357 lines
9.9 KiB
C
357 lines
9.9 KiB
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>
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "acpiphp: " fmt
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci-acpi.h>
|
|
#include <linux/pci_hotplug.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/smp.h>
|
|
#include "acpiphp.h"
|
|
|
|
/* name size which is used for entries in pcihpfs */
|
|
#define SLOT_NAME_SIZE 21 /* {_SUN} */
|
|
|
|
bool acpiphp_disabled;
|
|
|
|
/* local variables */
|
|
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(disable, "disable acpiphp driver");
|
|
module_param_named(disable, acpiphp_disabled, bool, 0444);
|
|
|
|
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_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 = {
|
|
.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,
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpiphp_register_attention);
|
|
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
|
|
|
|
|
|
/**
|
|
* 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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
/* 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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
/* disable the specified slot */
|
|
return acpiphp_disable_slot(slot->acpi_slot);
|
|
}
|
|
|
|
|
|
/**
|
|
* 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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__,
|
|
hotplug_slot_name(hotplug_slot));
|
|
|
|
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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
*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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__,
|
|
hotplug_slot_name(hotplug_slot));
|
|
|
|
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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
*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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
*value = acpiphp_get_adapter_status(slot->acpi_slot);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
|
|
|
|
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,
|
|
unsigned int sun)
|
|
{
|
|
struct slot *slot;
|
|
int retval = -ENOMEM;
|
|
char name[SLOT_NAME_SIZE];
|
|
|
|
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->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);
|
|
|
|
acpiphp_slot->slot = slot;
|
|
slot->sun = sun;
|
|
snprintf(name, SLOT_NAME_SIZE, "%u", sun);
|
|
|
|
retval = pci_hp_register(slot->hotplug_slot, acpiphp_slot->bus,
|
|
acpiphp_slot->device, name);
|
|
if (retval == -EBUSY)
|
|
goto error_hpslot;
|
|
if (retval) {
|
|
pr_err("pci_hp_register failed with error %d\n", retval);
|
|
goto error_hpslot;
|
|
}
|
|
|
|
pr_info("Slot [%s] registered\n", slot_name(slot));
|
|
|
|
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;
|
|
|
|
pr_info("Slot [%s] unregistered\n", slot_name(slot));
|
|
|
|
retval = pci_hp_deregister(slot->hotplug_slot);
|
|
if (retval)
|
|
pr_err("pci_hp_deregister failed with error %d\n", retval);
|
|
}
|
|
|
|
|
|
void __init acpiphp_init(void)
|
|
{
|
|
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
|
|
acpiphp_disabled ? ", disabled by user; please report a bug"
|
|
: "");
|
|
}
|