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/*
* Ultra Wide Band
* Life cycle of devices
*
* 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
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/kdev_t.h>
#include <linux/random.h>
#include "uwb-internal.h"
/* We initialize addresses to 0xff (invalid, as it is bcast) */
static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr)
{
memset(&addr->data, 0xff, sizeof(addr->data));
}
static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr)
{
memset(&addr->data, 0xff, sizeof(addr->data));
}
/* @returns !0 if a device @addr is a broadcast address */
static inline int uwb_dev_addr_bcast(const struct uwb_dev_addr *addr)
{
static const struct uwb_dev_addr bcast = { .data = { 0xff, 0xff } };
return !uwb_dev_addr_cmp(addr, &bcast);
}
/*
* Add callback @new to be called when an event occurs in @rc.
*/
int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new)
{
if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
return -ERESTARTSYS;
list_add(&new->list_node, &rc->notifs_chain.list);
mutex_unlock(&rc->notifs_chain.mutex);
return 0;
}
EXPORT_SYMBOL_GPL(uwb_notifs_register);
/*
* Remove event handler (callback)
*/
int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry)
{
if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
return -ERESTARTSYS;
list_del(&entry->list_node);
mutex_unlock(&rc->notifs_chain.mutex);
return 0;
}
EXPORT_SYMBOL_GPL(uwb_notifs_deregister);
/*
* Notify all event handlers of a given event on @rc
*
* We are called with a valid reference to the device, or NULL if the
* event is not for a particular event (e.g., a BG join event).
*/
void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event)
{
struct uwb_notifs_handler *handler;
if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
return;
if (!list_empty(&rc->notifs_chain.list)) {
list_for_each_entry(handler, &rc->notifs_chain.list, list_node) {
handler->cb(handler->data, uwb_dev, event);
}
}
mutex_unlock(&rc->notifs_chain.mutex);
}
/*
* Release the backing device of a uwb_dev that has been dynamically allocated.
*/
static void uwb_dev_sys_release(struct device *dev)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
uwb_bce_put(uwb_dev->bce);
memset(uwb_dev, 0x69, sizeof(*uwb_dev));
kfree(uwb_dev);
}
/*
* Initialize a UWB device instance
*
* Alloc, zero and call this function.
*/
void uwb_dev_init(struct uwb_dev *uwb_dev)
{
mutex_init(&uwb_dev->mutex);
device_initialize(&uwb_dev->dev);
uwb_dev->dev.release = uwb_dev_sys_release;
uwb_dev_addr_init(&uwb_dev->dev_addr);
uwb_mac_addr_init(&uwb_dev->mac_addr);
bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS);
}
static ssize_t uwb_dev_EUI_48_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
char addr[UWB_ADDR_STRSIZE];
uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr);
return sprintf(buf, "%s\n", addr);
}
static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL);
static ssize_t uwb_dev_DevAddr_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
char addr[UWB_ADDR_STRSIZE];
uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr);
return sprintf(buf, "%s\n", addr);
}
static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL);
/*
* Show the BPST of this device.
*
* Calculated from the receive time of the device's beacon and it's
* slot number.
*/
static ssize_t uwb_dev_BPST_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_beca_e *bce;
struct uwb_beacon_frame *bf;
u16 bpst;
bce = uwb_dev->bce;
mutex_lock(&bce->mutex);
bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
bpst = bce->be->wBPSTOffset
- (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US);
mutex_unlock(&bce->mutex);
return sprintf(buf, "%d\n", bpst);
}
static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL);
/*
* Show the IEs a device is beaconing
*
* We need to access the beacon cache, so we just lock it really
* quick, print the IEs and unlock.
*
* We have a reference on the cache entry, so that should be
* quite safe.
*/
static ssize_t uwb_dev_IEs_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE);
}
static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL);
static ssize_t uwb_dev_LQE_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_beca_e *bce = uwb_dev->bce;
size_t result;
mutex_lock(&bce->mutex);
result = stats_show(&uwb_dev->bce->lqe_stats, buf);
mutex_unlock(&bce->mutex);
return result;
}
static ssize_t uwb_dev_LQE_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_beca_e *bce = uwb_dev->bce;
ssize_t result;
mutex_lock(&bce->mutex);
result = stats_store(&uwb_dev->bce->lqe_stats, buf, size);
mutex_unlock(&bce->mutex);
return result;
}
static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store);
static ssize_t uwb_dev_RSSI_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_beca_e *bce = uwb_dev->bce;
size_t result;
mutex_lock(&bce->mutex);
result = stats_show(&uwb_dev->bce->rssi_stats, buf);
mutex_unlock(&bce->mutex);
return result;
}
static ssize_t uwb_dev_RSSI_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct uwb_dev *uwb_dev = to_uwb_dev(dev);
struct uwb_beca_e *bce = uwb_dev->bce;
ssize_t result;
mutex_lock(&bce->mutex);
result = stats_store(&uwb_dev->bce->rssi_stats, buf, size);
mutex_unlock(&bce->mutex);
return result;
}
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