[deliverable/linux.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 *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_power_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);
exit:
	return retval;
}

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 *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_attention_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf(buf, "%d\n", value);

exit:
	return retval;
}

static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
		size_t count)
{
	struct hotplug_slot_ops *ops = 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(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 *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_latch_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);

exit:
	return retval;
}

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 *slot, char *buf)
{
	int retval;
	u8 value;

	retval = get_adapter_status(slot->hotplug, &value);
	if (retval)
		goto exit;
	retval = sprintf (buf, "%d\n", value);

exit:
	return retval;
}

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 *slot)
{
	int retval = 0;

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

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

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

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

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

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

	goto exit;

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

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

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

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

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

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

	pci_hp_remove_module_link(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
 * @hotplug: 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 *hotplug)
{
	struct hotplug_slot *temp;
	struct pci_slot *slot;

	if (!hotplug)
		return -ENODEV;

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

	list_del(&hotplug->slot_list);

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

	hotplug->release(hotplug);
	slot->hotplug = NULL;
	pci_destroy_slot(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
 * @hotplug: 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 *hotplug,
			    struct hotplug_slot_info *info)
{
	if (!hotplug || !info)
		return -ENODEV;

	memcpy(hotplug->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);
		goto err_cpci;
	}

	info (DRIVER_DESC " version: " DRIVER_VERSION "\n");

