[deliverable/linux.git] / drivers / pci / hotplug / acpiphp_core.c

/*
 * ACPI PCI 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) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
 * Copyright (C) 2002,2003 NEC Corporation
 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
 * Copyright (C) 2003-2005 Hewlett Packard
 *
 * 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 <kristen.c.accardi@intel.com>
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include "acpiphp.h"

#define MY_NAME	"acpiphp"

static int debug;
int acpiphp_debug;

/* local variables */
static int num_slots;
static struct acpiphp_attention_info *attention_info;

#define DRIVER_VERSION	"0.5"
#define DRIVER_AUTHOR	"Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
#define DRIVER_DESC	"ACPI Hot Plug PCI Controller Driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
module_param(debug, bool, 0644);

/* export the attention callback registration methods */
EXPORT_SYMBOL_GPL(acpiphp_register_attention);
EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);

static int enable_slot		(struct hotplug_slot *slot);
static int disable_slot		(struct hotplug_slot *slot);
static int set_attention_status (struct hotplug_slot *slot, u8 value);
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_address		(struct hotplug_slot *slot, u32 *value);
static int get_latch_status	(struct hotplug_slot *slot, u8 *value);
static int get_adapter_status	(struct hotplug_slot *slot, u8 *value);

static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
	.owner			= THIS_MODULE,
	.enable_slot		= enable_slot,
	.disable_slot		= disable_slot,
	.set_attention_status	= set_attention_status,
	.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,
};


/**
 * acpiphp_register_attention - set attention LED callback
 * @info: must be completely filled with LED callbacks
 *
 * Description: This is used to register a hardware specific ACPI
 * driver that manipulates the attention LED.  All the fields in
 * info must be set.
 */
int acpiphp_register_attention(struct acpiphp_attention_info *info)
{
	int retval = -EINVAL;

	if (info && info->owner && info->set_attn &&
			info->get_attn && !attention_info) {
		retval = 0;
		attention_info = info;
	}
	return retval;
}


/**
 * acpiphp_unregister_attention - unset attention LED callback
 * @info: must match the pointer used to register
 *
 * Description: This is used to un-register a hardware specific acpi
 * driver that manipulates the attention LED.  The pointer to the 
 * info struct must be the same as the one used to set it.
 */
int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
{
	int retval = -EINVAL;

	if (info && attention_info == info) {
		attention_info = NULL;
		retval = 0;
	}
	return retval;
}


/**
 * enable_slot - power on and enable a slot
 * @hotplug_slot: slot to enable
 *
 * Actual tasks are done in acpiphp_enable_slot()
 */
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);

	/* enable the specified slot */
	return acpiphp_enable_slot(slot->acpi_slot);
}


/**
 * disable_slot - disable and power off a slot
 * @hotplug_slot: slot to disable
 *
 * Actual tasks are done in acpiphp_disable_slot()
 */
static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;
	int retval;

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

	/* disable the specified slot */
	retval = acpiphp_disable_slot(slot->acpi_slot);
	if (!retval)
		retval = acpiphp_eject_slot(slot->acpi_slot);
	return retval;
}


/**
 * set_attention_status - set attention LED
 * @hotplug_slot: slot to set attention LED on
 * @status: value to set attention LED to (0 or 1)
 *
 * attention status LED, so we use a callback that
 * was registered with us.  This allows hardware specific
 * ACPI implementations to blink the light for us.
 */
 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
 {
	int retval = -ENODEV;

 	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
 
	if (attention_info && try_module_get(attention_info->owner)) {
		retval = attention_info->set_attn(hotplug_slot, status);
		module_put(attention_info->owner);
	} else
		attention_info = NULL;
	return retval;
 }
 

/**
 * get_power_status - get power status of a slot
 * @hotplug_slot: slot to get status
 * @value: pointer to store status
 *
 * Some platforms may not implement _STA method properly.
 * In that case, the value returned may not be reliable.
 */
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

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

	*value = acpiphp_get_power_status(slot->acpi_slot);

	return 0;
}


/**
 * get_attention_status - get attention LED status
 * @hotplug_slot: slot to get status from
 * @value: returns with value of attention LED
 *
 * ACPI doesn't have known method to determine the state
 * of the attention status LED, so we use a callback that
 * was registered with us.  This allows hardware specific
 * ACPI implementations to determine its state.
 */
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	int retval = -EINVAL;

