474 lines
11 KiB
C
474 lines
11 KiB
C
/*
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* Ultra Wide Band
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* Life cycle of radio controllers
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*
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* Copyright (C) 2005-2006 Intel Corporation
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* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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*
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* FIXME: docs
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*
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* A UWB radio controller is also a UWB device, so it embeds one...
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*
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* List of RCs comes from the 'struct class uwb_rc_class'.
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/random.h>
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#include <linux/kdev_t.h>
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#include <linux/etherdevice.h>
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#include <linux/usb.h>
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#include "uwb-internal.h"
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static int uwb_rc_index_match(struct device *dev, void *data)
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{
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int *index = data;
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struct uwb_rc *rc = dev_get_drvdata(dev);
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if (rc->index == *index)
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return 1;
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return 0;
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}
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static struct uwb_rc *uwb_rc_find_by_index(int index)
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{
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struct device *dev;
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struct uwb_rc *rc = NULL;
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dev = class_find_device(&uwb_rc_class, NULL, &index, uwb_rc_index_match);
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if (dev)
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rc = dev_get_drvdata(dev);
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return rc;
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}
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static int uwb_rc_new_index(void)
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{
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int index = 0;
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for (;;) {
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if (!uwb_rc_find_by_index(index))
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return index;
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if (++index < 0)
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index = 0;
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}
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}
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/**
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* Release the backing device of a uwb_rc that has been dynamically allocated.
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*/
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static void uwb_rc_sys_release(struct device *dev)
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{
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struct uwb_dev *uwb_dev = container_of(dev, struct uwb_dev, dev);
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struct uwb_rc *rc = container_of(uwb_dev, struct uwb_rc, uwb_dev);
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uwb_rc_ie_release(rc);
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kfree(rc);
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}
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void uwb_rc_init(struct uwb_rc *rc)
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{
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struct uwb_dev *uwb_dev = &rc->uwb_dev;
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uwb_dev_init(uwb_dev);
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rc->uwb_dev.dev.class = &uwb_rc_class;
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rc->uwb_dev.dev.release = uwb_rc_sys_release;
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uwb_rc_neh_create(rc);
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rc->beaconing = -1;
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rc->scan_type = UWB_SCAN_DISABLED;
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INIT_LIST_HEAD(&rc->notifs_chain.list);
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mutex_init(&rc->notifs_chain.mutex);
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INIT_LIST_HEAD(&rc->uwb_beca.list);
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mutex_init(&rc->uwb_beca.mutex);
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uwb_drp_avail_init(rc);
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uwb_rc_ie_init(rc);
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uwb_rsv_init(rc);
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uwb_rc_pal_init(rc);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_init);
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struct uwb_rc *uwb_rc_alloc(void)
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{
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struct uwb_rc *rc;
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rc = kzalloc(sizeof(*rc), GFP_KERNEL);
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if (rc == NULL)
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return NULL;
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uwb_rc_init(rc);
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return rc;
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}
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EXPORT_SYMBOL_GPL(uwb_rc_alloc);
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static struct attribute *rc_attrs[] = {
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&dev_attr_mac_address.attr,
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&dev_attr_scan.attr,
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&dev_attr_beacon.attr,
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NULL,
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};
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static struct attribute_group rc_attr_group = {
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.attrs = rc_attrs,
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};
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/*
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* Registration of sysfs specific stuff
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*/
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static int uwb_rc_sys_add(struct uwb_rc *rc)
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{
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return sysfs_create_group(&rc->uwb_dev.dev.kobj, &rc_attr_group);
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}
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static void __uwb_rc_sys_rm(struct uwb_rc *rc)
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{
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sysfs_remove_group(&rc->uwb_dev.dev.kobj, &rc_attr_group);
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}
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/**
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* uwb_rc_mac_addr_setup - get an RC's EUI-48 address or set it
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* @rc: the radio controller.
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*
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* If the EUI-48 address is 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF
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* then a random locally administered EUI-48 is generated and set on
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* the device. The probability of address collisions is sufficiently
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* unlikely (1/2^40 = 9.1e-13) that they're not checked for.
