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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | /* Works like the fakephp driver used to, except a little better.
*
* - It's possible to remove devices with subordinate busses.
* - New PCI devices that appear via any method, not just a fakephp triggered
* rescan, will be noticed.
* - Devices that are removed via any method, not just a fakephp triggered
* removal, will also be noticed.
*
* Uses nothing from the pci-hotplug subsystem.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/device.h>
#include "../pci.h"
struct legacy_slot {
struct kobject kobj;
struct pci_dev *dev;
struct list_head list;
};
static LIST_HEAD(legacy_list);
static ssize_t legacy_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
strcpy(buf, "1\n");
return 2;
}
static void remove_callback(void *data)
{
pci_remove_bus_device((struct pci_dev *)data);
}
static ssize_t legacy_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t len)
{
struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
unsigned long val;
if (strict_strtoul(buf, 0, &val) < 0)
return -EINVAL;
if (val)
pci_rescan_bus(slot->dev->bus);
else
sysfs_schedule_callback(&slot->dev->dev.kobj, remove_callback,
slot->dev, THIS_MODULE);
return len;
}
static struct attribute *legacy_attrs[] = {
&(struct attribute){ .name = "power", .mode = 0644 },
NULL,
};
static void legacy_release(struct kobject *kobj)
{
struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
pci_dev_put(slot->dev);
kfree(slot);
}
static struct kobj_type legacy_ktype = {
.sysfs_ops = &(struct sysfs_ops){
.store = legacy_store, .show = legacy_show
},
.release = &legacy_release,
.default_attrs = legacy_attrs,
};
static int legacy_add_slot(struct pci_dev *pdev)
{
struct legacy_slot *slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot)
return -ENOMEM;
if (kobject_init_and_add(&slot->kobj, &legacy_ktype,
&pci_slots_kset->kobj, "%s",
dev_name(&pdev->dev))) {
dev_warn(&pdev->dev, "Failed to created legacy fake slot\n");
return -EINVAL;
}
slot->dev = pci_dev_get(pdev);
list_add(&slot->list, &legacy_list);
return 0;
}
static int legacy_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct pci_dev *pdev = to_pci_dev(data);
if (action == BUS_NOTIFY_ADD_DEVICE) {
legacy_add_slot(pdev);
} else if (action == BUS_NOTIFY_DEL_DEVICE) {
struct legacy_slot *slot;
list_for_each_entry(slot, &legacy_list, list)
if (slot->dev == pdev)
goto found;
dev_warn(&pdev->dev, "Missing legacy fake slot?");
return -ENODEV;
found:
kobject_del(&slot->kobj);
list_del(&slot->list);
kobject_put(&slot->kobj);
}
return 0;
}
static struct notifier_block legacy_notifier = {
.notifier_call = legacy_notify
};
static int __init init_legacy(void)
{
struct pci_dev *pdev = NULL;
/* Add existing devices */
while ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pdev)))
legacy_add_slot(pdev);
/* Be alerted of any new ones */
bus_register_notifier(&pci_bus_type, &legacy_notifier);
return 0;
}
module_init(init_legacy);
static void __exit remove_legacy(void)
{
struct legacy_slot *slot, *tmp;
bus_unregister_notifier(&pci_bus_type, &legacy_notifier);
list_for_each_entry_safe(slot, tmp, &legacy_list, list) {
list_del(&slot->list);
kobject_del(&slot->kobj);
kobject_put(&slot->kobj);
}
}
module_exit(remove_legacy);
MODULE_AUTHOR("Trent Piepho <xyzzy@speakeasy.org>");
MODULE_DESCRIPTION("Legacy version of the fakephp interface");
MODULE_LICENSE("GPL");
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