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

	if (attention_info && try_module_get(attention_info->owner)) {
		retval = attention_info->get_attn(hotplug_slot, value);
		module_put(attention_info->owner);
	} else
		attention_info = NULL;
	return retval;
}


/**
 * get_latch_status - get latch status of a slot
 * @hotplug_slot: slot to get status
 * @value: pointer to store status
 *
 * ACPI doesn't provide any formal means to access latch status.
 * Instead, we fake latch status from _STA.
 */
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

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

	*value = acpiphp_get_latch_status(slot->acpi_slot);

	return 0;
}


/**
 * get_adapter_status - get adapter status of a slot
 * @hotplug_slot: slot to get status
 * @value: pointer to store status
 *
 * ACPI doesn't provide any formal means to access adapter status.
 * Instead, we fake adapter status from _STA.
 */
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

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

	*value = acpiphp_get_adapter_status(slot->acpi_slot);

	return 0;
}


/**
 * get_address - get pci address of a slot
 * @hotplug_slot: slot to get status
 * @value: pointer to struct pci_busdev (seg, bus, dev)
 */
static int get_address(struct hotplug_slot *hotplug_slot, u32 *value)
{
	struct slot *slot = hotplug_slot->private;

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

	*value = acpiphp_get_address(slot->acpi_slot);

	return 0;
}

static int __init init_acpi(void)
{
	int retval;

	/* initialize internal data structure etc. */
	retval = acpiphp_glue_init();

	/* read initial number of slots */
	if (!retval) {
		num_slots = acpiphp_get_num_slots();
		if (num_slots == 0) {
			acpiphp_glue_exit();
			retval = -ENODEV;
		}
	}

	return retval;
}

/**
 * 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);
	kfree(slot);
}

/* callback routine to initialize 'struct slot' for each slot */
int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
{
	struct slot *slot;
	int retval = -ENOMEM;

	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot)
		goto error;

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

	slot->hotplug_slot->info = &slot->info;

	slot->hotplug_slot->name = slot->name;

	slot->hotplug_slot->private = slot;
	slot->hotplug_slot->release = &release_slot;
	slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;

	slot->acpi_slot = acpiphp_slot;
	slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
	slot->hotplug_slot->info->attention_status = 0;
	slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
	slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
	slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;

	acpiphp_slot->slot = slot;
	snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun);

	retval = pci_hp_register(slot->hotplug_slot);
	if (retval) {
		err("pci_hp_register failed with error %d\n", retval);
		goto error_hpslot;
 	}

	info("Slot [%s] registered\n", slot->hotplug_slot->name);

	return 0;
error_hpslot:
	kfree(slot->hotplug_slot);
error_slot:
	kfree(slot);
error:
	return retval;
}


void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
{
	struct slot *slot = acpiphp_slot->slot;
	int retval = 0;

	info ("Slot [%s] unregistered\n", slot->hotplug_slot->name);

	retval = pci_hp_deregister(slot->hotplug_slot);
	if (retval)
		err("pci_hp_deregister failed with error %d\n", retval);
}


static int __init acpiphp_init(void)
{
	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");

	if (acpi_pci_disabled)
		return 0;

	acpiphp_debug = debug;

	/* read all the ACPI info from the system */
	return init_acpi();
}


static void __exit acpiphp_exit(void)
{
	if (acpi_pci_disabled)
		return;