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*/
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static
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int uwb_rc_mac_addr_setup(struct uwb_rc *rc)
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{
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int result;
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struct device *dev = &rc->uwb_dev.dev;
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struct uwb_dev *uwb_dev = &rc->uwb_dev;
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char devname[UWB_ADDR_STRSIZE];
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struct uwb_mac_addr addr;
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result = uwb_rc_mac_addr_get(rc, &addr);
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if (result < 0) {
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dev_err(dev, "cannot retrieve UWB EUI-48 address: %d\n", result);
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return result;
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}
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if (uwb_mac_addr_unset(&addr) || uwb_mac_addr_bcast(&addr)) {
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addr.data[0] = 0x02; /* locally adminstered and unicast */
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get_random_bytes(&addr.data[1], sizeof(addr.data)-1);
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result = uwb_rc_mac_addr_set(rc, &addr);
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if (result < 0) {
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uwb_mac_addr_print(devname, sizeof(devname), &addr);
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dev_err(dev, "cannot set EUI-48 address %s: %d\n",
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devname, result);
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return result;
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}
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}
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uwb_dev->mac_addr = addr;
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return 0;
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}
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static int uwb_rc_setup(struct uwb_rc *rc)
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{
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int result;
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struct device *dev = &rc->uwb_dev.dev;
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result = uwb_radio_setup(rc);
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if (result < 0) {
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dev_err(dev, "cannot setup UWB radio: %d\n", result);
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goto error;
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}
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result = uwb_rc_mac_addr_setup(rc);
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if (result < 0) {
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dev_err(dev, "cannot setup UWB MAC address: %d\n", result);
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goto error;
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}
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result = uwb_rc_dev_addr_assign(rc);
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if (result < 0) {
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dev_err(dev, "cannot assign UWB DevAddr: %d\n", result);
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goto error;
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}
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result = uwb_rc_ie_setup(rc);
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if (result < 0) {
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dev_err(dev, "cannot setup IE subsystem: %d\n", result);
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goto error_ie_setup;
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}
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result = uwb_rsv_setup(rc);
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if (result < 0) {
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dev_err(dev, "cannot setup reservation subsystem: %d\n", result);
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goto error_rsv_setup;
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}
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uwb_dbg_add_rc(rc);
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return 0;
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error_rsv_setup:
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uwb_rc_ie_release(rc);
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error_ie_setup:
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error:
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return result;
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}
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/**
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* Register a new UWB radio controller
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*
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* Did you call uwb_rc_init() on your rc?
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*
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* We assume that this is being called with a > 0 refcount on
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* it [through ops->{get|put}_device(). We'll take our own, though.
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*
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* @parent_dev is our real device, the one that provides the actual UWB device
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*/
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int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv)
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{
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int result;
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struct device *dev;
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char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
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rc->index = uwb_rc_new_index();
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dev = &rc->uwb_dev.dev;
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dev_set_name(dev, "uwb%d", rc->index);
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rc->priv = priv;
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init_waitqueue_head(&rc->uwbd.wq);
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INIT_LIST_HEAD(&rc->uwbd.event_list);
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spin_lock_init(&rc->uwbd.event_list_lock);
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uwbd_start(rc);
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result = rc->start(rc);
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if (result < 0)
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goto error_rc_start;
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result = uwb_rc_setup(rc);
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if (result < 0) {
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dev_err(dev, "cannot setup UWB radio controller: %d\n", result);
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goto error_rc_setup;
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}
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result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc);
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if (result < 0 && result != -EADDRNOTAVAIL)
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goto error_dev_add;
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result = uwb_rc_sys_add(rc);
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if (result < 0) {
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dev_err(parent_dev, "cannot register UWB radio controller "
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"dev attributes: %d\n", result);
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goto error_sys_add;
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}
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uwb_mac_addr_print(macbuf, sizeof(macbuf), &rc->uwb_dev.mac_addr);
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uwb_dev_addr_print(devbuf, sizeof(devbuf), &rc->uwb_dev.dev_addr);
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dev_info(dev,
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"new uwb radio controller (mac %s dev %s) on %s %s\n",
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macbuf, devbuf, parent_dev->bus->name, dev_name(parent_dev));
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rc->ready = 1;
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return 0;
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error_sys_add:
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uwb_dev_rm(&rc->uwb_dev);
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error_dev_add:
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error_rc_setup:
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rc->stop(rc);
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error_rc_start:
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uwbd_stop(rc);
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return result;
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}
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EXPORT_SYMBOL_GPL(uwb_rc_add);
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static int uwb_dev_offair_helper(struct device *dev, void *priv)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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return __uwb_dev_offair(uwb_dev, uwb_dev->rc);
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}
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/*
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* Remove a Radio Controller; stop beaconing/scanning, disconnect all children
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*/
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void uwb_rc_rm(struct uwb_rc *rc)
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{
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rc->ready = 0;
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uwb_dbg_del_rc(rc);
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uwb_rsv_remove_all(rc);
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uwb_radio_shutdown(rc);
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rc->stop(rc);
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uwbd_stop(rc);
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uwb_rc_neh_destroy(rc);
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uwb_dev_lock(&rc->uwb_dev);
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rc->priv = NULL;
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rc->cmd = NULL;
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uwb_dev_unlock(&rc->uwb_dev);
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mutex_lock(&rc->uwb_beca.mutex);
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uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL);
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__uwb_rc_sys_rm(rc);
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mutex_unlock(&rc->uwb_beca.mutex);
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uwb_rsv_cleanup(rc);
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uwb_beca_release(rc);
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uwb_dev_rm(&rc->uwb_dev);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_rm);
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static int find_rc_try_get(struct device *dev, void *data)
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{
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struct uwb_rc *target_rc = data;
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struct uwb_rc *rc = dev_get_drvdata(dev);
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if (rc == NULL) {
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WARN_ON(1);
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return 0;
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}
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if (rc == target_rc) {
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if (rc->ready == 0)
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return 0;
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else
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return 1;
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}
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return 0;
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}
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/**
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* Given a radio controller descriptor, validate and refcount it
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*
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* @returns NULL if the rc does not exist or is quiescing; the ptr to
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* it otherwise.
