[mirror_ubuntu-zesty-kernel.git] / drivers / pci / hotplug / pci_hotplug_core.c

/*
 * PCI HotPlug Controller Core
 *
 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
 * Copyright (C) 2001-2002 IBM Corp.
 *
 * 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/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/uaccess.h>
#include "../pci.h"
#include "cpci_hotplug.h"

#define MY_NAME	"pci_hotplug"

#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)


/* local variables */
static bool debug;

#define DRIVER_VERSION	"0.5"
#define DRIVER_AUTHOR	"Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
#define DRIVER_DESC	"PCI Hot Plug PCI Core"


static LIST_HEAD(pci_hotplug_slot_list);
static DEFINE_MUTEX(pci_hp_mutex);

/* Weee, fun with macros... */
#define GET_STATUS(name, type)	\
static int get_##name(struct hotplug_slot *slot, type *value)		\
{									\
	struct hotplug_slot_ops *ops = slot->ops;			\
	int retval = 0;							\
	if (!try_module_get(ops->owner))				\
		return -ENODEV;						\
	if (ops->get_##name)						\
		retval = ops->get_##name(slot, value);			\
	else								\
		*value = slot->info->name;				\
	module_put(ops->owner);						\
	return retval;							\
}

GET_STATUS(power_status, u8)
GET_STATUS(attention_status, u8)
GET_STATUS(latch_status, u8)
GET_STATUS(adapter_status, u8)

static ssize_t power_read_file(struct pci_slot *pci_slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_power_status(pci_slot->hotplug, &value);
	if (retval)
		return retval;

	return sprintf(buf, "%d\n", value);
}

static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
				size_t count)
{
	struct hotplug_slot *slot = pci_slot->hotplug;
	unsigned long lpower;
	u8 power;
	int retval = 0;

	lpower = simple_strtoul(buf, NULL, 10);
	power = (u8)(lpower & 0xff);
	dbg("power = %d\n", power);

	if (!try_module_get(slot->ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	switch (power) {
	case 0:
		if (slot->ops->disable_slot)
			retval = slot->ops->disable_slot(slot);
		break;

	case 1:
		if (slot->ops->enable_slot)
			retval = slot->ops->enable_slot(slot);
		break;

	default:
		err("Illegal value specified for power\n");
		retval = -EINVAL;
	}
	module_put(slot->ops->owner);

exit:
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_power = {
	.attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.show = power_read_file,
	.store = power_write_file
};

static ssize_t attention_read_file(struct pci_slot *pci_slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_attention_status(pci_slot->hotplug, &value);
	if (retval)
		return retval;

	return sprintf(buf, "%d\n", value);
}

static ssize_t attention_write_file(struct pci_slot *pci_slot, const char *buf,
				    size_t count)
{
	struct hotplug_slot_ops *ops = pci_slot->hotplug->ops;
	unsigned long lattention;
	u8 attention;
	int retval = 0;

	lattention = simple_strtoul(buf, NULL, 10);
	attention = (u8)(lattention & 0xff);
	dbg(" - attention = %d\n", attention);

	if (!try_module_get(ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	if (ops->set_attention_status)
		retval = ops->set_attention_status(pci_slot->hotplug, attention);
	module_put(ops->owner);

exit:
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_attention = {
	.attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.show = attention_read_file,
	.store = attention_write_file
};

static ssize_t latch_read_file(struct pci_slot *pci_slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_latch_status(pci_slot->hotplug, &value);
	if (retval)
		return retval;

	return sprintf(buf, "%d\n", value);
}

static struct pci_slot_attribute hotplug_slot_attr_latch = {
	.attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
	.show = latch_read_file,
};

static ssize_t presence_read_file(struct pci_slot *pci_slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_adapter_status(pci_slot->hotplug, &value);
	if (retval)
		return retval;

	return sprintf(buf, "%d\n", value);
}

static struct pci_slot_attribute hotplug_slot_attr_presence = {
	.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
	.show = presence_read_file,
};

static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
			       size_t count)
{
	struct hotplug_slot *slot = pci_slot->hotplug;
	unsigned long ltest;
	u32 test;
	int retval = 0;

	ltest = simple_strtoul (buf, NULL, 10);
	test = (u32)(ltest & 0xffffffff);
	dbg("test = %d\n", test);