	/* deallocate internal data structures etc. */
	acpiphp_glue_exit();
}

module_init(acpiphp_init);
module_exit(acpiphp_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* ACPI PCI Hot Plug Controller Driver
	3	*
	4	* Copyright (C) 1995,2001 Compaq Computer Corporation
	5	* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
	6	* Copyright (C) 2001 IBM Corp.
	7	* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
	8	* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
	9	* Copyright (C) 2002,2003 NEC Corporation
42f49a6a RS	10	* Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
42f49a6a RS	11	* Copyright (C) 2003-2005 Hewlett Packard
1da177e4 LT	12	*
	13	* All rights reserved.
	14	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License as published by
	17	* the Free Software Foundation; either version 2 of the License, or (at
	18	* your option) any later version.
	19	*
	20	* This program is distributed in the hope that it will be useful, but
	21	* WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	23	* NON INFRINGEMENT. See the GNU General Public License for more
	24	* details.
	25	*
	26	* You should have received a copy of the GNU General Public License
	27	* along with this program; if not, write to the Free Software
	28	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	29	*
998be20f	30	* Send feedback to <kristen.c.accardi@intel.com>
1da177e4 LT	31	*
	32	*/
	33
	34	#include <linux/init.h>
	35	#include <linux/module.h>
	36	#include <linux/moduleparam.h>
	37
	38	#include <linux/kernel.h>
	39	#include <linux/pci.h>
7a54f25c	40	#include <linux/pci_hotplug.h>
1da177e4 LT	41	#include <linux/slab.h>
1da177e4 LT	42	#include <linux/smp.h>
1da177e4 LT	43	#include "acpiphp.h"
1da177e4 LT	44
1da177e4 LT	45	#define MY_NAME "acpiphp"
	46
	47	static int debug;
	48	int acpiphp_debug;
	49
	50	/* local variables */
	51	static int num_slots;
	52	static struct acpiphp_attention_info *attention_info;
	53
42f49a6a RS	54	#define DRIVER_VERSION "0.5"
42f49a6a RS	55	#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>"
1da177e4 LT	56	#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
	57
	58	MODULE_AUTHOR(DRIVER_AUTHOR);
	59	MODULE_DESCRIPTION(DRIVER_DESC);
	60	MODULE_LICENSE("GPL");
	61	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
	62	module_param(debug, bool, 0644);
	63
	64	/* export the attention callback registration methods */
	65	EXPORT_SYMBOL_GPL(acpiphp_register_attention);
	66	EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
	67
	68	static int enable_slot (struct hotplug_slot *slot);
	69	static int disable_slot (struct hotplug_slot *slot);
	70	static int set_attention_status (struct hotplug_slot *slot, u8 value);
	71	static int get_power_status (struct hotplug_slot slot, u8 value);
	72	static int get_attention_status (struct hotplug_slot slot, u8 value);
	73	static int get_address (struct hotplug_slot slot, u32 value);
	74	static int get_latch_status (struct hotplug_slot slot, u8 value);
	75	static int get_adapter_status (struct hotplug_slot slot, u8 value);
	76
	77	static struct hotplug_slot_ops acpi_hotplug_slot_ops = {
	78	.owner = THIS_MODULE,
	79	.enable_slot = enable_slot,
	80	.disable_slot = disable_slot,
	81	.set_attention_status = set_attention_status,
	82	.get_power_status = get_power_status,
	83	.get_attention_status = get_attention_status,
	84	.get_latch_status = get_latch_status,
	85	.get_adapter_status = get_adapter_status,
	86	.get_address = get_address,
	87	};
	88
	89
	90	/**
	91	* acpiphp_register_attention - set attention LED callback
	92	* @info: must be completely filled with LED callbacks
	93	*
26e6c66e	94	* Description: This is used to register a hardware specific ACPI
1da177e4 LT	95	* driver that manipulates the attention LED. All the fields in
1da177e4 LT	96	* info must be set.
26e6c66e	97	*/
1da177e4 LT	98	int acpiphp_register_attention(struct acpiphp_attention_info *info)
	99	{
	100	int retval = -EINVAL;
	101
	102	if (info && info->owner && info->set_attn &&
	103	info->get_attn && !attention_info) {
	104	retval = 0;
	105	attention_info = info;
	106	}
	107	return retval;
	108	}
	109
	110
	111	/**
	112	* acpiphp_unregister_attention - unset attention LED callback
	113	* @info: must match the pointer used to register
	114	*
26e6c66e	115	* Description: This is used to un-register a hardware specific acpi
1da177e4 LT	116	* driver that manipulates the attention LED. The pointer to the
