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|
/*
* Ultra Wide Band
* Life cycle of radio controllers
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*
* A UWB radio controller is also a UWB device, so it embeds one...
*
* List of RCs comes from the 'struct class uwb_rc_class'.
*/
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/kdev_t.h>
#include <linux/etherdevice.h>
#include <linux/usb.h>
#include "uwb-internal.h"
static int uwb_rc_index_match(struct device *dev, void *data)
{
int *index = data;
struct uwb_rc *rc = dev_get_drvdata(dev);
if (rc->index == *index)
return 1;
return 0;
}
static struct uwb_rc *uwb_rc_find_by_index(int index)
{
struct device *dev;
struct uwb_rc *rc = NULL;
dev = class_find_device(&uwb_rc_class, NULL, &index, uwb_rc_index_match);
if (dev)
rc = dev_get_drvdata(dev);
return rc;
}
static int uwb_rc_new_index(void)
{
int index = 0;
for (;;) {
if (!uwb_rc_find_by_index(index))
return index;
if (++index < 0)
index = 0;
}
}
/**
* Release the backing device of a uwb_rc that has been dynamically allocated.
*/
static void uwb_rc_sys_release(struct device *dev)
{
struct uwb_dev *uwb_dev = container_of(dev, struct uwb_dev, dev);
struct uwb_rc *rc = container_of(uwb_dev, struct uwb_rc, uwb_dev);
uwb_rc_ie_release(rc);
kfree(rc);
}
void uwb_rc_init(struct uwb_rc *rc)
{
struct uwb_dev *uwb_dev = &rc->uwb_dev;
uwb_dev_init(uwb_dev);
rc->uwb_dev.dev.class = &uwb_rc_class;
rc->uwb_dev.dev.release = uwb_rc_sys_release;
uwb_rc_neh_create(rc);
rc->beaconing = -1;
rc->scan_type = UWB_SCAN_DISABLED;
INIT_LIST_HEAD(&rc->notifs_chain.list);
mutex_init(&rc->notifs_chain.mutex);
INIT_LIST_HEAD(&rc->uwb_beca.list);
mutex_init(&rc->uwb_beca.mutex);
uwb_drp_avail_init(rc);
uwb_rc_ie_init(rc);
uwb_rsv_init(rc);
uwb_rc_pal_init(rc);
}
EXPORT_SYMBOL_GPL(uwb_rc_init);
struct uwb_rc *uwb_rc_alloc(void)
{
struct uwb_rc *rc;
rc = kzalloc(sizeof(*rc), GFP_KERNEL);
if (rc == NULL)
return NULL;
uwb_rc_init(rc);
return rc;
}
EXPORT_SYMBOL_GPL(uwb_rc_alloc);
static struct attribute *rc_attrs[] = {
&dev_attr_mac_address.attr,
&dev_attr_scan.attr,
&dev_attr_beacon.attr,
NULL,
};
static struct attribute_group rc_attr_group = {
.attrs = rc_attrs,
};
/*
* Registration of sysfs specific stuff
*/
static int uwb_rc_sys_add(struct uwb_rc *rc)
{
return sysfs_create_group(&rc->uwb_dev.dev.kobj, &rc_attr_group);
}
static void __uwb_rc_sys_rm(struct uwb_rc *rc)
{
sysfs_remove_group(&rc->uwb_dev.dev.kobj, &rc_attr_group);
}
/**
* uwb_rc_mac_addr_setup - get an RC's EUI-48 address or set it
* @rc: the radio controller.
*
* If the EUI-48 address is 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF
* then a random locally administered EUI-48 is generated and set on
* the device. The probability of address collisions is sufficiently
* unlikely (1/2^40 = 9.1e-13) that they're not checked for.
*/
static
int uwb_rc_mac_addr_setup(struct uwb_rc *rc)
{
int result;
struct device *dev = &rc->uwb_dev.dev;
struct uwb_dev *uwb_dev = &rc->uwb_dev;
char devname[UWB_ADDR_STRSIZE];
struct uwb_mac_addr addr;
result = uwb_rc_mac_addr_get(rc, &addr);
if (result < 0) {
dev_err(dev, "cannot retrieve UWB EUI-48 address: %d\n", result);
return result;
}
if (uwb_mac_addr_unset(&addr) || uwb_mac_addr_bcast(&addr)) {
addr.data[0] = 0x02; /* locally adminstered and unicast */
get_random_bytes(&addr.data[1], sizeof(addr.data)-1);
result = uwb_rc_mac_addr_set(rc, &addr);
if (result < 0) {
uwb_mac_addr_print(devname, sizeof(devname), &addr);
dev_err(dev, "cannot set EUI-48 address %s: %d\n",
devname, result);
return result;
}
}
uwb_dev->mac_addr = addr;
return 0;
}
static int uwb_rc_setup(struct uwb_rc *rc)
{
int result;
struct device *dev = &rc->uwb_dev.dev;
result = uwb_rc_reset(rc);
if (result < 0) {
dev_err(dev, "cannot reset UWB radio: %d\n", result);
goto error;
}
result = uwb_rc_mac_addr_setup(rc);
if (result < 0) {
dev_err(dev, "cannot setup UWB MAC address: %d\n", result);
goto error;
}
result = uwb_rc_dev_addr_assign(rc);
if (result < 0) {
dev_err(dev, "cannot assign UWB DevAddr: %d\n", result);
goto error;
}
result = uwb_rc_ie_setup(rc);
if (result < 0) {
dev_err(dev, "cannot setup IE subsystem: %d\n", result);
goto error_ie_setup;
}
result = uwb_rsv_setup(rc);
if (result < 0) {
dev_err(dev, "cannot setup reservation subsystem: %d\n", result);
goto error_rsv_setup;
}
uwb_dbg_add_rc(rc);
return 0;
error_rsv_setup:
uwb_rc_ie_release(rc);
error_ie_setup:
error:
return result;
}
/**
* Register a new UWB radio controller
*
* Did you call uwb_rc_init() on your rc?
*
* We assume that this is being called with a > 0 refcount on
* it [through ops->{get|put}_device(). We'll take our own, though.
*
* @parent_dev is our real device, the one that provides the actual UWB device
*/
int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv)
{
int result;
struct device *dev;
char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
rc->index = uwb_rc_new_index();
dev = &rc->uwb_dev.dev;
dev_set_name(dev, "uwb%d", rc->index);
rc->priv = priv;
init_waitqueue_head(&rc->uwbd.wq);
INIT_LIST_HEAD(&rc->uwbd.event_list);
spin_lock_init(&rc->uwbd.event_list_lock);
uwbd_start(rc);
result = rc->start(rc);
if (result < 0)
goto error_rc_start;
result = uwb_rc_setup(rc);
if (result < 0) {
dev_err(dev, "cannot setup UWB radio controller: %d\n", result);
goto error_rc_setup;
}
result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc);
if (result < 0 && result != -EADDRNOTAVAIL)
goto error_dev_add;
result = uwb_rc_sys_add(rc);
if (result < 0) {
dev_err(parent_dev, "cannot register UWB radio controller "
"dev attributes: %d\n", result);
goto
|