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"
40 #define SLOT_NAME_SIZE 10
43 struct hotplug_slot *hotplug_slot;
44 struct list_head slot_list;
45 char name[SLOT_NAME_SIZE];
48 static LIST_HEAD(slot_list);
50 #define MY_NAME "pcihp_skeleton"
52 #define dbg(format, arg...) \
55 printk (KERN_DEBUG "%s: " format "\n", \
58 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
59 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
60 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
68 #define DRIVER_VERSION "0.3"
69 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
70 #define DRIVER_DESC "Hot Plug PCI Controller Skeleton Driver"
72 MODULE_AUTHOR(DRIVER_AUTHOR);
73 MODULE_DESCRIPTION(DRIVER_DESC);
74 MODULE_LICENSE("GPL");
75 module_param(debug, bool, 0644);
76 MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
78 static int enable_slot (struct hotplug_slot *slot);
79 static int disable_slot (struct hotplug_slot *slot);
80 static int set_attention_status (struct hotplug_slot *slot, u8 value);
81 static int hardware_test (struct hotplug_slot *slot, u32 value);
82 static int get_power_status (struct hotplug_slot *slot, u8 *value);
83 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
84 static int get_latch_status (struct hotplug_slot *slot, u8 *value);
85 static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
87 static struct hotplug_slot_ops skel_hotplug_slot_ops = {
89 .enable_slot = enable_slot,
90 .disable_slot = disable_slot,
91 .set_attention_status = set_attention_status,
92 .hardware_test = hardware_test,
93 .get_power_status = get_power_status,
94 .get_attention_status = get_attention_status,
95 .get_latch_status = get_latch_status,
96 .get_adapter_status = get_adapter_status,
99 static int enable_slot(struct hotplug_slot *hotplug_slot)
101 struct slot *slot = hotplug_slot->private;
104 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
107 * Fill in code here to enable the specified slot
114 static int disable_slot(struct hotplug_slot *hotplug_slot)
116 struct slot *slot = hotplug_slot->private;
119 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
122 * Fill in code here to disable the specified slot
128 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
130 struct slot *slot = hotplug_slot->private;
133 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
138 * Fill in code here to turn light off
145 * Fill in code here to turn light on
153 static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
155 struct slot *slot = hotplug_slot->private;
158 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
162 /* Specify a test here */
165 /* Specify another test here */
172 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
174 struct slot *slot = hotplug_slot->private;
177 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
180 * Fill in logic to get the current power status of the specific
181 * slot and store it in the *value location.
187 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
189 struct slot *slot = hotplug_slot->private;
192 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
195 * Fill in logic to get the current attention status of the specific
196 * slot and store it in the *value location.
202 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
204 struct slot *slot = hotplug_slot->private;
207 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
210 * Fill in logic to get the current latch status of the specific
211 * slot and store it in the *value location.
217 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
219 struct slot *slot = hotplug_slot->private;
222 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
225 * Fill in logic to get the current adapter status of the specific
226 * slot and store it in the *value location.
232 static void release_slot(struct hotplug_slot *hotplug_slot)
234 struct slot *slot = hotplug_slot->private;
236 dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name);
237 kfree(slot->hotplug_slot->info);
238 kfree(slot->hotplug_slot);
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;
260 int retval = -ENOMEM;
264 * Create a structure for each slot, and register that slot
265 * with the pci_hotplug subsystem.
267 for (i = 0; i < num_slots; ++i) {
268 slot = kzalloc(sizeof(*slot), GFP_KERNEL);
272 hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
275 slot->hotplug_slot = hotplug_slot;
277 info = kzalloc(sizeof(*info), GFP_KERNEL);
280 hotplug_slot->info = info;
284 hotplug_slot->name = slot->name;
285 hotplug_slot->private = slot;
286 hotplug_slot->release = &release_slot;
287 make_slot_name(slot);
288 hotplug_slot->ops = &skel_hotplug_slot_ops;
291 * Initialize the slot info structure with some known
294 get_power_status(hotplug_slot, &info->power_status);
295 get_attention_status(hotplug_slot, &info->attention_status);
296 get_latch_status(hotplug_slot, &info->latch_status);
297 get_adapter_status(hotplug_slot, &info->adapter_status);
299 dbg("registering slot %d\n", i);
300 retval = pci_hp_register(slot->hotplug_slot);
302 err("pci_hp_register failed with error %d\n", retval);
306 /* add slot to our internal list */
307 list_add(&slot->slot_list, &slot_list);
321 static void __exit cleanup_slots(void)
323 struct list_head *tmp;
324 struct list_head *next;
328 * Unregister all of our slots with the pci_hotplug subsystem.
329 * Memory will be freed in release_slot() callback after slot's
330 * lifespan is finished.
332 list_for_each_safe(tmp, next, &slot_list) {
333 slot = list_entry(tmp, struct slot, slot_list);
334 list_del(&slot->slot_list);
335 pci_hp_deregister(slot->hotplug_slot);
339 static int __init pcihp_skel_init(void)
343 info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
345 * Do specific initialization stuff for your driver here
346 * Like initializing your controller hardware (if any) and
347 * determining the number of slots you have in the system
355 static void __exit pcihp_skel_exit(void)
358 * Clean everything up.
363 module_init(pcihp_skel_init);
364 module_exit(pcihp_skel_exit);