	if (!try_module_get(slot->ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	if (slot->ops->hardware_test)
		retval = slot->ops->hardware_test(slot, test);
	module_put(slot->ops->owner);

exit:
	if (retval)
		return retval;
	return count;
}

static struct pci_slot_attribute hotplug_slot_attr_test = {
	.attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.store = test_write_file
};

static bool has_power_file(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;

	if ((!slot) || (!slot->ops))
		return false;
	if ((slot->ops->enable_slot) ||
	    (slot->ops->disable_slot) ||
	    (slot->ops->get_power_status))
		return true;
	return false;
}

static bool has_attention_file(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;

	if ((!slot) || (!slot->ops))
		return false;
	if ((slot->ops->set_attention_status) ||
	    (slot->ops->get_attention_status))
		return true;
	return false;
}

static bool has_latch_file(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;

	if ((!slot) || (!slot->ops))
		return false;
	if (slot->ops->get_latch_status)
		return true;
	return false;
}

static bool has_adapter_file(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;

	if ((!slot) || (!slot->ops))
		return false;
	if (slot->ops->get_adapter_status)
		return true;
	return false;
}

static bool has_test_file(struct pci_slot *pci_slot)
{
	struct hotplug_slot *slot = pci_slot->hotplug;

	if ((!slot) || (!slot->ops))
		return false;
	if (slot->ops->hardware_test)
		return true;
	return false;
}

static int fs_add_slot(struct pci_slot *pci_slot)
{
	int retval = 0;

	/* Create symbolic link to the hotplug driver module */
	pci_hp_create_module_link(pci_slot);

	if (has_power_file(pci_slot)) {
		retval = sysfs_create_file(&pci_slot->kobj,
					   &hotplug_slot_attr_power.attr);
		if (retval)
			goto exit_power;
	}

	if (has_attention_file(pci_slot)) {
		retval = sysfs_create_file(&pci_slot->kobj,
					   &hotplug_slot_attr_attention.attr);
		if (retval)
			goto exit_attention;
	}

	if (has_latch_file(pci_slot)) {
		retval = sysfs_create_file(&pci_slot->kobj,
					   &hotplug_slot_attr_latch.attr);
		if (retval)
			goto exit_latch;
	}

	if (has_adapter_file(pci_slot)) {
		retval = sysfs_create_file(&pci_slot->kobj,
					   &hotplug_slot_attr_presence.attr);
		if (retval)
			goto exit_adapter;
	}

	if (has_test_file(pci_slot)) {
		retval = sysfs_create_file(&pci_slot->kobj,
					   &hotplug_slot_attr_test.attr);
		if (retval)
			goto exit_test;
	}

	goto exit;

exit_test:
	if (has_adapter_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj,
				  &hotplug_slot_attr_presence.attr);
exit_adapter:
	if (has_latch_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
exit_latch:
	if (has_attention_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj,
				  &hotplug_slot_attr_attention.attr);
exit_attention:
	if (has_power_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
exit_power:
	pci_hp_remove_module_link(pci_slot);
exit:
	return retval;
}

static void fs_remove_slot(struct pci_slot *pci_slot)
{
	if (has_power_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);

	if (has_attention_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj,
				  &hotplug_slot_attr_attention.attr);

	if (has_latch_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);

	if (has_adapter_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj,
				  &hotplug_slot_attr_presence.attr);

	if (has_test_file(pci_slot))
		sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_test.attr);

	pci_hp_remove_module_link(pci_slot);
}

static struct hotplug_slot *get_slot_from_name(const char *name)
{
	struct hotplug_slot *slot;
	struct list_head *tmp;

	list_for_each(tmp, &pci_hotplug_slot_list) {
		slot = list_entry(tmp, struct hotplug_slot, slot_list);
		if (strcmp(hotplug_slot_name(slot), name) == 0)
			return slot;
	}
	return NULL;
}