err_cpci:
	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
1da177e4 LT	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	*
fb5f4d7a	24	* Send feedback to <kristen.c.accardi@intel.com>
1da177e4 LT	25	*
	26	*/
	27
1da177e4 LT	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>
7a54f25c GKH	33	#include <linux/kobject.h>
7a54f25c GKH	34	#include <linux/sysfs.h>
1da177e4	35	#include <linux/pagemap.h>
1da177e4 LT	36	#include <linux/init.h>
	37	#include <linux/mount.h>
	38	#include <linux/namei.h>
95cb9093	39	#include <linux/mutex.h>
1da177e4	40	#include <linux/pci.h>
7a54f25c	41	#include <linux/pci_hotplug.h>
1da177e4	42	#include <asm/uaccess.h>
f46753c5	43	#include "../pci.h"
c3139ba2	44	#include "cpci_hotplug.h"
1da177e4 LT	45
	46	#define MY_NAME "pci_hotplug"
	47
66bef8c0	48	#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
1da177e4 LT	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 */
90ab5ee9	55	static bool debug;
1da177e4 LT	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	//////////////////////////////////////////////////////////////////
	63
	64	static LIST_HEAD(pci_hotplug_slot_list);
95cb9093	65	static DEFINE_MUTEX(pci_hp_mutex);
1da177e4	66
1da177e4 LT	67	/* Weee, fun with macros... */
	68	#define GET_STATUS(name,type) \
	69	static int get_##name (struct hotplug_slot slot, type value) \
	70	{ \
	71	struct hotplug_slot_ops *ops = slot->ops; \
	72	int retval = 0; \
bd1d9855	73	if (!try_module_get(ops->owner)) \
c8761fe8 ZY	74	return -ENODEV; \
	75	if (ops->get_##name) \
	76	retval = ops->get_##name(slot, value); \
	77	else \
	78	*value = slot->info->name; \
	79	module_put(ops->owner); \
1da177e4 LT	80	return retval; \
	81	}
	82
	83	GET_STATUS(power_status, u8)
	84	GET_STATUS(attention_status, u8)
	85	GET_STATUS(latch_status, u8)
	86	GET_STATUS(adapter_status, u8)
1da177e4	87
f46753c5	88	static ssize_t power_read_file(struct pci_slot slot, char buf)
1da177e4 LT	89	{
	90	int retval;
	91	u8 value;
	92
f46753c5	93	retval = get_power_status(slot->hotplug, &value);
1da177e4 LT	94	if (retval)
	95	goto exit;
	96	retval = sprintf (buf, "%d\n", value);
	97	exit:
	98	return retval;
	99	}
	100
f46753c5	101	static ssize_t power_write_file(struct pci_slot pci_slot, const char buf,
1da177e4 LT	102	size_t count)
1da177e4 LT	103	{
f46753c5	104	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4 LT	105	unsigned long lpower;
	106	u8 power;
	107	int retval = 0;
	108
	109	lpower = simple_strtoul (buf, NULL, 10);
	110	power = (u8)(lpower & 0xff);
	111	dbg ("power = %d\n", power);
	112
	113	if (!try_module_get(slot->ops->owner)) {
	114	retval = -ENODEV;
	115	goto exit;
	116	}
	117	switch (power) {
	118	case 0:
	119	if (slot->ops->disable_slot)
	120	retval = slot->ops->disable_slot(slot);
	121	break;
	122
	123	case 1:
	124	if (slot->ops->enable_slot)
	125	retval = slot->ops->enable_slot(slot);
	126	break;
	127
	128	default:
	129	err ("Illegal value specified for power\n");
	130	retval = -EINVAL;
	131	}
	132	module_put(slot->ops->owner);
	133
f7625980	134	exit:
1da177e4 LT	135	if (retval)
	136	return retval;
	137	return count;
	138	}
	139
f46753c5	140	static struct pci_slot_attribute hotplug_slot_attr_power = {
1da177e4 LT	141	.attr = {.name = "power", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	142	.show = power_read_file,
	143	.store = power_write_file
	144	};
	145
f46753c5	146	static ssize_t attention_read_file(struct pci_slot slot, char buf)
1da177e4 LT	147	{
	148	int retval;
	149	u8 value;
	150
f46753c5	151	retval = get_attention_status(slot->hotplug, &value);
1da177e4 LT	152	if (retval)
1da177e4 LT	153	goto exit;
f46753c5	154	retval = sprintf(buf, "%d\n", value);
1da177e4 LT	155
	156	exit:
	157	return retval;
	158	}
	159
f46753c5	160	static ssize_t attention_write_file(struct pci_slot slot, const char buf,
1da177e4 LT	161	size_t count)
1da177e4 LT	162	{
f46753c5	163	struct hotplug_slot_ops *ops = slot->hotplug->ops;
1da177e4 LT	164	unsigned long lattention;
	165	u8 attention;
	166	int retval = 0;
	167
	168	lattention = simple_strtoul (buf, NULL, 10);
	169	attention = (u8)(lattention & 0xff);
	170	dbg (" - attention = %d\n", attention);
	171
f46753c5	172	if (!try_module_get(ops->owner)) {
1da177e4 LT	173	retval = -ENODEV;
	174	goto exit;
	175	}
