2 * PCI Hot Plug Controller Skeleton Driver - 0.2
4 * Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2001,2003 IBM Corp.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or (at
12 * your option) any later version.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
17 * NON INFRINGEMENT. See the GNU General Public License for more
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * This driver is to be used as a skeleton driver to be show how to interface
25 * with the pci hotplug core easily.
27 * Send feedback to <greg@kroah.com>
31 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/kernel.h>
35 #include <linux/slab.h>
36 #include <linux/pci.h>
37 #include <linux/init.h>
38 #include "pci_hotplug.h"
42 struct hotplug_slot *hotplug_slot;
43 struct list_head slot_list;
46 static LIST_HEAD(slot_list);
48 #define MY_NAME "pcihp_skeleton"
50 #define dbg(format, arg...) \
53 printk (KERN_DEBUG "%s: " format "\n", \
56 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
57 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
58 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
66 #define DRIVER_VERSION "0.3"
67 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
68 #define DRIVER_DESC "Hot Plug PCI Controller Skeleton Driver"
70 MODULE_AUTHOR(DRIVER_AUTHOR);
71 MODULE_DESCRIPTION(DRIVER_DESC);
72 MODULE_LICENSE("GPL");
73 module_param(debug, bool, 0644);
74 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
76 static int enable_slot (struct hotplug_slot *slot);
77 static int disable_slot (struct hotplug_slot *slot);
78 static int set_attention_status (struct hotplug_slot *slot, u8 value);
79 static int hardware_test (struct hotplug_slot *slot, u32 value);
80 static int get_power_status (struct hotplug_slot *slot, u8 *value);
81 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
82 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
83 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
85 static struct hotplug_slot_ops skel_hotplug_slot_ops = {
87 .enable_slot = enable_slot,
88 .disable_slot = disable_slot,
89 .set_attention_status = set_attention_status,
90 .hardware_test = hardware_test,
91 .get_power_status = get_power_status,
92 .get_attention_status = get_attention_status,
93 .get_latch_status = get_latch_status,
94 .get_adapter_status = get_adapter_status,
97 static int enable_slot(struct hotplug_slot *hotplug_slot)
99 struct slot *slot = hotplug_slot->private;
102 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
105 * Fill in code here to enable the specified slot
112 static int disable_slot(struct hotplug_slot *hotplug_slot)
114 struct slot *slot = hotplug_slot->private;
117 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
120 * Fill in code here to disable the specified slot
126 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
128 struct slot *slot = hotplug_slot->private;
131 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
136 * Fill in code here to turn light off
143 * Fill in code here to turn light on
151 static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
153 struct slot *slot = hotplug_slot->private;
156 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
160 /* Specify a test here */
163 /* Specify another test here */
170 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
172 struct slot *slot = hotplug_slot->private;
175 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
178 * Fill in logic to get the current power status of the specific
179 * slot and store it in the *value location.
185 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
187 struct slot *slot = hotplug_slot->private;
190 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
193 * Fill in logic to get the current attention status of the specific
194 * slot and store it in the *value location.
200 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
202 struct slot *slot = hotplug_slot->private;
205 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
208 * Fill in logic to get the current latch status of the specific
209 * slot and store it in the *value location.
215 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
217 struct slot *slot = hotplug_slot->private;
220 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
223 * Fill in logic to get the current adapter status of the specific
224 * slot and store it in the *value location.
230 static void release_slot(struct hotplug_slot *hotplug_slot)
232 struct slot *slot = hotplug_slot->private;
234 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
235 kfree(slot->hotplug_slot->info);
236 kfree(slot->hotplug_slot->name);
237 kfree(slot->hotplug_slot);
241 #define SLOT_NAME_SIZE 10
242 static void make_slot_name(struct slot *slot)
245 * Stupid way to make a filename out of the slot name.
246 * replace this if your hardware provides a better way to name slots.
248 snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%d", slot->number);
252 * init_slots - initialize 'struct slot' structures for each slot
255 static int __init init_slots(void)
258 struct hotplug_slot *hotplug_slot;
259 struct hotplug_slot_info *info;
261 int retval = -ENOMEM;
265 * Create a structure for each slot, and register that slot
266 * with the pci_hotplug subsystem.
268 for (i = 0; i < num_slots; ++i) {
269 slot = kmalloc(sizeof(struct slot), GFP_KERNEL);
272 memset(slot, 0, sizeof(struct slot));
274 hotplug_slot = kmalloc(sizeof(struct hotplug_slot),
278 memset(hotplug_slot, 0, sizeof (struct hotplug_slot));
279 slot->hotplug_slot = hotplug_slot;
281 info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
284 memset(info, 0, sizeof (struct hotplug_slot_info));
285 hotplug_slot->info = info;
287 name = kmalloc(SLOT_NAME_SIZE, GFP_KERNEL);
290 hotplug_slot->name = name;
294 hotplug_slot->private = slot;
295 hotplug_slot->release = &release_slot;
296 make_slot_name(slot);
297 hotplug_slot->ops = &skel_hotplug_slot_ops;
300 * Initialize the slot info structure with some known
303 info->power_status = get_power_status(slot);
304 info->attention_status = get_attention_status(slot);
305 info->latch_status = get_latch_status(slot);
306 info->adapter_status = get_adapter_status(slot);
308 dbg("registering slot %d\n", i);
309 retval = pci_hp_register(slot->hotplug_slot);
311 err("pci_hp_register failed with error %d\n", retval);
315 /* add slot to our internal list */
316 list_add(&slot->slot_list, &slot_list);
332 static void __exit cleanup_slots(void)
334 struct list_head *tmp;
335 struct list_head *next;
339 * Unregister all of our slots with the pci_hotplug subsystem.
340 * Memory will be freed in release_slot() callback after slot's
341 * lifespan is finished.
343 list_for_each_safe(tmp, next, &slot_list) {
344 slot = list_entry(tmp, struct slot, slot_list);
345 list_del(&slot->slot_list);
346 pci_hp_deregister(slot->hotplug_slot);
350 static int __init pcihp_skel_init(void)
354 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
356 * Do specific initialization stuff for your driver here
357 * Like initializing your controller hardware (if any) and
358 * determining the number of slots you have in the system
366 static void __exit pcihp_skel_exit(void)
369 * Clean everything up.
374 module_init(pcihp_skel_init);
375 module_exit(pcihp_skel_exit);