/**
 * __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
 * @bus: bus this slot is on
 * @slot: pointer to the &struct hotplug_slot to register
 * @devnr: device number
 * @name: name registered with kobject core
 * @owner: caller module owner
 * @mod_name: caller module name
 *
 * Registers a hotplug slot with the pci hotplug subsystem, which will allow
 * userspace interaction to the slot.
 *
 * Returns 0 if successful, anything else for an error.
 */
int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
		      int devnr, const char *name,
		      struct module *owner, const char *mod_name)
{
	int result;
	struct pci_slot *pci_slot;

	if (slot == NULL)
		return -ENODEV;
	if ((slot->info == NULL) || (slot->ops == NULL))
		return -EINVAL;
	if (slot->release == NULL) {
		dbg("Why are you trying to register a hotplug slot without a proper release function?\n");
		return -EINVAL;
	}

	slot->ops->owner = owner;
	slot->ops->mod_name = mod_name;

	mutex_lock(&pci_hp_mutex);
	/*
	 * No problems if we call this interface from both ACPI_PCI_SLOT
	 * driver and call it here again. If we've already created the
	 * pci_slot, the interface will simply bump the refcount.
	 */
	pci_slot = pci_create_slot(bus, devnr, name, slot);
	if (IS_ERR(pci_slot)) {
		result = PTR_ERR(pci_slot);
		goto out;
	}

	slot->pci_slot = pci_slot;
	pci_slot->hotplug = slot;

	list_add(&slot->slot_list, &pci_hotplug_slot_list);

	result = fs_add_slot(pci_slot);
	kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
	dbg("Added slot %s to the list\n", name);
out:
	mutex_unlock(&pci_hp_mutex);
	return result;
}
EXPORT_SYMBOL_GPL(__pci_hp_register);

/**
 * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
 * @slot: pointer to the &struct hotplug_slot to deregister
 *
 * The @slot must have been registered with the pci hotplug subsystem
 * previously with a call to pci_hp_register().
 *
 * Returns 0 if successful, anything else for an error.
 */
int pci_hp_deregister(struct hotplug_slot *slot)
{
	struct hotplug_slot *temp;
	struct pci_slot *pci_slot;

	if (!slot)
		return -ENODEV;

	mutex_lock(&pci_hp_mutex);
	temp = get_slot_from_name(hotplug_slot_name(slot));
	if (temp != slot) {
		mutex_unlock(&pci_hp_mutex);
		return -ENODEV;
	}

	list_del(&slot->slot_list);

	pci_slot = slot->pci_slot;
	fs_remove_slot(pci_slot);
	dbg("Removed slot %s from the list\n", hotplug_slot_name(slot));

	slot->release(slot);
	pci_slot->hotplug = NULL;
	pci_destroy_slot(pci_slot);
	mutex_unlock(&pci_hp_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(pci_hp_deregister);

/**
 * pci_hp_change_slot_info - changes the slot's information structure in the core
 * @slot: pointer to the slot whose info has changed
 * @info: pointer to the info copy into the slot's info structure
 *
 * @slot must have been registered with the pci
 * hotplug subsystem previously with a call to pci_hp_register().
 *
 * Returns 0 if successful, anything else for an error.
 */
int pci_hp_change_slot_info(struct hotplug_slot *slot,
			    struct hotplug_slot_info *info)
{
	if (!slot || !info)
		return -ENODEV;

	memcpy(slot->info, info, sizeof(struct hotplug_slot_info));

	return 0;
}
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);

static int __init pci_hotplug_init(void)
{
	int result;

	result = cpci_hotplug_init(debug);
	if (result) {
		err("cpci_hotplug_init with error %d\n", result);
		return result;
	}

