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346 lines
8.5 KiB
346 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Standard 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 ([email protected]) |
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* Copyright (C) 2001 IBM Corp. |
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* Copyright (C) 2003-2004 Intel Corporation |
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* |
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* All rights reserved. |
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* |
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* Send feedback to <[email protected]>, <[email protected]> |
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* |
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*/ |
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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/types.h> |
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#include <linux/slab.h> |
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#include <linux/pci.h> |
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#include "shpchp.h" |
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/* Global variables */ |
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bool shpchp_debug; |
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bool shpchp_poll_mode; |
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int shpchp_poll_time; |
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#define DRIVER_VERSION "0.4" |
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#define DRIVER_AUTHOR "Dan Zink <[email protected]>, Greg Kroah-Hartman <[email protected]>, Dely Sy <[email protected]>" |
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#define DRIVER_DESC "Standard 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_param(shpchp_debug, bool, 0644); |
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module_param(shpchp_poll_mode, bool, 0644); |
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module_param(shpchp_poll_time, int, 0644); |
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MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not"); |
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MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); |
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MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); |
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#define SHPC_MODULE_NAME "shpchp" |
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static int set_attention_status(struct hotplug_slot *slot, u8 value); |
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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 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 shpchp_hotplug_slot_ops = { |
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.set_attention_status = set_attention_status, |
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.enable_slot = enable_slot, |
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.disable_slot = disable_slot, |
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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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static int init_slots(struct controller *ctrl) |
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{ |
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struct slot *slot; |
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struct hotplug_slot *hotplug_slot; |
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char name[SLOT_NAME_SIZE]; |
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int retval; |
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int i; |
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for (i = 0; i < ctrl->num_slots; i++) { |
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slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
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if (!slot) { |
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retval = -ENOMEM; |
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goto error; |
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} |
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hotplug_slot = &slot->hotplug_slot; |
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slot->hp_slot = i; |
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slot->ctrl = ctrl; |
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slot->bus = ctrl->pci_dev->subordinate->number; |
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slot->device = ctrl->slot_device_offset + i; |
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slot->hpc_ops = ctrl->hpc_ops; |
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slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); |
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slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number); |
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if (!slot->wq) { |
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retval = -ENOMEM; |
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goto error_slot; |
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} |
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mutex_init(&slot->lock); |
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INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); |
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/* register this slot with the hotplug pci core */ |
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snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); |
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hotplug_slot->ops = &shpchp_hotplug_slot_ops; |
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ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n", |
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pci_domain_nr(ctrl->pci_dev->subordinate), |
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slot->bus, slot->device, slot->hp_slot, slot->number, |
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ctrl->slot_device_offset); |
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retval = pci_hp_register(hotplug_slot, |
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ctrl->pci_dev->subordinate, slot->device, name); |
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if (retval) { |
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ctrl_err(ctrl, "pci_hp_register failed with error %d\n", |
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retval); |
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goto error_slotwq; |
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} |
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get_power_status(hotplug_slot, &slot->pwr_save); |
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get_attention_status(hotplug_slot, &slot->attention_save); |
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get_latch_status(hotplug_slot, &slot->latch_save); |
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get_adapter_status(hotplug_slot, &slot->presence_save); |
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list_add(&slot->slot_list, &ctrl->slot_list); |
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} |
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return 0; |
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error_slotwq: |
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destroy_workqueue(slot->wq); |
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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 cleanup_slots(struct controller *ctrl) |
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{ |
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struct slot *slot, *next; |
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list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) { |
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list_del(&slot->slot_list); |
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cancel_delayed_work(&slot->work); |
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destroy_workqueue(slot->wq); |
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pci_hp_deregister(&slot->hotplug_slot); |
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kfree(slot); |
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} |
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} |
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/* |
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* set_attention_status - Turns the Amber LED for a slot on, off or blink |
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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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struct slot *slot = get_slot(hotplug_slot); |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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slot->attention_save = status; |
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slot->hpc_ops->set_attention_status(slot, status); |
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return 0; |
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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 = get_slot(hotplug_slot); |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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return shpchp_sysfs_enable_slot(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 = get_slot(hotplug_slot); |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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return shpchp_sysfs_disable_slot(slot); |
