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 22static 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 29static 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 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{ 43 char *p, *id; 44 int rc; 45 46 rc = pci_register_driver(&stub_driver); 47 if (rc) 48 return rc; 49 50 /* add ids specified in the module parameter */ 51 p = ids; 52 while ((id = strsep(&p, ","))) { 53 unsigned int vendor, device, subvendor = PCI_ANY_ID, 54 subdevice = PCI_ANY_ID, class=0, class_mask=0; 55 int fields; 56 57 if (!strlen(id)) 58 continue; 59 60 fields = sscanf(id, "%x:%x:%x:%x:%x:%x", 61 &vendor, &device, &subvendor, &subdevice, 62 &class, &class_mask); 63 64 if (fields < 2) { 65 printk(KERN_WARNING 66 "pci-stub: invalid id string \"%s\"\n", id); 67 continue; 68 } 69 70 printk(KERN_INFO 71 "pci-stub: add %04X:%04X sub=%04X:%04X cls=%08X/%08X\n", 72 vendor, device, subvendor, subdevice, class, class_mask); 73 74 rc = pci_add_dynid(&stub_driver, vendor, device, 75 subvendor, subdevice, class, class_mask, 0); 76 if (rc) 77 printk(KERN_WARNING 78 "pci-stub: failed to add dynamic id (%d)\n", rc); 79 } 80 81 return 0; 82} 83 84static void __exit pci_stub_exit(void) 85{ 86 pci_unregister_driver(&stub_driver); 87} 88 89module_init(pci_stub_init); 90module_exit(pci_stub_exit); 91 92MODULE_LICENSE("GPL"); 93MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>"); 94