	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	return result;
}

static void __exit pci_hotplug_exit(void)
{
	cpci_hotplug_exit();
}

module_init(pci_hotplug_init);
module_exit(pci_hotplug_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
Commit	Line	Data
	1	/*
	2	* PCI HotPlug Controller Core
	3	*
	4	* Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
	5	* Copyright (C) 2001-2002 IBM Corp.
	6	*
	7	* All rights reserved.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	17	* NON INFRINGEMENT. See the GNU General Public License for more
	18	* details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*
	24	* Send feedback to <kristen.c.accardi@intel.com>
	25	*
	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/moduleparam.h>
	30	#include <linux/kernel.h>
	31	#include <linux/types.h>
	32	#include <linux/list.h>
	33	#include <linux/kobject.h>
	34	#include <linux/sysfs.h>
	35	#include <linux/pagemap.h>
	36	#include <linux/init.h>
	37	#include <linux/mount.h>
	38	#include <linux/namei.h>
	39	#include <linux/mutex.h>
	40	#include <linux/pci.h>
	41	#include <linux/pci_hotplug.h>
	42	#include <asm/uaccess.h>
	43	#include "../pci.h"
	44	#include "cpci_hotplug.h"
	45
	46	#define MY_NAME "pci_hotplug"
	47
	48	#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
	49	#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
	50	#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
	51	#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
	52
	53
	54	/* local variables */
	55	static bool debug;
	56
	57	#define DRIVER_VERSION "0.5"
	58	#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
	59	#define DRIVER_DESC "PCI Hot Plug PCI Core"
	60
	61
	62	static LIST_HEAD(pci_hotplug_slot_list);
	63	static DEFINE_MUTEX(pci_hp_mutex);
	64
	65	/* Weee, fun with macros... */
	66	#define GET_STATUS(name, type) \
	67	static int get_##name(struct hotplug_slot slot, type value) \
	68	{ \
	69	struct hotplug_slot_ops *ops = slot->ops; \
	70	int retval = 0; \
	71	if (!try_module_get(ops->owner)) \
	72	return -ENODEV; \
	73	if (ops->get_##name) \
	74	retval = ops->get_##name(slot, value); \
	75	else \
	76	*value = slot->info->name; \
	77	module_put(ops->owner); \
	78	return retval; \
	79	}
	80
	81	GET_STATUS(power_status, u8)
	82	GET_STATUS(attention_status, u8)
	83	GET_STATUS(latch_status, u8)
	84	GET_STATUS(adapter_status, u8)
	85
	86	static ssize_t power_read_file(struct pci_slot pci_slot, char buf)
	87	{
	88	int retval;
	89	u8 value;
	90
	91	retval = get_power_status(pci_slot->hotplug, &value);
	92	if (retval)
	93	return retval;
	94
	95	return sprintf(buf, "%d\n", value);
	96	}
	97
	98	static ssize_t power_write_file(struct pci_slot pci_slot, const char buf,
	99	size_t count)
	100	{
	101	struct hotplug_slot *slot = pci_slot->hotplug;
	102	unsigned long lpower;
	103	u8 power;
	104	int retval = 0;
	105
	106	lpower = simple_strtoul(buf, NULL, 10);
	107	power = (u8)(lpower & 0xff);
	108	dbg("power = %d\n", power);
	109
	110	if (!try_module_get(slot->ops->owner)) {
	111	retval = -ENODEV;
	112	goto exit;
	113	}
	114	switch (power) {
	115	case 0:
	116	if (slot->ops->disable_slot)
	117	retval = slot->ops->disable_slot(slot);
	118	break;
	119
	120	case 1:
	121	if (slot->ops->enable_slot)
	122	retval = slot->ops->enable_slot(slot);
	123	break;
	124
	125	default:
	126	err("Illegal value specified for power\n");
	127	retval = -EINVAL;
	128	}
	129	module_put(slot->ops->owner);
	130
	131	exit:
	132	if (retval)
	133	return retval;
	134	return count;
	135	}
	136
	137	static struct pci_slot_attribute hotplug_slot_attr_power = {
	138	.attr = {.name = "power", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	139	.show = power_read_file,
	140	.store = power_write_file
	141	};
	142
	143	static ssize_t attention_read_file(struct pci_slot pci_slot, char buf)
	144	{
