pci_hotplug_core.c

h内核

	enum pci_bus_speed value;

	retval = get_cur_bus_speed (slot, &value);
	if (retval)
		goto exit;

	if (value == PCI_SPEED_UNKNOWN)
		speed_string = unknown_speed;
	else
		speed_string = pci_bus_speed_strings[value];
	
	retval = sprintf (buf, "%s\n", speed_string);

exit:
	return retval;
}

static struct hotplug_slot_attribute hotplug_slot_attr_cur_bus_speed = {
	.attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
	.show = cur_bus_speed_read_file,
};

static ssize_t test_write_file (struct hotplug_slot *slot, const char *buf,
		size_t count)
{
	unsigned long ltest;
	u32 test;
	int retval = 0;

	ltest = simple_strtoul (buf, NULL, 10);
	test = (u32)(ltest & 0xffffffff);
	dbg ("test = %d\n", test);

	if (!try_module_get(slot->ops->owner)) {
		retval = -ENODEV;
		goto exit;
	}
	if (slot->ops->hardware_test)
		retval = slot->ops->hardware_test(slot, test);
	module_put(slot->ops->owner);

exit:	
	if (retval)
		return retval;
	return count;
}

static struct hotplug_slot_attribute hotplug_slot_attr_test = {
	.attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
	.store = test_write_file
};

static int has_power_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if ((slot->ops->enable_slot) ||
	    (slot->ops->disable_slot) ||
	    (slot->ops->get_power_status))
		return 0;
	return -ENOENT;
}

static int has_attention_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if ((slot->ops->set_attention_status) ||
	    (slot->ops->get_attention_status))
		return 0;
	return -ENOENT;
}

static int has_latch_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->get_latch_status)
		return 0;
	return -ENOENT;
}

static int has_adapter_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->get_adapter_status)
		return 0;
	return -ENOENT;
}

static int has_address_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->get_address)
		return 0;
	return -ENOENT;
}

static int has_max_bus_speed_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->get_max_bus_speed)
		return 0;
	return -ENOENT;
}

static int has_cur_bus_speed_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->get_cur_bus_speed)
		return 0;
	return -ENOENT;
}

static int has_test_file (struct hotplug_slot *slot)
{
	if ((!slot) || (!slot->ops))
		return -ENODEV;
	if (slot->ops->hardware_test)
		return 0;
	return -ENOENT;
}

static int fs_add_slot (struct hotplug_slot *slot)
{
	if (has_power_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);

	if (has_attention_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_attention.attr);

	if (has_latch_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_latch.attr);

	if (has_adapter_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_presence.attr);

	if (has_address_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_address.attr);

	if (has_max_bus_speed_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);

	if (has_cur_bus_speed_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);

	if (has_test_file(slot) == 0)
		sysfs_create_file(&slot->kobj, &hotplug_slot_attr_test.attr);

	return 0;
}

static void fs_remove_slot (struct hotplug_slot *slot)
{
	if (has_power_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);

	if (has_attention_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);

	if (has_latch_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);

	if (has_adapter_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);

	if (has_address_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_address.attr);

	if (has_max_bus_speed_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);

	if (has_cur_bus_speed_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);

	if (has_test_file(slot) == 0)
		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
}

static struct hotplug_slot *get_slot_from_name (const char *name)
{
	struct hotplug_slot *slot;
	struct list_head *tmp;

	list_for_each (tmp, &pci_hotplug_slot_list) {
		slot = list_entry (tmp, struct hotplug_slot, slot_list);
		if (strcmp(slot->name, name) == 0)
			return slot;
	}
	return NULL;
}

/**
 * pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
 * @slot: pointer to the &struct hotplug_slot to register
 *
 * Registers a hotplug slot with the pci hotplug subsystem, which will allow
 * userspace interaction to the slot.
 *
 * Returns 0 if successful, anything else for an error.
 */
int pci_hp_register (struct hotplug_slot *slot)
{
	int result;

	if (slot == NULL)
		return -ENODEV;
	if ((slot->info == NULL) || (slot->ops == NULL))
		return -EINVAL;

	kobject_set_name(&slot->kobj, "%s", slot->name);
	kobj_set_kset_s(slot, pci_hotplug_slots_subsys);

