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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
The ATTRIBUTE_GROUPS() macro can be used in the uwb code to reduce the number of lines of code. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
470 lines
13 KiB
C
470 lines
13 KiB
C
/*
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* Ultra Wide Band
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* Life cycle of devices
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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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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/kdev_t.h>
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#include <linux/random.h>
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#include <linux/stat.h>
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#include "uwb-internal.h"
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/* We initialize addresses to 0xff (invalid, as it is bcast) */
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static inline void uwb_dev_addr_init(struct uwb_dev_addr *addr)
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{
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memset(&addr->data, 0xff, sizeof(addr->data));
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}
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static inline void uwb_mac_addr_init(struct uwb_mac_addr *addr)
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{
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memset(&addr->data, 0xff, sizeof(addr->data));
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}
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/* @returns !0 if a device @addr is a broadcast address */
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static inline int uwb_dev_addr_bcast(const struct uwb_dev_addr *addr)
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{
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static const struct uwb_dev_addr bcast = { .data = { 0xff, 0xff } };
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return !uwb_dev_addr_cmp(addr, &bcast);
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}
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/*
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* Add callback @new to be called when an event occurs in @rc.
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*/
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int uwb_notifs_register(struct uwb_rc *rc, struct uwb_notifs_handler *new)
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{
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if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
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return -ERESTARTSYS;
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list_add(&new->list_node, &rc->notifs_chain.list);
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mutex_unlock(&rc->notifs_chain.mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(uwb_notifs_register);
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/*
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* Remove event handler (callback)
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*/
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int uwb_notifs_deregister(struct uwb_rc *rc, struct uwb_notifs_handler *entry)
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{
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if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
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return -ERESTARTSYS;
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list_del(&entry->list_node);
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mutex_unlock(&rc->notifs_chain.mutex);
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return 0;
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}
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EXPORT_SYMBOL_GPL(uwb_notifs_deregister);
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/*
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* Notify all event handlers of a given event on @rc
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*
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* We are called with a valid reference to the device, or NULL if the
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* event is not for a particular event (e.g., a BG join event).
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*/
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void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event)
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{
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struct uwb_notifs_handler *handler;
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if (mutex_lock_interruptible(&rc->notifs_chain.mutex))
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return;
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if (!list_empty(&rc->notifs_chain.list)) {
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list_for_each_entry(handler, &rc->notifs_chain.list, list_node) {
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handler->cb(handler->data, uwb_dev, event);
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}
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}
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mutex_unlock(&rc->notifs_chain.mutex);
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}
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/*
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* Release the backing device of a uwb_dev that has been dynamically allocated.
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*/
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static void uwb_dev_sys_release(struct device *dev)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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uwb_bce_put(uwb_dev->bce);
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memset(uwb_dev, 0x69, sizeof(*uwb_dev));
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kfree(uwb_dev);
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}
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/*
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* Initialize a UWB device instance
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*
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* Alloc, zero and call this function.
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*/
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void uwb_dev_init(struct uwb_dev *uwb_dev)
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{
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mutex_init(&uwb_dev->mutex);
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device_initialize(&uwb_dev->dev);
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uwb_dev->dev.release = uwb_dev_sys_release;
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uwb_dev_addr_init(&uwb_dev->dev_addr);
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uwb_mac_addr_init(&uwb_dev->mac_addr);
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bitmap_fill(uwb_dev->streams, UWB_NUM_GLOBAL_STREAMS);
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}
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static ssize_t uwb_dev_EUI_48_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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char addr[UWB_ADDR_STRSIZE];
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uwb_mac_addr_print(addr, sizeof(addr), &uwb_dev->mac_addr);
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return sprintf(buf, "%s\n", addr);
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}
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static DEVICE_ATTR(EUI_48, S_IRUGO, uwb_dev_EUI_48_show, NULL);
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static ssize_t uwb_dev_DevAddr_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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char addr[UWB_ADDR_STRSIZE];
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uwb_dev_addr_print(addr, sizeof(addr), &uwb_dev->dev_addr);
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return sprintf(buf, "%s\n", addr);
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}
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static DEVICE_ATTR(DevAddr, S_IRUGO, uwb_dev_DevAddr_show, NULL);
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/*
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* Show the BPST of this device.
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*
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* Calculated from the receive time of the device's beacon and it's
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* slot number.
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*/
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static ssize_t uwb_dev_BPST_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_beca_e *bce;
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struct uwb_beacon_frame *bf;
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u16 bpst;
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bce = uwb_dev->bce;
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mutex_lock(&bce->mutex);
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bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo;
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bpst = bce->be->wBPSTOffset
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- (u16)(bf->Beacon_Slot_Number * UWB_BEACON_SLOT_LENGTH_US);
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mutex_unlock(&bce->mutex);
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return sprintf(buf, "%d\n", bpst);
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}
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static DEVICE_ATTR(BPST, S_IRUGO, uwb_dev_BPST_show, NULL);
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/*
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* Show the IEs a device is beaconing
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*
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* We need to access the beacon cache, so we just lock it really
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* quick, print the IEs and unlock.
