365 lines
8.8 KiB
C
365 lines
8.8 KiB
C
/*
|
|
* PCI Hot Plug Controller Skeleton Driver - 0.3
|
|
*
|
|
* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
|
|
* Copyright (C) 2001,2003 IBM Corp.
|
|
*
|
|
* 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.
|
|
*
|
|
* This driver is to be used as a skeleton driver to show how to interface
|
|
* with the pci hotplug core easily.
|
|
*
|
|
* Send feedback to <greg@kroah.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_hotplug.h>
|
|
#include <linux/init.h>
|
|
|
|
#define SLOT_NAME_SIZE 10
|
|
struct slot {
|
|
u8 number;
|
|
struct hotplug_slot *hotplug_slot;
|
|
struct list_head slot_list;
|
|
char name[SLOT_NAME_SIZE];
|
|
};
|
|
|
|
static LIST_HEAD(slot_list);
|
|
|
|
#define MY_NAME "pcihp_skeleton"
|
|
|
|
#define dbg(format, arg...) \
|
|
do { \
|
|
if (debug) \
|
|
printk(KERN_DEBUG "%s: " format "\n", \
|
|
MY_NAME , ## arg); \
|
|
} while (0)
|
|
#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
|
|
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
|
|
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
|
|
|
|
/* local variables */
|
|
static bool debug;
|
|
static int num_slots;
|
|
|
|
#define DRIVER_VERSION "0.3"
|
|
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
|
|
#define DRIVER_DESC "Hot Plug PCI Controller Skeleton Driver"
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
module_param(debug, bool, 0644);
|
|
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
|
|
|
|
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 hardware_test (struct hotplug_slot *slot, u32 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 skel_hotplug_slot_ops = {
|
|
.enable_slot = enable_slot,
|
|
.disable_slot = disable_slot,
|
|
.set_attention_status = set_attention_status,
|
|
.hardware_test = hardware_test,
|
|
.get_power_status = get_power_status,
|
|
.get_attention_status = get_attention_status,
|
|
.get_latch_status = get_latch_status,
|
|
.get_adapter_status = get_adapter_status,
|
|
};
|
|
|
|
static int enable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in code here to enable the specified slot
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int disable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in code here to disable the specified slot
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
switch (status) {
|
|
case 0:
|
|
/*
|
|
* Fill in code here to turn light off
|
|
*/
|
|
break;
|
|
|
|
case 1:
|
|
default:
|
|
/*
|
|
* Fill in code here to turn light on
|
|
*/
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
switch (value) {
|
|
case 0:
|
|
/* Specify a test here */
|
|
break;
|
|
case 1:
|
|
/* Specify another test here */
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in logic to get the current power status of the specific
|
|
* slot and store it in the *value location.
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in logic to get the current attention status of the specific
|
|
* slot and store it in the *value location.
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in logic to get the current latch status of the specific
|
|
* slot and store it in the *value location.
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
int retval = 0;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
|
|
/*
|
|
* Fill in logic to get the current adapter status of the specific
|
|
* slot and store it in the *value location.
|
|
*/
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void release_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
struct slot *slot = hotplug_slot->private;
|
|
|
|
dbg("%s - physical_slot = %s\n", __func__, hotplug_slot->name);
|
|
kfree(slot->hotplug_slot->info);
|
|
kfree(slot->hotplug_slot);
|
|
kfree(slot);
|
|
}
|
|
|
|
static void make_slot_name(struct slot *slot)
|
|
{
|
|
/*
|
|
* Stupid way to make a filename out of the slot name.
|
|
* replace this if your hardware provides a better way to name slots.
|
|
*/
|
|
snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", slot->number);
|
|
}
|
|
|
|
/**
|
|
* init_slots - initialize 'struct slot' structures for each slot
|
|
*
|
|
*/
|
|
static int __init init_slots(void)
|
|
{
|
|
struct slot *slot;
|
|
struct hotplug_slot *hotplug_slot;
|
|
struct hotplug_slot_info *info;
|
|
int retval;
|
|
int i;
|
|
|
|
/*
|
|
* Create a structure for each slot, and register that slot
|
|
* with the pci_hotplug subsystem.
|
|
*/
|
|
for (i = 0; i < num_slots; ++i) {
|
|
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
|
|
if (!slot) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
|
|
if (!hotplug_slot) {
|
|
retval = -ENOMEM;
|
|
goto error_slot;
|
|
}
|
|
slot->hotplug_slot = hotplug_slot;
|
|
|
|
info = kzalloc(sizeof(*info), GFP_KERNEL);
|
|
if (!info) {
|
|
retval = -ENOMEM;
|
|
goto error_hpslot;
|
|
}
|
|
hotplug_slot->info = info;
|
|
|
|
slot->number = i;
|
|
|
|
hotplug_slot->name = slot->name;
|
|
hotplug_slot->private = slot;
|
|
hotplug_slot->release = &release_slot;
|
|
make_slot_name(slot);
|
|
hotplug_slot->ops = &skel_hotplug_slot_ops;
|
|
|
|
/*
|
|
* Initialize the slot info structure with some known
|
|
* good values.
|
|
*/
|
|
get_power_status(hotplug_slot, &info->power_status);
|
|
get_attention_status(hotplug_slot, &info->attention_status);
|
|
get_latch_status(hotplug_slot, &info->latch_status);
|
|
get_adapter_status(hotplug_slot, &info->adapter_status);
|
|
|
|
dbg("registering slot %d\n", i);
|
|
retval = pci_hp_register(slot->hotplug_slot);
|
|
if (retval) {
|
|
err("pci_hp_register failed with error %d\n", retval);
|
|
goto error_info;
|
|
}
|
|
|
|
/* add slot to our internal list */
|
|
list_add(&slot->slot_list, &slot_list);
|
|
}
|
|
|
|
return 0;
|
|
error_info:
|
|
kfree(info);
|
|
error_hpslot:
|
|
kfree(hotplug_slot);
|
|
error_slot:
|
|
kfree(slot);
|
|
error:
|
|
return retval;
|
|
}
|
|
|
|
static void __exit cleanup_slots(void)
|
|
{
|
|
struct list_head *tmp;
|
|
struct list_head *next;
|
|
struct slot *slot;
|
|
|
|
/*
|
|
* Unregister all of our slots with the pci_hotplug subsystem.
|
|
* Memory will be freed in release_slot() callback after slot's
|
|
* lifespan is finished.
|
|
*/
|
|
list_for_each_safe(tmp, next, &slot_list) {
|
|
slot = list_entry(tmp, struct slot, slot_list);
|
|
list_del(&slot->slot_list);
|
|
pci_hp_deregister(slot->hotplug_slot);
|
|
}
|
|
}
|
|
|
|
static int __init pcihp_skel_init(void)
|
|
{
|
|
int retval;
|
|
|
|
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
/*
|
|
* Do specific initialization stuff for your driver here
|
|
* like initializing your controller hardware (if any) and
|
|
* determining the number of slots you have in the system
|
|
* right now.
|
|
*/
|
|
num_slots = 5;
|
|
|
|
return init_slots();
|
|
}
|
|
|
|
static void __exit pcihp_skel_exit(void)
|
|
{
|
|
/*
|
|
* Clean everything up.
|
|
*/
|
|
cleanup_slots();
|
|
}
|
|
|
|
module_init(pcihp_skel_init);
|
|
module_exit(pcihp_skel_exit);
|