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*/
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struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *target_rc)
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{
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struct device *dev;
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struct uwb_rc *rc = NULL;
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dev = class_find_device(&uwb_rc_class, NULL, target_rc,
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find_rc_try_get);
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if (dev) {
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rc = dev_get_drvdata(dev);
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__uwb_rc_get(rc);
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}
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return rc;
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}
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EXPORT_SYMBOL_GPL(__uwb_rc_try_get);
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/*
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* RC get for external refcount acquirers...
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*
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* Increments the refcount of the device and it's backend modules
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*/
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static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc)
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{
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if (rc->ready == 0)
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return NULL;
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uwb_dev_get(&rc->uwb_dev);
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return rc;
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}
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static int find_rc_grandpa(struct device *dev, void *data)
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{
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struct device *grandpa_dev = data;
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struct uwb_rc *rc = dev_get_drvdata(dev);
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if (rc->uwb_dev.dev.parent->parent == grandpa_dev) {
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rc = uwb_rc_get(rc);
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return 1;
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}
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return 0;
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}
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/**
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* Locate and refcount a radio controller given a common grand-parent
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*
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* @grandpa_dev Pointer to the 'grandparent' device structure.
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* @returns NULL If the rc does not exist or is quiescing; the ptr to
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* it otherwise, properly referenced.
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*
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* The Radio Control interface (or the UWB Radio Controller) is always
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* an interface of a device. The parent is the interface, the
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* grandparent is the device that encapsulates the interface.
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*
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* There is no need to lock around as the "grandpa" would be
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* refcounted by the target, and to remove the referemes, the
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* uwb_rc_class->sem would have to be taken--we hold it, ergo we
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* should be safe.
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*/
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struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev)
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{
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struct device *dev;
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struct uwb_rc *rc = NULL;
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dev = class_find_device(&uwb_rc_class, NULL, (void *)grandpa_dev,
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find_rc_grandpa);
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if (dev)
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rc = dev_get_drvdata(dev);
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return rc;
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}
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EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa);
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/**
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* Find a radio controller by device address
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*
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* @returns the pointer to the radio controller, properly referenced
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*/
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static int find_rc_dev(struct device *dev, void *data)
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{
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struct uwb_dev_addr *addr = data;
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struct uwb_rc *rc = dev_get_drvdata(dev);
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if (rc == NULL) {
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WARN_ON(1);
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return 0;
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}
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if (!uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, addr)) {
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rc = uwb_rc_get(rc);
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return 1;
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}
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return 0;
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}
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struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr)
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{
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struct device *dev;
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struct uwb_rc *rc = NULL;
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dev = class_find_device(&uwb_rc_class, NULL, (void *)addr,
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find_rc_dev);
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if (dev)
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rc = dev_get_drvdata(dev);
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return rc;
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}
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EXPORT_SYMBOL_GPL(uwb_rc_get_by_dev);
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/**
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* Drop a reference on a radio controller
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*
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* This is the version that should be done by entities external to the
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* UWB Radio Control stack (ie: clients of the API).
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*/
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void uwb_rc_put(struct uwb_rc *rc)
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{
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__uwb_rc_put(rc);
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}
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EXPORT_SYMBOL_GPL(uwb_rc_put);
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