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*
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* We have a reference on the cache entry, so that should be
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* quite safe.
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*/
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static ssize_t uwb_dev_IEs_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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return uwb_bce_print_IEs(uwb_dev, uwb_dev->bce, buf, PAGE_SIZE);
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}
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static DEVICE_ATTR(IEs, S_IRUGO | S_IWUSR, uwb_dev_IEs_show, NULL);
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static ssize_t uwb_dev_LQE_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_beca_e *bce = uwb_dev->bce;
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size_t result;
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mutex_lock(&bce->mutex);
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result = stats_show(&uwb_dev->bce->lqe_stats, buf);
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mutex_unlock(&bce->mutex);
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return result;
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}
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static ssize_t uwb_dev_LQE_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_beca_e *bce = uwb_dev->bce;
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ssize_t result;
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mutex_lock(&bce->mutex);
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result = stats_store(&uwb_dev->bce->lqe_stats, buf, size);
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mutex_unlock(&bce->mutex);
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return result;
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}
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static DEVICE_ATTR(LQE, S_IRUGO | S_IWUSR, uwb_dev_LQE_show, uwb_dev_LQE_store);
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static ssize_t uwb_dev_RSSI_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_beca_e *bce = uwb_dev->bce;
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size_t result;
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mutex_lock(&bce->mutex);
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result = stats_show(&uwb_dev->bce->rssi_stats, buf);
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mutex_unlock(&bce->mutex);
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return result;
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}
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static ssize_t uwb_dev_RSSI_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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struct uwb_beca_e *bce = uwb_dev->bce;
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ssize_t result;
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mutex_lock(&bce->mutex);
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result = stats_store(&uwb_dev->bce->rssi_stats, buf, size);
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mutex_unlock(&bce->mutex);
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return result;
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}
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static DEVICE_ATTR(RSSI, S_IRUGO | S_IWUSR, uwb_dev_RSSI_show, uwb_dev_RSSI_store);
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static struct attribute *uwb_dev_attrs[] = {
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&dev_attr_EUI_48.attr,
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&dev_attr_DevAddr.attr,
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&dev_attr_BPST.attr,
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&dev_attr_IEs.attr,
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&dev_attr_LQE.attr,
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&dev_attr_RSSI.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(uwb_dev);
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/**
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* Device SYSFS registration
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*/
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static int __uwb_dev_sys_add(struct uwb_dev *uwb_dev, struct device *parent_dev)
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{
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struct device *dev;
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dev = &uwb_dev->dev;
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/* Device sysfs files are only useful for neighbor devices not
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local radio controllers. */
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if (&uwb_dev->rc->uwb_dev != uwb_dev)
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dev->groups = uwb_dev_groups;
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dev->parent = parent_dev;
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dev_set_drvdata(dev, uwb_dev);
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return device_add(dev);
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}
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static void __uwb_dev_sys_rm(struct uwb_dev *uwb_dev)
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{
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dev_set_drvdata(&uwb_dev->dev, NULL);
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device_del(&uwb_dev->dev);
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}
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/**
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* Register and initialize a new UWB device
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*
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* Did you call uwb_dev_init() on it?
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*
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* @parent_rc: is the parent radio controller who has the link to the
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* device. When registering the UWB device that is a UWB
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* Radio Controller, we point back to it.
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*
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* If registering the device that is part of a radio, caller has set
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* rc->uwb_dev->dev. Otherwise it is to be left NULL--a new one will
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* be allocated.
