--- /dev/null
+/*
+ * 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"
+ : "");
+}
Code Review / kvmfornfv.git / blobdiff