1da177e4 LT	117	* info struct must be the same as the one used to set it.
26e6c66e	118	*/
1da177e4 LT	119	int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
	120	{
	121	int retval = -EINVAL;
	122
	123	if (info && attention_info == info) {
	124	attention_info = NULL;
	125	retval = 0;
	126	}
	127	return retval;
	128	}
	129
	130
	131	/**
	132	* enable_slot - power on and enable a slot
	133	* @hotplug_slot: slot to enable
	134	*
	135	* Actual tasks are done in acpiphp_enable_slot()
1da177e4 LT	136	*/
	137	static int enable_slot(struct hotplug_slot *hotplug_slot)
	138	{
	139	struct slot *slot = hotplug_slot->private;
	140
	141	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	142
	143	/* enable the specified slot */
	144	return acpiphp_enable_slot(slot->acpi_slot);
	145	}
	146
	147
	148	/**
	149	* disable_slot - disable and power off a slot
	150	* @hotplug_slot: slot to disable
	151	*
	152	* Actual tasks are done in acpiphp_disable_slot()
1da177e4 LT	153	*/
	154	static int disable_slot(struct hotplug_slot *hotplug_slot)
	155	{
	156	struct slot *slot = hotplug_slot->private;
bfceafc5	157	int retval;
1da177e4 LT	158
	159	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	160
	161	/* disable the specified slot */
bfceafc5 GH	162	retval = acpiphp_disable_slot(slot->acpi_slot);
	163	if (!retval)
	164	retval = acpiphp_eject_slot(slot->acpi_slot);
	165	return retval;
1da177e4 LT	166	}
	167
	168
26e6c66e RD	169	/**
26e6c66e RD	170	* set_attention_status - set attention LED
1da177e4 LT	171	* @hotplug_slot: slot to set attention LED on
	172	* @status: value to set attention LED to (0 or 1)
	173	*
	174	* attention status LED, so we use a callback that
	175	* was registered with us. This allows hardware specific
	176	* ACPI implementations to blink the light for us.
26e6c66e	177	*/
1da177e4 LT	178	static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
	179	{
	180	int retval = -ENODEV;
	181
	182	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	183
	184	if (attention_info && try_module_get(attention_info->owner)) {
	185	retval = attention_info->set_attn(hotplug_slot, status);
	186	module_put(attention_info->owner);
	187	} else
	188	attention_info = NULL;
	189	return retval;
	190	}
	191
	192
	193	/**
	194	* get_power_status - get power status of a slot
	195	* @hotplug_slot: slot to get status
	196	* @value: pointer to store status
	197	*
	198	* Some platforms may not implement _STA method properly.
	199	* In that case, the value returned may not be reliable.
1da177e4 LT	200	*/
	201	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	202	{
	203	struct slot *slot = hotplug_slot->private;
	204
	205	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	206
	207	*value = acpiphp_get_power_status(slot->acpi_slot);
	208
	209	return 0;
	210	}
	211
	212
26e6c66e	213	/**
1da177e4 LT	214	* get_attention_status - get attention LED status
	215	* @hotplug_slot: slot to get status from
	216	* @value: returns with value of attention LED
	217	*
	218	* ACPI doesn't have known method to determine the state
	219	* of the attention status LED, so we use a callback that
	220	* was registered with us. This allows hardware specific
26e6c66e RD	221	* ACPI implementations to determine its state.
26e6c66e RD	222	*/
1da177e4 LT	223	static int get_attention_status(struct hotplug_slot hotplug_slot, u8 value)
	224	{
	225	int retval = -EINVAL;
	226
	227	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	228
	229	if (attention_info && try_module_get(attention_info->owner)) {
	230	retval = attention_info->get_attn(hotplug_slot, value);
	231	module_put(attention_info->owner);
	232	} else
	233	attention_info = NULL;
	234	return retval;
	235	}
	236
	237
	238	/**
	239	* get_latch_status - get latch status of a slot
	240	* @hotplug_slot: slot to get status
	241	* @value: pointer to store status
	242	*
	243	* ACPI doesn't provide any formal means to access latch status.
26e6c66e	244	* Instead, we fake latch status from _STA.
1da177e4 LT	245	*/
	246	static int get_latch_status(struct hotplug_slot hotplug_slot, u8 value)
	247	{
	248	struct slot *slot = hotplug_slot->private;
	249
	250	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	251
	252	*value = acpiphp_get_latch_status(slot->acpi_slot);
	253
	254	return 0;
	255	}
	256
	257
	258	/**
	259	* get_adapter_status - get adapter status of a slot
	260	* @hotplug_slot: slot to get status
	261	* @value: pointer to store status
	262	*
	263	* ACPI doesn't provide any formal means to access adapter status.
