360 lines
8.7 KiB
C
360 lines
8.7 KiB
C
/*
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* PCI Hot Plug Controller Skeleton Driver - 0.3
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*
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* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001,2003 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* This driver is to be used as a skeleton driver to show how to interface
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* with the pci hotplug core easily.
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*
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* Send feedback to <greg@kroah.com>
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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/slab.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/init.h>
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#define SLOT_NAME_SIZE 10
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struct slot {
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u8 number;
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struct hotplug_slot *hotplug_slot;
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struct list_head slot_list;
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char name[SLOT_NAME_SIZE];
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};
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static LIST_HEAD(slot_list);
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#define MY_NAME "pcihp_skeleton"
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#define dbg(format, arg...) \
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do { \
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if (debug) \
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printk (KERN_DEBUG "%s: " format "\n", \
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MY_NAME , ## arg); \
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} while (0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
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/* local variables */
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static bool debug;
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static int num_slots;
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#define DRIVER_VERSION "0.3"
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
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#define DRIVER_DESC "Hot Plug PCI Controller Skeleton 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(debug, bool, 0644);
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MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
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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 hardware_test (struct hotplug_slot *slot, u32 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 struct hotplug_slot_ops skel_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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.hardware_test = hardware_test,
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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 enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in code here to enable the specified slot
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*/
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in code here to disable the specified slot
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*/
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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switch (status) {
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case 0:
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/*
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* Fill in code here to turn light off
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*/
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break;
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case 1:
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default:
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/*
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* Fill in code here to turn light on
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*/
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break;
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}
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return retval;
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}
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static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
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{
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struct slot *slot = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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switch (value) {
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case 0:
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/* Specify a test here */
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break;
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case 1:
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/* Specify another test here */
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break;
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}
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in logic to get the current power status of the specific
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* slot and store it in the *value location.
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*/
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in logic to get the current attention status of the specific
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* slot and store it in the *value location.
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*/
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in logic to get the current latch status of the specific
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* slot and store it in the *value location.
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*/
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return retval;
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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 = hotplug_slot->private;
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int retval = 0;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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/*
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* Fill in logic to get the current adapter status of the specific
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* slot and store it in the *value location.
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*/
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return retval;
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}
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static void release_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = hotplug_slot->private;
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dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
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kfree(slot->hotplug_slot->info);
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kfree(slot->hotplug_slot);
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kfree(slot);
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}
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static void make_slot_name(struct slot *slot)
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{
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/*
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* Stupid way to make a filename out of the slot name.
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* replace this if your hardware provides a better way to name slots.
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*/
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snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", slot->number);
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}
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/**
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* init_slots - initialize 'struct slot' structures for each slot
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*
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*/
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static int __init init_slots(void)
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{
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struct slot *slot;
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struct hotplug_slot *hotplug_slot;
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struct hotplug_slot_info *info;
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int retval = -ENOMEM;
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int i;
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/*
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* Create a structure for each slot, and register that slot
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* with the pci_hotplug subsystem.
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*/
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for (i = 0; i < num_slots; ++i) {
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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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hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
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if (!hotplug_slot)
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goto error_slot;
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slot->hotplug_slot = hotplug_slot;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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goto error_hpslot;
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hotplug_slot->info = info;
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slot->number = i;
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hotplug_slot->name = slot->name;
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hotplug_slot->private = slot;
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hotplug_slot->release = &release_slot;
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make_slot_name(slot);
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hotplug_slot->ops = &skel_hotplug_slot_ops;
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/*
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* Initialize the slot info structure with some known
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* good values.
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*/
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get_power_status(hotplug_slot, &info->power_status);
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get_attention_status(hotplug_slot, &info->attention_status);
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get_latch_status(hotplug_slot, &info->latch_status);
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get_adapter_status(hotplug_slot, &info->adapter_status);
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dbg("registering slot %d\n", i);
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retval = pci_hp_register(slot->hotplug_slot);
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if (retval) {
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err("pci_hp_register failed with error %d\n", retval);
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goto error_info;
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}
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/* add slot to our internal list */
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list_add(&slot->slot_list, &slot_list);
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}
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return 0;
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error_info:
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kfree(info);
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error_hpslot:
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kfree(hotplug_slot);
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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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static void __exit cleanup_slots(void)
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{
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struct list_head *tmp;
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struct list_head *next;
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struct slot *slot;
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/*
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* Unregister all of our slots with the pci_hotplug subsystem.
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* Memory will be freed in release_slot() callback after slot's
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* lifespan is finished.
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*/
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list_for_each_safe(tmp, next, &slot_list) {
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slot = list_entry(tmp, struct slot, slot_list);
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list_del(&slot->slot_list);
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pci_hp_deregister(slot->hotplug_slot);
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}
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}
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static int __init pcihp_skel_init(void)
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{
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int retval;
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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/*
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* Do specific initialization stuff for your driver here
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* like initializing your controller hardware (if any) and
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* determining the number of slots you have in the system
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* right now.
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*/
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num_slots = 5;
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return init_slots();
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}
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static void __exit pcihp_skel_exit(void)
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{
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/*
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* Clean everything up.
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*/
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cleanup_slots();
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}
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module_init(pcihp_skel_init);
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module_exit(pcihp_skel_exit);
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