f46753c5 AC	176	if (ops->set_attention_status)
	177	retval = ops->set_attention_status(slot->hotplug, attention);
	178	module_put(ops->owner);
1da177e4	179
f7625980	180	exit:
1da177e4 LT	181	if (retval)
	182	return retval;
	183	return count;
	184	}
	185
f46753c5	186	static struct pci_slot_attribute hotplug_slot_attr_attention = {
1da177e4 LT	187	.attr = {.name = "attention", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	188	.show = attention_read_file,
	189	.store = attention_write_file
	190	};
	191
f46753c5	192	static ssize_t latch_read_file(struct pci_slot slot, char buf)
1da177e4 LT	193	{
	194	int retval;
	195	u8 value;
	196
f46753c5	197	retval = get_latch_status(slot->hotplug, &value);
1da177e4 LT	198	if (retval)
	199	goto exit;
	200	retval = sprintf (buf, "%d\n", value);
	201
	202	exit:
	203	return retval;
	204	}
	205
f46753c5	206	static struct pci_slot_attribute hotplug_slot_attr_latch = {
1da177e4 LT	207	.attr = {.name = "latch", .mode = S_IFREG \| S_IRUGO},
	208	.show = latch_read_file,
	209	};
	210
f46753c5	211	static ssize_t presence_read_file(struct pci_slot slot, char buf)
1da177e4 LT	212	{
	213	int retval;
	214	u8 value;
	215
f46753c5	216	retval = get_adapter_status(slot->hotplug, &value);
1da177e4 LT	217	if (retval)
	218	goto exit;
	219	retval = sprintf (buf, "%d\n", value);
	220
	221	exit:
	222	return retval;
	223	}
	224
f46753c5	225	static struct pci_slot_attribute hotplug_slot_attr_presence = {
1da177e4 LT	226	.attr = {.name = "adapter", .mode = S_IFREG \| S_IRUGO},
	227	.show = presence_read_file,
	228	};
	229
f46753c5	230	static ssize_t test_write_file(struct pci_slot pci_slot, const char buf,
1da177e4 LT	231	size_t count)
1da177e4 LT	232	{
f46753c5	233	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4 LT	234	unsigned long ltest;
	235	u32 test;
	236	int retval = 0;
	237
	238	ltest = simple_strtoul (buf, NULL, 10);
	239	test = (u32)(ltest & 0xffffffff);
	240	dbg ("test = %d\n", test);
	241
	242	if (!try_module_get(slot->ops->owner)) {
	243	retval = -ENODEV;
	244	goto exit;
	245	}
	246	if (slot->ops->hardware_test)
	247	retval = slot->ops->hardware_test(slot, test);
	248	module_put(slot->ops->owner);
	249
f7625980	250	exit:
1da177e4 LT	251	if (retval)
	252	return retval;
	253	return count;
	254	}
	255
f46753c5	256	static struct pci_slot_attribute hotplug_slot_attr_test = {
1da177e4 LT	257	.attr = {.name = "test", .mode = S_IFREG \| S_IRUGO \| S_IWUSR},
	258	.store = test_write_file
	259	};
	260
498a8faf	261	static bool has_power_file(struct pci_slot *pci_slot)
1da177e4	262	{
f46753c5	263	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4	264	if ((!slot) \|\| (!slot->ops))
498a8faf	265	return false;
1da177e4 LT	266	if ((slot->ops->enable_slot) \|\|
	267	(slot->ops->disable_slot) \|\|
	268	(slot->ops->get_power_status))
498a8faf KK	269	return true;
498a8faf KK	270	return false;
1da177e4 LT	271	}
1da177e4 LT	272
498a8faf	273	static bool has_attention_file(struct pci_slot *pci_slot)
1da177e4	274	{
f46753c5	275	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4	276	if ((!slot) \|\| (!slot->ops))
498a8faf	277	return false;
1da177e4 LT	278	if ((slot->ops->set_attention_status) \|\|
1da177e4 LT	279	(slot->ops->get_attention_status))
498a8faf KK	280	return true;
498a8faf KK	281	return false;
1da177e4 LT	282	}
1da177e4 LT	283
498a8faf	284	static bool has_latch_file(struct pci_slot *pci_slot)
1da177e4	285	{
f46753c5	286	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4	287	if ((!slot) \|\| (!slot->ops))
498a8faf	288	return false;
1da177e4	289	if (slot->ops->get_latch_status)
498a8faf KK	290	return true;
498a8faf KK	291	return false;
1da177e4 LT	292	}
1da177e4 LT	293
498a8faf	294	static bool has_adapter_file(struct pci_slot *pci_slot)
1da177e4	295	{
f46753c5	296	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4	297	if ((!slot) \|\| (!slot->ops))
498a8faf	298	return false;
1da177e4	299	if (slot->ops->get_adapter_status)
498a8faf KK	300	return true;
498a8faf KK	301	return false;
1da177e4 LT	302	}
1da177e4 LT	303
498a8faf	304	static bool has_test_file(struct pci_slot *pci_slot)
1da177e4	305	{
f46753c5	306	struct hotplug_slot *slot = pci_slot->hotplug;
1da177e4	307	if ((!slot) \|\| (!slot->ops))
498a8faf	308	return false;