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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 = get_slot(hotplug_slot); |
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int retval; |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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retval = slot->hpc_ops->get_power_status(slot, value); |
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if (retval < 0) |
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*value = slot->pwr_save; |
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return 0; |
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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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struct slot *slot = get_slot(hotplug_slot); |
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int retval; |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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retval = slot->hpc_ops->get_attention_status(slot, value); |
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if (retval < 0) |
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*value = slot->attention_save; |
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return 0; |
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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 = get_slot(hotplug_slot); |
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int retval; |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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retval = slot->hpc_ops->get_latch_status(slot, value); |
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if (retval < 0) |
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*value = slot->latch_save; |
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return 0; |
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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 = get_slot(hotplug_slot); |
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int retval; |
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", |
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__func__, slot_name(slot)); |
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retval = slot->hpc_ops->get_adapter_status(slot, value); |
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if (retval < 0) |
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*value = slot->presence_save; |
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return 0; |
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} |
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static bool shpc_capable(struct pci_dev *bridge) |
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{ |
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/* |
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* It is assumed that AMD GOLAM chips support SHPC but they do not |
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* have SHPC capability. |
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*/ |
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if (bridge->vendor == PCI_VENDOR_ID_AMD && |
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bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450) |
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return true; |
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if (pci_find_capability(bridge, PCI_CAP_ID_SHPC)) |
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return true; |
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return false; |
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} |
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static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) |
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{ |
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int rc; |
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struct controller *ctrl; |
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if (!shpc_capable(pdev)) |
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return -ENODEV; |
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if (acpi_get_hp_hw_control_from_firmware(pdev)) |
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return -ENODEV; |
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ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); |
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if (!ctrl) |
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goto err_out_none; |
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INIT_LIST_HEAD(&ctrl->slot_list); |
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rc = shpc_init(ctrl, pdev); |
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if (rc) { |
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ctrl_dbg(ctrl, "Controller initialization failed\n"); |
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goto err_out_free_ctrl; |
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} |
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pci_set_drvdata(pdev, ctrl); |
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/* Setup the slot information structures */ |
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rc = init_slots(ctrl); |
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if (rc) { |
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ctrl_err(ctrl, "Slot initialization failed\n"); |
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goto err_out_release_ctlr; |
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} |
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rc = shpchp_create_ctrl_files(ctrl); |
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if (rc) |
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goto err_cleanup_slots; |
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pdev->shpc_managed = 1; |
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return 0; |
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err_cleanup_slots: |
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cleanup_slots(ctrl); |
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err_out_release_ctlr: |
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ctrl->hpc_ops->release_ctlr(ctrl); |
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err_out_free_ctrl: |
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kfree(ctrl); |
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err_out_none: |
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return -ENODEV; |
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} |
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static void shpc_remove(struct pci_dev *dev) |
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{ |
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struct controller *ctrl = pci_get_drvdata(dev); |
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dev->shpc_managed = 0; |
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shpchp_remove_ctrl_files(ctrl); |
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ctrl->hpc_ops->release_ctlr(ctrl); |
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kfree(ctrl); |
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} |
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static const struct pci_device_id shpcd_pci_tbl[] = { |
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{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)}, |
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{ /* end: all zeroes */ } |
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}; |
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MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); |
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static struct pci_driver shpc_driver = { |
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.name = SHPC_MODULE_NAME, |
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.id_table = shpcd_pci_tbl, |
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.probe = shpc_probe, |
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.remove = shpc_remove, |
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}; |
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static int __init shpcd_init(void) |
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{ |
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int retval; |
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retval = pci_register_driver(&shpc_driver); |
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dbg("%s: pci_register_driver = %d\n", __func__, retval); |
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
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return retval; |
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} |
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static void __exit shpcd_cleanup(void) |
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{ |
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dbg("unload_shpchpd()\n"); |
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pci_unregister_driver(&shpc_driver); |
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info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n"); |
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} |
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module_init(shpcd_init); |
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module_exit(shpcd_cleanup);
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