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Chris Wrightc70e0d92008-11-25 21:17:13 -08001/* pci-stub - simple stub driver to reserve a pci device
2 *
3 * Copyright (C) 2008 Red Hat, Inc.
4 * Author:
Bjorn Helgaasf7625982013-11-14 11:28:18 -07005 * Chris Wright
Chris Wrightc70e0d92008-11-25 21:17:13 -08006 *
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:
Bjorn Helgaasf7625982013-11-14 11:28:18 -070011 *
Chris Wrightc70e0d92008-11-25 21:17:13 -080012 * # 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
Tejun Heob439b1d2009-09-03 15:27:27 +090022static char ids[1024] __initdata;
23
24module_param_string(ids, ids, sizeof(ids), 0);
25MODULE_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
Chris Wrightc70e0d92008-11-25 21:17:13 -080029static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
30{
Joe Perches438be3c2012-10-28 01:05:49 -070031 dev_info(&dev->dev, "claimed by stub\n");
Chris Wrightc70e0d92008-11-25 21:17:13 -080032 return 0;
33}
34
35static struct pci_driver stub_driver = {
36 .name = "pci-stub",
37 .id_table = NULL, /* only dynamic id's */
38 .probe = pci_stub_probe,
39};
40
41static int __init pci_stub_init(void)
42{
Tejun Heob439b1d2009-09-03 15:27:27 +090043 char *p, *id;
44 int rc;
45
46 rc = pci_register_driver(&stub_driver);
47 if (rc)
48 return rc;
49
Yinghai Luee8abf72010-11-17 12:10:40 -080050 /* no ids passed actually */
51 if (ids[0] == '\0')
52 return 0;
53
Tejun Heob439b1d2009-09-03 15:27:27 +090054 /* 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
Tejun Heo99a0fad2010-12-22 10:06:36 +010061 if (!strlen(id))
62 continue;
63
Tejun Heob439b1d2009-09-03 15:27:27 +090064 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;
Chris Wrightc70e0d92008-11-25 21:17:13 -080086}
87
88static void __exit pci_stub_exit(void)
89{
90 pci_unregister_driver(&stub_driver);
91}
92
93module_init(pci_stub_init);
94module_exit(pci_stub_exit);
95
96MODULE_LICENSE("GPL");
97MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");