1da177e4	309	if (slot->ops->hardware_test)
498a8faf KK	310	return true;
498a8faf KK	311	return false;
1da177e4 LT	312	}
1da177e4 LT	313
f46753c5	314	static int fs_add_slot(struct pci_slot *slot)
1da177e4	315	{
660a0e8f	316	int retval = 0;
1da177e4	317
c825bc94 KK	318	/* Create symbolic link to the hotplug driver module */
	319	pci_hp_create_module_link(slot);
	320
498a8faf KK	321	if (has_power_file(slot)) {
	322	retval = sysfs_create_file(&slot->kobj,
	323	&hotplug_slot_attr_power.attr);
660a0e8f GKH	324	if (retval)
	325	goto exit_power;
	326	}
1da177e4	327
498a8faf	328	if (has_attention_file(slot)) {
660a0e8f GKH	329	retval = sysfs_create_file(&slot->kobj,
	330	&hotplug_slot_attr_attention.attr);
	331	if (retval)
	332	goto exit_attention;
	333	}
1da177e4	334
498a8faf	335	if (has_latch_file(slot)) {
660a0e8f GKH	336	retval = sysfs_create_file(&slot->kobj,
	337	&hotplug_slot_attr_latch.attr);
	338	if (retval)
	339	goto exit_latch;
	340	}
1da177e4	341
498a8faf	342	if (has_adapter_file(slot)) {
660a0e8f GKH	343	retval = sysfs_create_file(&slot->kobj,
	344	&hotplug_slot_attr_presence.attr);
	345	if (retval)
	346	goto exit_adapter;
	347	}
1da177e4	348
498a8faf	349	if (has_test_file(slot)) {
660a0e8f GKH	350	retval = sysfs_create_file(&slot->kobj,
	351	&hotplug_slot_attr_test.attr);
	352	if (retval)
	353	goto exit_test;
	354	}
	355
	356	goto exit;
	357
	358	exit_test:
498a8faf KK	359	if (has_adapter_file(slot))
	360	sysfs_remove_file(&slot->kobj,
	361	&hotplug_slot_attr_presence.attr);
660a0e8f	362	exit_adapter:
498a8faf	363	if (has_latch_file(slot))
660a0e8f	364	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
660a0e8f	365	exit_latch:
498a8faf KK	366	if (has_attention_file(slot))
	367	sysfs_remove_file(&slot->kobj,
	368	&hotplug_slot_attr_attention.attr);
660a0e8f	369	exit_attention:
498a8faf	370	if (has_power_file(slot))
660a0e8f GKH	371	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
660a0e8f GKH	372	exit_power:
c825bc94	373	pci_hp_remove_module_link(slot);
660a0e8f GKH	374	exit:
660a0e8f GKH	375	return retval;
1da177e4 LT	376	}
1da177e4 LT	377
f46753c5	378	static void fs_remove_slot(struct pci_slot *slot)
1da177e4	379	{
498a8faf	380	if (has_power_file(slot))
1da177e4 LT	381	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
1da177e4 LT	382
498a8faf KK	383	if (has_attention_file(slot))
	384	sysfs_remove_file(&slot->kobj,
	385	&hotplug_slot_attr_attention.attr);
1da177e4	386
498a8faf	387	if (has_latch_file(slot))
1da177e4 LT	388	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
1da177e4 LT	389
498a8faf KK	390	if (has_adapter_file(slot))
	391	sysfs_remove_file(&slot->kobj,
	392	&hotplug_slot_attr_presence.attr);
1da177e4	393
498a8faf	394	if (has_test_file(slot))
1da177e4	395	sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
c825bc94 KK	396
c825bc94 KK	397	pci_hp_remove_module_link(slot);
1da177e4 LT	398	}
	399
	400	static struct hotplug_slot get_slot_from_name (const char name)
	401	{
	402	struct hotplug_slot *slot;
	403	struct list_head *tmp;
	404
	405	list_for_each (tmp, &pci_hotplug_slot_list) {
	406	slot = list_entry (tmp, struct hotplug_slot, slot_list);
58319b80	407	if (strcmp(hotplug_slot_name(slot), name) == 0)
95cb9093	408	return slot;
1da177e4	409	}
95cb9093	410	return NULL;
1da177e4 LT	411	}
	412
	413	/**
c825bc94	414	* __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
65b943f6	415	* @bus: bus this slot is on
1da177e4	416	* @slot: pointer to the &struct hotplug_slot to register
c825bc94	417	* @devnr: device number
1359f270	418	* @name: name registered with kobject core
503998ca RD	419	* @owner: caller module owner
503998ca RD	420	* @mod_name: caller module name
1da177e4 LT	421	*
	422	* Registers a hotplug slot with the pci hotplug subsystem, which will allow
	423	* userspace interaction to the slot.
	424	*
	425	* Returns 0 if successful, anything else for an error.
	426	*/
c825bc94 KK	427	int __pci_hp_register(struct hotplug_slot slot, struct pci_bus bus,
	428	int devnr, const char *name,
	429	struct module owner, const char mod_name)
1da177e4 LT	430	{
1da177e4 LT	431	int result;
f46753c5	432	struct pci_slot *pci_slot;
1da177e4 LT	433
	434	if (slot == NULL)
	435	return -ENODEV;
	436	if ((slot->info == NULL) \|\| (slot->ops == NULL))
	437	return -EINVAL;