	145	int retval;
	146	u8 value;
	147
	148	retval = get_attention_status(pci_slot->hotplug, &value);
	149	if (retval)
	150	return retval;
	151
	152	return sprintf(buf, "%d\n", value);
	153	}
	154
	155	static ssize_t attention_write_file(struct pci_slot pci_slot, const char buf,
	156	size_t count)
	157	{
	158	struct hotplug_slot_ops *ops = pci_slot->hotplug->ops;
	159	unsigned long lattention;
	160	u8 attention;
	161	int retval = 0;
	162
	163	lattention = simple_strtoul(buf, NULL, 10);
	164	attention = (u8)(lattention & 0xff);
	165	dbg(" - attention = %d\n", attention);
	166
	167	if (!try_module_get(ops->owner)) {
	168	retval = -ENODEV;
	169	goto exit;
	170	}
	171	if (ops->set_attention_status)
	172	retval = ops->set_attention_status(pci_slot->hotplug, attention);
	173	module_put(ops->owner);
	174
	175	exit:
	176	if (retval)
	177	return retval;
	178	return count;
	179	}
	180
	181	static struct pci_slot_attribute hotplug_slot_attr_attention = {
	182	.attr = {.name = "attention", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	183	.show = attention_read_file,
	184	.store = attention_write_file
	185	};
	186
	187	static ssize_t latch_read_file(struct pci_slot pci_slot, char buf)
	188	{
	189	int retval;
	190	u8 value;
	191
	192	retval = get_latch_status(pci_slot->hotplug, &value);
	193	if (retval)
	194	return retval;
	195
	196	return sprintf(buf, "%d\n", value);
	197	}
	198
	199	static struct pci_slot_attribute hotplug_slot_attr_latch = {
	200	.attr = {.name = "latch", .mode = S_IFREG \| S_IRUGO},
	201	.show = latch_read_file,
	202	};
	203
	204	static ssize_t presence_read_file(struct pci_slot pci_slot, char buf)
	205	{
	206	int retval;
	207	u8 value;
	208
	209	retval = get_adapter_status(pci_slot->hotplug, &value);
	210	if (retval)
	211	return retval;
	212
	213	return sprintf(buf, "%d\n", value);
	214	}
	215
	216	static struct pci_slot_attribute hotplug_slot_attr_presence = {
	217	.attr = {.name = "adapter", .mode = S_IFREG \| S_IRUGO},
	218	.show = presence_read_file,
	219	};
	220
	221	static ssize_t test_write_file(struct pci_slot pci_slot, const char buf,
	222	size_t count)
	223	{
	224	struct hotplug_slot *slot = pci_slot->hotplug;
	225	unsigned long ltest;
	226	u32 test;
	227	int retval = 0;
	228
	229	ltest = simple_strtoul (buf, NULL, 10);
	230	test = (u32)(ltest & 0xffffffff);
	231	dbg("test = %d\n", test);
	232
	233	if (!try_module_get(slot->ops->owner)) {
	234	retval = -ENODEV;
	235	goto exit;
	236	}
	237	if (slot->ops->hardware_test)
	238	retval = slot->ops->hardware_test(slot, test);
	239	module_put(slot->ops->owner);
	240
	241	exit:
	242	if (retval)
	243	return retval;
	244	return count;
	245	}
	246
	247	static struct pci_slot_attribute hotplug_slot_attr_test = {
	248	.attr = {.name = "test", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	249	.store = test_write_file
	250	};
	251
	252	static bool has_power_file(struct pci_slot *pci_slot)
	253	{
	254	struct hotplug_slot *slot = pci_slot->hotplug;
	255
	256	if ((!slot) \|\| (!slot->ops))
	257	return false;
	258	if ((slot->ops->enable_slot) \|\|
	259	(slot->ops->disable_slot) \|\|
	260	(slot->ops->get_power_status))
	261	return true;
	262	return false;
	263	}
	264
	265	static bool has_attention_file(struct pci_slot *pci_slot)
	266	{
	267	struct hotplug_slot *slot = pci_slot->hotplug;
	268
	269	if ((!slot) \|\| (!slot->ops))
	270	return false;
	271	if ((slot->ops->set_attention_status) \|\|
	272	(slot->ops->get_attention_status))
	273	return true;
	274	return false;
	275	}
	276
	277	static bool has_latch_file(struct pci_slot *pci_slot)
	278	{
	279	struct hotplug_slot *slot = pci_slot->hotplug;
	280
	281	if ((!slot) \|\| (!slot->ops))
	282	return false;
	283	if (slot->ops->get_latch_status)
	284	return true;
	285	return false;
	286	}
	287
	288	static bool has_adapter_file(struct pci_slot *pci_slot)