26e6c66e	264	* Instead, we fake adapter status from _STA.
1da177e4 LT	265	*/
	266	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	267	{
	268	struct slot *slot = hotplug_slot->private;
	269
	270	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	271
	272	*value = acpiphp_get_adapter_status(slot->acpi_slot);
	273
	274	return 0;
	275	}
	276
	277
	278	/**
	279	* get_address - get pci address of a slot
	280	* @hotplug_slot: slot to get status
42f49a6a	281	* @value: pointer to struct pci_busdev (seg, bus, dev)
1da177e4 LT	282	*/
	283	static int get_address(struct hotplug_slot hotplug_slot, u32 value)
	284	{
	285	struct slot *slot = hotplug_slot->private;
	286
	287	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	288
	289	*value = acpiphp_get_address(slot->acpi_slot);
	290
	291	return 0;
	292	}
	293
	294	static int __init init_acpi(void)
	295	{
	296	int retval;
	297
	298	/* initialize internal data structure etc. */
	299	retval = acpiphp_glue_init();
	300
	301	/* read initial number of slots */
	302	if (!retval) {
	303	num_slots = acpiphp_get_num_slots();
0a9dee27 AM	304	if (num_slots == 0) {
0a9dee27 AM	305	acpiphp_glue_exit();
1da177e4	306	retval = -ENODEV;
0a9dee27	307	}
1da177e4 LT	308	}
	309
	310	return retval;
	311	}
	312
1da177e4 LT	313	/**
	314	* release_slot - free up the memory used by a slot
	315	* @hotplug_slot: slot to free
	316	*/
	317	static void release_slot(struct hotplug_slot *hotplug_slot)
	318	{
	319	struct slot *slot = hotplug_slot->private;
	320
	321	dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
	322
1da177e4 LT	323	kfree(slot->hotplug_slot);
	324	kfree(slot);
	325	}
	326
e27da381 MT	327	/* callback routine to initialize 'struct slot' for each slot */
e27da381 MT	328	int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
1da177e4 LT	329	{
	330	struct slot *slot;
	331	int retval = -ENOMEM;
e27da381 MT	332
	333	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	334	if (!slot)
	335	goto error;
	336
ac9e9891	337	slot->hotplug_slot = kzalloc(sizeof(*slot->hotplug_slot), GFP_KERNEL);
e27da381 MT	338	if (!slot->hotplug_slot)
	339	goto error_slot;
	340
ac9e9891	341	slot->hotplug_slot->info = &slot->info;
e27da381	342
ac9e9891	343	slot->hotplug_slot->name = slot->name;
e27da381 MT	344
	345	slot->hotplug_slot->private = slot;
	346	slot->hotplug_slot->release = &release_slot;
	347	slot->hotplug_slot->ops = &acpi_hotplug_slot_ops;
	348
	349	slot->acpi_slot = acpiphp_slot;
	350	slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot);
	351	slot->hotplug_slot->info->attention_status = 0;
	352	slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot);
	353	slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot);
	354	slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
	355	slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
	356
	357	acpiphp_slot->slot = slot;
ac9e9891	358	snprintf(slot->name, sizeof(slot->name), "%u", slot->acpi_slot->sun);
e27da381 MT	359
	360	retval = pci_hp_register(slot->hotplug_slot);
	361	if (retval) {
	362	err("pci_hp_register failed with error %d\n", retval);
ac9e9891	363	goto error_hpslot;
e27da381 MT	364	}
	365
	366	info("Slot [%s] registered\n", slot->hotplug_slot->name);
1da177e4 LT	367
1da177e4 LT	368	return 0;
1da177e4 LT	369	error_hpslot:
	370	kfree(slot->hotplug_slot);
	371	error_slot:
	372	kfree(slot);
	373	error:
	374	return retval;
	375	}
	376
	377
e27da381	378	void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
1da177e4	379	{
e27da381 MT	380	struct slot *slot = acpiphp_slot->slot;
e27da381 MT	381	int retval = 0;
1da177e4	382
e27da381 MT	383	info ("Slot [%s] unregistered\n", slot->hotplug_slot->name);
	384
	385	retval = pci_hp_deregister(slot->hotplug_slot);
	386	if (retval)
	387	err("pci_hp_deregister failed with error %d\n", retval);
1da177e4 LT	388	}
	389
	390
	391	static int __init acpiphp_init(void)
	392	{
1da177e4 LT	393	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
1da177e4 LT	394
6e4be1ff YL	395	if (acpi_pci_disabled)
	396	return 0;
	397
1da177e4 LT	398	acpiphp_debug = debug;
	399
	400	/* read all the ACPI info from the system */
4e8662bb	401	return init_acpi();
1da177e4 LT	402	}
	403
	404
	405	static void __exit acpiphp_exit(void)
	406	{
6e4be1ff YL	407	if (acpi_pci_disabled)
	408	return;
	409
1da177e4 LT	410	/* deallocate internal data structures etc. */
	411	acpiphp_glue_exit();
	412	}
	413
	414	module_init(acpiphp_init);
	415	module_exit(acpiphp_exit);