PCIe ASPM: forcedly -> forcibly
[linux-2.6.git] / drivers / pci / pci-stub.c
1 /* pci-stub - simple stub driver to reserve a pci device
2  *
3  * Copyright (C) 2008 Red Hat, Inc.
4  * Author:
5  *      Chris Wright
6  *
7  * This work is licensed under the terms of the GNU GPL, version 2.
8  *
9  * Usage is simple, allocate a new id to the stub driver and bind the
10  * device to it.  For example:
11  * 
12  * # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
13  * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
14  * # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
15  * # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
16  * .../0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub
17  */
18
19 #include <linux/module.h>
20 #include <linux/pci.h>
21
22 static char ids[1024] __initdata;
23
24 module_param_string(ids, ids, sizeof(ids), 0);
25 MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the stub driver, format is "
26                  "\"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\""
27                  " and multiple comma separated entries can be specified");
28
29 static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
30 {
31         dev_printk(KERN_INFO, &dev->dev, "claimed by stub\n");
32         return 0;
33 }
34
35 static struct pci_driver stub_driver = {
36         .name           = "pci-stub",
37         .id_table       = NULL, /* only dynamic id's */
38         .probe          = pci_stub_probe,
39 };
40
41 static int __init pci_stub_init(void)
42 {
43         char *p, *id;
44         int rc;
45
46         rc = pci_register_driver(&stub_driver);
47         if (rc)
48                 return rc;
49
50         /* no ids passed actually */
51         if (ids[0] == '\0')
52                 return 0;
53
54         /* add ids specified in the module parameter */
55         p = ids;
56         while ((id = strsep(&p, ","))) {
57                 unsigned int vendor, device, subvendor = PCI_ANY_ID,
58                         subdevice = PCI_ANY_ID, class=0, class_mask=0;
59                 int fields;
60
61                 if (!strlen(id))
62                         continue;
63
64                 fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
65                                 &vendor, &device, &subvendor, &subdevice,
66                                 &class, &class_mask);
67
68                 if (fields < 2) {
69                         printk(KERN_WARNING
70                                "pci-stub: invalid id string \"%s\"\n", id);
71                         continue;
72                 }
73
74                 printk(KERN_INFO
75                        "pci-stub: add %04X:%04X sub=%04X:%04X cls=%08X/%08X\n",
76                        vendor, device, subvendor, subdevice, class, class_mask);
77
78                 rc = pci_add_dynid(&stub_driver, vendor, device,
79                                    subvendor, subdevice, class, class_mask, 0);
80                 if (rc)
81                         printk(KERN_WARNING
82                                "pci-stub: failed to add dynamic id (%d)\n", rc);
83         }
84
85         return 0;
86 }
87
88 static void __exit pci_stub_exit(void)
89 {
90         pci_unregister_driver(&stub_driver);
91 }
92
93 module_init(pci_stub_init);
94 module_exit(pci_stub_exit);
95
96 MODULE_LICENSE("GPL");
97 MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");