	289	{
	290	struct hotplug_slot *slot = pci_slot->hotplug;
	291
	292	if ((!slot) \|\| (!slot->ops))
	293	return false;
	294	if (slot->ops->get_adapter_status)
	295	return true;
	296	return false;
	297	}
	298
	299	static bool has_test_file(struct pci_slot *pci_slot)
	300	{
	301	struct hotplug_slot *slot = pci_slot->hotplug;
	302
	303	if ((!slot) \|\| (!slot->ops))
	304	return false;
	305	if (slot->ops->hardware_test)
	306	return true;
	307	return false;
	308	}
	309
	310	static int fs_add_slot(struct pci_slot *pci_slot)
	311	{
	312	int retval = 0;
	313
	314	/* Create symbolic link to the hotplug driver module */
	315	pci_hp_create_module_link(pci_slot);
	316
	317	if (has_power_file(pci_slot)) {
	318	retval = sysfs_create_file(&pci_slot->kobj,
	319	&hotplug_slot_attr_power.attr);
	320	if (retval)
	321	goto exit_power;
	322	}
	323
	324	if (has_attention_file(pci_slot)) {
	325	retval = sysfs_create_file(&pci_slot->kobj,
	326	&hotplug_slot_attr_attention.attr);
	327	if (retval)
	328	goto exit_attention;
	329	}
	330
	331	if (has_latch_file(pci_slot)) {
	332	retval = sysfs_create_file(&pci_slot->kobj,
	333	&hotplug_slot_attr_latch.attr);
	334	if (retval)
	335	goto exit_latch;
	336	}
	337
	338	if (has_adapter_file(pci_slot)) {
	339	retval = sysfs_create_file(&pci_slot->kobj,
	340	&hotplug_slot_attr_presence.attr);
	341	if (retval)
	342	goto exit_adapter;
	343	}
	344
	345	if (has_test_file(pci_slot)) {
	346	retval = sysfs_create_file(&pci_slot->kobj,
	347	&hotplug_slot_attr_test.attr);
	348	if (retval)
	349	goto exit_test;
	350	}
	351
	352	goto exit;
	353
	354	exit_test:
	355	if (has_adapter_file(pci_slot))
	356	sysfs_remove_file(&pci_slot->kobj,
	357	&hotplug_slot_attr_presence.attr);
	358	exit_adapter:
	359	if (has_latch_file(pci_slot))
	360	sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
	361	exit_latch:
	362	if (has_attention_file(pci_slot))
	363	sysfs_remove_file(&pci_slot->kobj,
	364	&hotplug_slot_attr_attention.attr);
	365	exit_attention:
	366	if (has_power_file(pci_slot))
	367	sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
	368	exit_power:
	369	pci_hp_remove_module_link(pci_slot);
	370	exit:
	371	return retval;
	372	}
	373
	374	static void fs_remove_slot(struct pci_slot *pci_slot)
	375	{
	376	if (has_power_file(pci_slot))
	377	sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_power.attr);
	378
	379	if (has_attention_file(pci_slot))
	380	sysfs_remove_file(&pci_slot->kobj,
	381	&hotplug_slot_attr_attention.attr);
	382
	383	if (has_latch_file(pci_slot))
	384	sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_latch.attr);
	385
	386	if (has_adapter_file(pci_slot))
	387	sysfs_remove_file(&pci_slot->kobj,
	388	&hotplug_slot_attr_presence.attr);
	389
	390	if (has_test_file(pci_slot))
	391	sysfs_remove_file(&pci_slot->kobj, &hotplug_slot_attr_test.attr);
	392
	393	pci_hp_remove_module_link(pci_slot);
	394	}
	395
	396	static struct hotplug_slot get_slot_from_name(const char name)
	397	{
	398	struct hotplug_slot *slot;
	399	struct list_head *tmp;
	400
	401	list_for_each(tmp, &pci_hotplug_slot_list) {
	402	slot = list_entry(tmp, struct hotplug_slot, slot_list);
	403	if (strcmp(hotplug_slot_name(slot), name) == 0)
	404	return slot;
	405	}
	406	return NULL;
	407	}
	408
	409	/**
	410	* __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
	411	* @bus: bus this slot is on
	412	* @slot: pointer to the &struct hotplug_slot to register
	413	* @devnr: device number
	414	* @name: name registered with kobject core
	415	* @owner: caller module owner
	416	* @mod_name: caller module name
	417	*
	418	* Registers a hotplug slot with the pci hotplug subsystem, which will allow
	419	* userspace interaction to the slot.
	420	*
	421	* Returns 0 if successful, anything else for an error.
	422	*/
	423	int __pci_hp_register(struct hotplug_slot slot, struct pci_bus bus,