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*/
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int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
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struct uwb_rc *parent_rc)
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{
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int result;
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struct device *dev;
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BUG_ON(uwb_dev == NULL);
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BUG_ON(parent_dev == NULL);
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BUG_ON(parent_rc == NULL);
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mutex_lock(&uwb_dev->mutex);
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dev = &uwb_dev->dev;
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uwb_dev->rc = parent_rc;
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result = __uwb_dev_sys_add(uwb_dev, parent_dev);
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if (result < 0)
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printk(KERN_ERR "UWB: unable to register dev %s with sysfs: %d\n",
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dev_name(dev), result);
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mutex_unlock(&uwb_dev->mutex);
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return result;
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}
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void uwb_dev_rm(struct uwb_dev *uwb_dev)
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{
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mutex_lock(&uwb_dev->mutex);
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__uwb_dev_sys_rm(uwb_dev);
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mutex_unlock(&uwb_dev->mutex);
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}
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static
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int __uwb_dev_try_get(struct device *dev, void *__target_uwb_dev)
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{
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struct uwb_dev *target_uwb_dev = __target_uwb_dev;
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struct uwb_dev *uwb_dev = to_uwb_dev(dev);
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if (uwb_dev == target_uwb_dev) {
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uwb_dev_get(uwb_dev);
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return 1;
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} else
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return 0;
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}
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/**
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* Given a UWB device descriptor, validate and refcount it
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*
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* @returns NULL if the device 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_dev *uwb_dev_try_get(struct uwb_rc *rc, struct uwb_dev *uwb_dev)
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{
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if (uwb_dev_for_each(rc, __uwb_dev_try_get, uwb_dev))
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return uwb_dev;
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else
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return NULL;
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}
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EXPORT_SYMBOL_GPL(uwb_dev_try_get);
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/**
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* Remove a device from the system [grunt for other functions]
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*/
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int __uwb_dev_offair(struct uwb_dev *uwb_dev, struct uwb_rc *rc)
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{
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struct device *dev = &uwb_dev->dev;
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char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
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uwb_mac_addr_print(macbuf, sizeof(macbuf), &uwb_dev->mac_addr);
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uwb_dev_addr_print(devbuf, sizeof(devbuf), &uwb_dev->dev_addr);
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dev_info(dev, "uwb device (mac %s dev %s) disconnected from %s %s\n",
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macbuf, devbuf,
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rc ? rc->uwb_dev.dev.parent->bus->name : "n/a",
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rc ? dev_name(rc->uwb_dev.dev.parent) : "");
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uwb_dev_rm(uwb_dev);
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list_del(&uwb_dev->bce->node);
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uwb_bce_put(uwb_dev->bce);
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uwb_dev_put(uwb_dev); /* for the creation in _onair() */
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return 0;
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}
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/**
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* A device went off the air, clean up after it!
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*
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* This is called by the UWB Daemon (through the beacon purge function
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* uwb_bcn_cache_purge) when it is detected that a device has been in
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* radio silence for a while.
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*
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* If this device is actually a local radio controller we don't need
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* to go through the offair process, as it is not registered as that.
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*
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* NOTE: uwb_bcn_cache.mutex is held!
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*/
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void uwbd_dev_offair(struct uwb_beca_e *bce)
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{
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struct uwb_dev *uwb_dev;
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uwb_dev = bce->uwb_dev;
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if (uwb_dev) {
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uwb_notify(uwb_dev->rc, uwb_dev, UWB_NOTIF_OFFAIR);
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__uwb_dev_offair(uwb_dev, uwb_dev->rc);
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}
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}
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/**
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* A device went on the air, start it up!
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*
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* This is called by the UWB Daemon when it is detected that a device
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* has popped up in the radio range of the radio controller.
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*
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* It will just create the freaking device, register the beacon and
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* stuff and yatla, done.
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*
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*
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* NOTE: uwb_beca.mutex is held, bce->mutex is held
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*/
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void uwbd_dev_onair(struct uwb_rc *rc, struct uwb_beca_e *bce)
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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;
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char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE];
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uwb_mac_addr_print(macbuf, sizeof(macbuf), bce->mac_addr);
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uwb_dev_addr_print(devbuf, sizeof(devbuf), &bce->dev_addr);
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uwb_dev = kzalloc(sizeof(struct uwb_dev), GFP_KERNEL);
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if (uwb_dev == NULL) {
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dev_err(dev, "new device %s: Cannot allocate memory\n",
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macbuf);
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return;
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}
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uwb_dev_init(uwb_dev); /* This sets refcnt to one, we own it */
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uwb_dev->mac_addr = *bce->mac_addr;
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uwb_dev->dev_addr = bce->dev_addr;
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dev_set_name(&uwb_dev->dev, "%s", macbuf);
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result = uwb_dev_add(uwb_dev, &rc->uwb_dev.dev, rc);
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if (result < 0) {
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dev_err(dev, "new device %s: cannot instantiate device\n",
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macbuf);
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goto error_dev_add;
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}
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/* plug the beacon cache */
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bce->uwb_dev = uwb_dev;
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uwb_dev->bce = bce;
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uwb_bce_get(bce); /* released in uwb_dev_sys_release() */
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dev_info(dev, "uwb device (mac %s dev %s) connected to %s %s\n",
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macbuf, devbuf, rc->uwb_dev.dev.parent->bus->name,
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dev_name(rc->uwb_dev.dev.parent));
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uwb_notify(rc, uwb_dev, UWB_NOTIF_ONAIR);
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return;
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error_dev_add:
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kfree(uwb_dev);
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return;
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}
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/**
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* Iterate over the list of UWB devices, calling a @function on each
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*
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* See docs for bus_for_each()....
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*
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* @rc: radio controller for the devices.
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* @function: function to call.
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* @priv: data to pass to @function.
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* @returns: 0 if no invocation of function() returned a value
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* different to zero. That value otherwise.
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*/
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int uwb_dev_for_each(struct uwb_rc *rc, uwb_dev_for_each_f function, void *priv)
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{
|
|
return device_for_each_child(&rc->uwb_dev.dev, priv, function);
|
|
}
|
|
EXPORT_SYMBOL_GPL(uwb_dev_for_each);
|