forked from Minki/linux
7a54f25cef
This makes it possible to build pci hotplug drivers outside of the main kernel tree, and Sam keeps telling me to move local header files to their proper places... Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
361 lines
8.8 KiB
C
361 lines
8.8 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 int 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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.owner = THIS_MODULE,
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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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__, 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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