MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
	MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");

	#define SHPC_MODULE_NAME "shpchp"

	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_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 shpchp_hotplug_slot_ops = {
	.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_max_bus_speed = get_max_bus_speed,
	.get_cur_bus_speed = get_cur_bus_speed,
	};

	/**
	* 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;

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

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

	static int init_slots(struct controller *ctrl)
	{
	struct slot *slot;
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
	char name[SLOT_NAME_SIZE];
	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;

	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 + (ctrl->slot_num_inc * i);
	mutex_init(&slot->lock);
	INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);

	/* register this slot with the hotplug pci core */
	hotplug_slot->private = slot;
	hotplug_slot->release = &release_slot;
	snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
	hotplug_slot->ops = &shpchp_hotplug_slot_ops;

	ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
	"hp_slot=%x sun=%x slot_device_offset=%x\n",
	pci_domain_nr(ctrl->pci_dev->subordinate),
	slot->bus, slot->device, slot->hp_slot, slot->number,
	ctrl->slot_device_offset);
	retval = pci_hp_register(slot->hotplug_slot,
	ctrl->pci_dev->subordinate, slot->device, name);
	if (retval) {
	ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
	retval);
	goto error_info;
	}

	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);

	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;
	}

	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);
	cancel_delayed_work(&slot->work);
	flush_scheduled_work();
	flush_workqueue(shpchp_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 = get_slot(hotplug_slot);

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	hotplug_slot->info->attention_status = status;
	slot->hpc_ops->set_attention_status(slot, status);

	return 0;
	}

	static int enable_slot (struct hotplug_slot *hotplug_slot)
	{
	struct slot *slot = get_slot(hotplug_slot);

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	return shpchp_sysfs_enable_slot(slot);
	}

	static int disable_slot (struct hotplug_slot *hotplug_slot)
	{
	struct slot *slot = get_slot(hotplug_slot);

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	return shpchp_sysfs_disable_slot(slot);
	}

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

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	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 = get_slot(hotplug_slot);
	int retval;

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	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 = get_slot(hotplug_slot);
	int retval;

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	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 = get_slot(hotplug_slot);
	int retval;

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

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

	return 0;
	}

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

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

	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 = get_slot(hotplug_slot);
	int retval;

	ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
	__func__, slot_name(slot));

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

	return 0;
	}

	static int is_shpc_capable(struct pci_dev *dev)
	{
	if ((dev->vendor == PCI_VENDOR_ID_AMD) \|\| (dev->device ==
	PCI_DEVICE_ID_AMD_GOLAM_7450))
	return 1;
	if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
	return 0;
	if (get_hp_hw_control_from_firmware(dev))
	return 0;
	return 1;
	}

	static int shpc_probe(struct pci_dev pdev, const struct pci_device_id ent)
	{
	int rc;
	struct controller *ctrl;

	if (!is_shpc_capable(pdev))
	return -ENODEV;

	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl) {
	dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
	goto err_out_none;
	}
	INIT_LIST_HEAD(&ctrl->slot_list);

	rc = shpc_init(ctrl, pdev);
	if (rc) {
	ctrl_dbg(ctrl, "Controller initialization failed\n");
	goto err_out_free_ctrl;
	}

	pci_set_drvdata(pdev, ctrl);

	/* Setup the slot information structures */
	rc = init_slots(ctrl);
	if (rc) {
	ctrl_err(ctrl, "Slot initialization failed\n");
	goto err_out_release_ctlr;
	}

	rc = shpchp_create_ctrl_files(ctrl);
	if (rc)
	goto err_cleanup_slots;

	return 0;

	err_cleanup_slots:
	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 shpc_remove(struct pci_dev *dev)
	{
	struct controller *ctrl = pci_get_drvdata(dev);

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

	static struct pci_device_id shpcd_pci_tbl[] = {
	{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) \| 0x00), ~0)},
	{ /* end: all zeroes */ }
	};
	MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);

	static struct pci_driver shpc_driver = {
	.name = SHPC_MODULE_NAME,
	.id_table = shpcd_pci_tbl,
	.probe = shpc_probe,
	.remove = shpc_remove,
	};

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

	retval = pci_register_driver(&shpc_driver);
	dbg("%s: pci_register_driver = %d\n", __func__, retval);
	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	return retval;
	}

	static void __exit shpcd_cleanup(void)
	{
	dbg("unload_shpchpd()\n");
	pci_unregister_driver(&shpc_driver);
	info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
	}

	module_init(shpcd_init);
	module_exit(shpcd_cleanup);