	/* this can fail if we have already registered a slot with the same name */
	if (kobject_register(&slot->kobj)) {
		err("Unable to register kobject");
		return -EINVAL;
	}
		
	list_add (&slot->slot_list, &pci_hotplug_slot_list);

	result = fs_add_slot (slot);
	dbg ("Added slot %s to the list\n", slot->name);
	return result;
}

/**
 * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
 * @slot: pointer to the &struct hotplug_slot to deregister
 *
 * The @slot must have been registered with the pci hotplug subsystem
 * previously with a call to pci_hp_register().
 *
 * Returns 0 if successful, anything else for an error.
 */
int pci_hp_deregister (struct hotplug_slot *slot)
{
	struct hotplug_slot *temp;

	if (slot == NULL)
		return -ENODEV;

	temp = get_slot_from_name (slot->name);
	if (temp != slot) {
		return -ENODEV;
	}
	list_del (&slot->slot_list);

	fs_remove_slot (slot);
	dbg ("Removed slot %s from the list\n", slot->name);
	kobject_unregister(&slot->kobj);
	return 0;
}

/**
 * pci_hp_change_slot_info - changes the slot's information structure in the core
 * @slot: pointer to the slot whose info has changed
 * @info: pointer to the info copy into the slot's info structure
 *
 * @slot must have been registered with the pci 
 * hotplug subsystem previously with a call to pci_hp_register().
 *
 * Returns 0 if successful, anything else for an error.
 */
int pci_hp_change_slot_info (struct hotplug_slot *slot, struct hotplug_slot_info *info)
{
	if ((slot == NULL) || (info == NULL))
		return -ENODEV;

	/*
	* check all fields in the info structure, and update timestamps
	* for the files referring to the fields that have now changed.
	*/
	if ((has_power_file(slot) == 0) &&
	    (slot->info->power_status != info->power_status))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_power.attr);

	if ((has_attention_file(slot) == 0) &&
	    (slot->info->attention_status != info->attention_status))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_attention.attr);

	if ((has_latch_file(slot) == 0) &&
	    (slot->info->latch_status != info->latch_status))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_latch.attr);

	if ((has_adapter_file(slot) == 0) &&
	    (slot->info->adapter_status != info->adapter_status))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_presence.attr);

	if ((has_address_file(slot) == 0) &&
	    (slot->info->address != info->address))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_address.attr);

	if ((has_max_bus_speed_file(slot) == 0) &&
	    (slot->info->max_bus_speed != info->max_bus_speed))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);

	if ((has_cur_bus_speed_file(slot) == 0) &&
	    (slot->info->cur_bus_speed != info->cur_bus_speed))
		sysfs_update_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);

	memcpy (slot->info, info, sizeof (struct hotplug_slot_info));

	return 0;
}

static int __init pci_hotplug_init (void)
{
	int result;

	kset_set_kset_s(&pci_hotplug_slots_subsys, pci_bus_type.subsys);
	result = subsystem_register(&pci_hotplug_slots_subsys);
	if (result) {
		err("Register subsys with error %d\n", result);
		goto exit;
	}
	result = cpci_hotplug_init(debug);
	if (result) {
		err ("cpci_hotplug_init with error %d\n", result);
		goto err_subsys;
	}

	info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
	goto exit;
	
err_subsys:
	subsystem_unregister(&pci_hotplug_slots_subsys);
exit:
	return result;
}

static void __exit pci_hotplug_exit (void)
{
	cpci_hotplug_exit();
	subsystem_unregister(&pci_hotplug_slots_subsys);
}

module_init(pci_hotplug_init);
module_exit(pci_hotplug_exit);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");

EXPORT_SYMBOL_GPL(pci_hotplug_slots_subsys);
EXPORT_SYMBOL_GPL(pci_hp_register);
EXPORT_SYMBOL_GPL(pci_hp_deregister);
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);