313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* ACPI PCI Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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* Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
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* Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
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* Copyright (C) 2002,2003 NEC Corporation
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* Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org)
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* Copyright (C) 2003-2005 Hewlett Packard
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*
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* All rights reserved.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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#define pr_fmt(fmt) "acpiphp: " fmt
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci-acpi.h>
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#include <linux/pci_hotplug.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include "acpiphp.h"
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/* name size which is used for entries in pcihpfs */
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#define SLOT_NAME_SIZE 21 /* {_SUN} */
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bool acpiphp_disabled;
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/* local variables */
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static struct acpiphp_attention_info *attention_info;
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#define DRIVER_VERSION "0.5"
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@infradead.org>"
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#define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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MODULE_PARM_DESC(disable, "disable acpiphp driver");
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module_param_named(disable, acpiphp_disabled, bool, 0444);
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static int enable_slot(struct hotplug_slot *slot);
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static int disable_slot(struct hotplug_slot *slot);
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static int set_attention_status(struct hotplug_slot *slot, u8 value);
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static int get_power_status(struct hotplug_slot *slot, u8 *value);
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static int get_attention_status(struct hotplug_slot *slot, u8 *value);
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static int get_latch_status(struct hotplug_slot *slot, u8 *value);
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static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
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static const struct hotplug_slot_ops acpi_hotplug_slot_ops = {
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.set_attention_status = set_attention_status,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_latch_status = get_latch_status,
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.get_adapter_status = get_adapter_status,
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};
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/**
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* acpiphp_register_attention - set attention LED callback
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* @info: must be completely filled with LED callbacks
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*
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* Description: This is used to register a hardware specific ACPI
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* driver that manipulates the attention LED. All the fields in
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* info must be set.
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*/
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int acpiphp_register_attention(struct acpiphp_attention_info *info)
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{
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int retval = -EINVAL;
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if (info && info->owner && info->set_attn &&
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info->get_attn && !attention_info) {
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retval = 0;
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attention_info = info;
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(acpiphp_register_attention);
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/**
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* acpiphp_unregister_attention - unset attention LED callback
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* @info: must match the pointer used to register
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*
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* Description: This is used to un-register a hardware specific acpi
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* driver that manipulates the attention LED. The pointer to the
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* info struct must be the same as the one used to set it.
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*/
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int acpiphp_unregister_attention(struct acpiphp_attention_info *info)
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{
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int retval = -EINVAL;
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if (info && attention_info == info) {
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attention_info = NULL;
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retval = 0;
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}
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return retval;
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}
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EXPORT_SYMBOL_GPL(acpiphp_unregister_attention);
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/**
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* enable_slot - power on and enable a slot
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* @hotplug_slot: slot to enable
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*
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* Actual tasks are done in acpiphp_enable_slot()
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*/
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static int enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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/* enable the specified slot */
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return acpiphp_enable_slot(slot->acpi_slot);
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}
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/**
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* disable_slot - disable and power off a slot
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* @hotplug_slot: slot to disable
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*
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* Actual tasks are done in acpiphp_disable_slot()
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*/
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static int disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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/* disable the specified slot */
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return acpiphp_disable_slot(slot->acpi_slot);
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}
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/**
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* set_attention_status - set attention LED
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* @hotplug_slot: slot to set attention LED on
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* @status: value to set attention LED to (0 or 1)
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*
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* attention status LED, so we use a callback that
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* was registered with us. This allows hardware specific
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* ACPI implementations to blink the light for us.
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*/
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static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
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{
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int retval = -ENODEV;
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pr_debug("%s - physical_slot = %s\n", __func__,
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hotplug_slot_name(hotplug_slot));
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if (attention_info && try_module_get(attention_info->owner)) {
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retval = attention_info->set_attn(hotplug_slot, status);
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module_put(attention_info->owner);
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} else
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attention_info = NULL;
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return retval;
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}
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/**
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* get_power_status - get power status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* Some platforms may not implement _STA method properly.
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* In that case, the value returned may not be reliable.
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*/
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static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_power_status(slot->acpi_slot);
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return 0;
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}
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/**
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* get_attention_status - get attention LED status
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* @hotplug_slot: slot to get status from
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* @value: returns with value of attention LED
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*
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* ACPI doesn't have known method to determine the state
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* of the attention status LED, so we use a callback that
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* was registered with us. This allows hardware specific
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* ACPI implementations to determine its state.
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*/
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static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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int retval = -EINVAL;
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pr_debug("%s - physical_slot = %s\n", __func__,
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hotplug_slot_name(hotplug_slot));
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if (attention_info && try_module_get(attention_info->owner)) {
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retval = attention_info->get_attn(hotplug_slot, value);
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module_put(attention_info->owner);
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} else
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attention_info = NULL;
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return retval;
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}
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/**
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* get_latch_status - get latch status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* ACPI doesn't provide any formal means to access latch status.
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* Instead, we fake latch status from _STA.
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*/
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static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_latch_status(slot->acpi_slot);
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return 0;
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}
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/**
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* get_adapter_status - get adapter status of a slot
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* @hotplug_slot: slot to get status
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* @value: pointer to store status
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*
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* ACPI doesn't provide any formal means to access adapter status.
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* Instead, we fake adapter status from _STA.
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*/
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static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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pr_debug("%s - physical_slot = %s\n", __func__, slot_name(slot));
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*value = acpiphp_get_adapter_status(slot->acpi_slot);
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return 0;
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}
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/* callback routine to initialize 'struct slot' for each slot */
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int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot,
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unsigned int sun)
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{
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struct slot *slot;
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int retval = -ENOMEM;
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char name[SLOT_NAME_SIZE];
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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goto error;
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slot->hotplug_slot.ops = &acpi_hotplug_slot_ops;
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slot->acpi_slot = acpiphp_slot;
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acpiphp_slot->slot = slot;
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slot->sun = sun;
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snprintf(name, SLOT_NAME_SIZE, "%u", sun);
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retval = pci_hp_register(&slot->hotplug_slot, acpiphp_slot->bus,
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acpiphp_slot->device, name);
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if (retval == -EBUSY)
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goto error_slot;
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if (retval) {
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pr_err("pci_hp_register failed with error %d\n", retval);
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goto error_slot;
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}
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pr_info("Slot [%s] registered\n", slot_name(slot));
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return 0;
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error_slot:
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kfree(slot);
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error:
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return retval;
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}
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void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot)
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{
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struct slot *slot = acpiphp_slot->slot;
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pr_info("Slot [%s] unregistered\n", slot_name(slot));
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pci_hp_deregister(&slot->hotplug_slot);
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kfree(slot);
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}
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void __init acpiphp_init(void)
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{
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pr_info(DRIVER_DESC " version: " DRIVER_VERSION "%s\n",
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acpiphp_disabled ? ", disabled by user; please report a bug"
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: "");
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}
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