	424	int devnr, const char *name,
	425	struct module owner, const char mod_name)
	426	{
	427	int result;
	428	struct pci_slot *pci_slot;
	429
	430	if (slot == NULL)
	431	return -ENODEV;
	432	if ((slot->info == NULL) \|\| (slot->ops == NULL))
	433	return -EINVAL;
	434	if (slot->release == NULL) {
	435	dbg("Why are you trying to register a hotplug slot without a proper release function?\n");
	436	return -EINVAL;
	437	}
	438
	439	slot->ops->owner = owner;
	440	slot->ops->mod_name = mod_name;
	441
	442	mutex_lock(&pci_hp_mutex);
	443	/*
	444	* No problems if we call this interface from both ACPI_PCI_SLOT
	445	* driver and call it here again. If we've already created the
	446	* pci_slot, the interface will simply bump the refcount.
	447	*/
	448	pci_slot = pci_create_slot(bus, devnr, name, slot);
	449	if (IS_ERR(pci_slot)) {
	450	result = PTR_ERR(pci_slot);
	451	goto out;
	452	}
	453
	454	slot->pci_slot = pci_slot;
	455	pci_slot->hotplug = slot;
	456
	457	list_add(&slot->slot_list, &pci_hotplug_slot_list);
	458
	459	result = fs_add_slot(pci_slot);
	460	kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
	461	dbg("Added slot %s to the list\n", name);
	462	out:
	463	mutex_unlock(&pci_hp_mutex);
	464	return result;
	465	}
	466	EXPORT_SYMBOL_GPL(__pci_hp_register);
	467
	468	/**
	469	* pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
	470	* @slot: pointer to the &struct hotplug_slot to deregister
	471	*
	472	* The @slot must have been registered with the pci hotplug subsystem
	473	* previously with a call to pci_hp_register().
	474	*
	475	* Returns 0 if successful, anything else for an error.
	476	*/
	477	int pci_hp_deregister(struct hotplug_slot *slot)
	478	{
	479	struct hotplug_slot *temp;
	480	struct pci_slot *pci_slot;
	481
	482	if (!slot)
	483	return -ENODEV;
	484
	485	mutex_lock(&pci_hp_mutex);
	486	temp = get_slot_from_name(hotplug_slot_name(slot));
	487	if (temp != slot) {
	488	mutex_unlock(&pci_hp_mutex);
	489	return -ENODEV;
	490	}
	491
	492	list_del(&slot->slot_list);
	493
	494	pci_slot = slot->pci_slot;
	495	fs_remove_slot(pci_slot);
	496	dbg("Removed slot %s from the list\n", hotplug_slot_name(slot));
	497
	498	slot->release(slot);
	499	pci_slot->hotplug = NULL;
	500	pci_destroy_slot(pci_slot);
	501	mutex_unlock(&pci_hp_mutex);
	502
	503	return 0;
	504	}
	505	EXPORT_SYMBOL_GPL(pci_hp_deregister);
	506
	507	/**
	508	* pci_hp_change_slot_info - changes the slot's information structure in the core
	509	* @slot: pointer to the slot whose info has changed
	510	* @info: pointer to the info copy into the slot's info structure
	511	*
	512	* @slot must have been registered with the pci
	513	* hotplug subsystem previously with a call to pci_hp_register().
	514	*
	515	* Returns 0 if successful, anything else for an error.
	516	*/
	517	int pci_hp_change_slot_info(struct hotplug_slot *slot,
	518	struct hotplug_slot_info *info)
	519	{
	520	if (!slot \|\| !info)
	521	return -ENODEV;
	522
	523	memcpy(slot->info, info, sizeof(struct hotplug_slot_info));
	524
	525	return 0;
	526	}
	527	EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
	528
	529	static int __init pci_hotplug_init(void)
	530	{
	531	int result;
	532
	533	result = cpci_hotplug_init(debug);
	534	if (result) {
	535	err("cpci_hotplug_init with error %d\n", result);
	536	return result;
	537	}
	538
	539	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
	540	return result;
	541	}
	542
	543	static void __exit pci_hotplug_exit(void)
	544	{
	545	cpci_hotplug_exit();
	546	}
	547
	548	module_init(pci_hotplug_init);
	549	module_exit(pci_hotplug_exit);
	550
	551	MODULE_AUTHOR(DRIVER_AUTHOR);
	552	MODULE_DESCRIPTION(DRIVER_DESC);
	553	MODULE_LICENSE("GPL");
	554	module_param(debug, bool, 0644);
	555	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");