	438	if (slot->release == NULL) {
a6f29a98	439	dbg("Why are you trying to register a hotplug slot "
1da177e4 LT	440	"without a proper release function?\n");
	441	return -EINVAL;
	442	}
	443
c825bc94 KK	444	slot->ops->owner = owner;
c825bc94 KK	445	slot->ops->mod_name = mod_name;
95cb9093	446
c825bc94	447	mutex_lock(&pci_hp_mutex);
8344b568 AC	448	/*
	449	* No problems if we call this interface from both ACPI_PCI_SLOT
	450	* driver and call it here again. If we've already created the
	451	* pci_slot, the interface will simply bump the refcount.
	452	*/
c825bc94	453	pci_slot = pci_create_slot(bus, devnr, name, slot);
95cb9093 KK	454	if (IS_ERR(pci_slot)) {
95cb9093 KK	455	result = PTR_ERR(pci_slot);
5fe6cc60	456	goto out;
1da177e4	457	}
64dbcac3	458
f46753c5 AC	459	slot->pci_slot = pci_slot;
	460	pci_slot->hotplug = slot;
	461
f46753c5	462	list_add(&slot->slot_list, &pci_hotplug_slot_list);
f46753c5 AC	463
	464	result = fs_add_slot(pci_slot);
	465	kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
1359f270	466	dbg("Added slot %s to the list\n", name);
95cb9093 KK	467	out:
95cb9093 KK	468	mutex_unlock(&pci_hp_mutex);
1da177e4 LT	469	return result;
1da177e4 LT	470	}
b7fe9434	471	EXPORT_SYMBOL_GPL(__pci_hp_register);
1da177e4 LT	472
	473	/**
	474	* pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
65b943f6	475	* @hotplug: pointer to the &struct hotplug_slot to deregister
1da177e4 LT	476	*
	477	* The @slot must have been registered with the pci hotplug subsystem
	478	* previously with a call to pci_hp_register().
	479	*
	480	* Returns 0 if successful, anything else for an error.
	481	*/
f46753c5	482	int pci_hp_deregister(struct hotplug_slot *hotplug)
1da177e4 LT	483	{
1da177e4 LT	484	struct hotplug_slot *temp;
f46753c5	485	struct pci_slot *slot;
1da177e4	486
f46753c5	487	if (!hotplug)
1da177e4 LT	488	return -ENODEV;
1da177e4 LT	489
95cb9093	490	mutex_lock(&pci_hp_mutex);
58319b80	491	temp = get_slot_from_name(hotplug_slot_name(hotplug));
95cb9093 KK	492	if (temp != hotplug) {
95cb9093 KK	493	mutex_unlock(&pci_hp_mutex);
1da177e4	494	return -ENODEV;
95cb9093	495	}
1da177e4	496
f46753c5	497	list_del(&hotplug->slot_list);
f46753c5 AC	498
	499	slot = hotplug->pci_slot;
	500	fs_remove_slot(slot);
58319b80	501	dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
f46753c5 AC	502
	503	hotplug->release(hotplug);
	504	slot->hotplug = NULL;
	505	pci_destroy_slot(slot);
95cb9093	506	mutex_unlock(&pci_hp_mutex);
f46753c5	507
1da177e4 LT	508	return 0;
1da177e4 LT	509	}
b7fe9434	510	EXPORT_SYMBOL_GPL(pci_hp_deregister);
1da177e4 LT	511
	512	/**
	513	* pci_hp_change_slot_info - changes the slot's information structure in the core
65b943f6	514	* @hotplug: pointer to the slot whose info has changed
1da177e4 LT	515	* @info: pointer to the info copy into the slot's info structure
1da177e4 LT	516	*
f7625980	517	* @slot must have been registered with the pci
1da177e4 LT	518	* hotplug subsystem previously with a call to pci_hp_register().
	519	*
	520	* Returns 0 if successful, anything else for an error.
	521	*/
d67aed63 BH	522	int pci_hp_change_slot_info(struct hotplug_slot *hotplug,
d67aed63 BH	523	struct hotplug_slot_info *info)
1da177e4	524	{
f46753c5	525	if (!hotplug \|\| !info)
1da177e4 LT	526	return -ENODEV;
1da177e4 LT	527
f46753c5	528	memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
1da177e4 LT	529
	530	return 0;
	531	}
b7fe9434	532	EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
1da177e4 LT	533
	534	static int __init pci_hotplug_init (void)
	535	{
	536	int result;
0fed80f7	537
1da177e4 LT	538	result = cpci_hotplug_init(debug);
	539	if (result) {
	540	err ("cpci_hotplug_init with error %d\n", result);
f46753c5	541	goto err_cpci;
1da177e4 LT	542	}
	543
	544	info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
81ace5cd	545
f46753c5	546	err_cpci:
1da177e4 LT	547	return result;
	548	}
	549
	550	static void __exit pci_hotplug_exit (void)
	551	{
	552	cpci_hotplug_exit();
1da177e4 LT	553	}
	554
	555	module_init(pci_hotplug_init);
	556	module_exit(pci_hotplug_exit);
	557
	558	MODULE_AUTHOR(DRIVER_AUTHOR);
	559	MODULE_DESCRIPTION(DRIVER_DESC);
	560	MODULE_LICENSE("GPL");
	561	module_param(debug, bool, 0644);
	562	MODULE_PARM_DESC(debug, "Debugging mode enabled or not");