306 lines
9 KiB
C
306 lines
9 KiB
C
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/*
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* Ultra Wide Band
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* UWB internal API
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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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* This contains most of the internal API for UWB. This is stuff used
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* across the stack that of course, is of no interest to the rest.
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*
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* Some parts might end up going public (like uwb_rc_*())...
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*/
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#ifndef __UWB_INTERNAL_H__
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#define __UWB_INTERNAL_H__
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/uwb.h>
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#include <linux/mutex.h>
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struct uwb_beca_e;
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/* General device API */
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extern void uwb_dev_init(struct uwb_dev *uwb_dev);
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extern int __uwb_dev_offair(struct uwb_dev *, struct uwb_rc *);
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extern 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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extern void uwb_dev_rm(struct uwb_dev *uwb_dev);
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extern void uwbd_dev_onair(struct uwb_rc *, struct uwb_beca_e *);
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extern void uwbd_dev_offair(struct uwb_beca_e *);
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void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event);
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/* General UWB Radio Controller Internal API */
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extern struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *);
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static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
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{
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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 inline void __uwb_rc_put(struct uwb_rc *rc)
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{
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uwb_dev_put(&rc->uwb_dev);
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}
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extern int uwb_rc_reset(struct uwb_rc *rc);
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extern int uwb_rc_beacon(struct uwb_rc *rc,
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int channel, unsigned bpst_offset);
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extern int uwb_rc_scan(struct uwb_rc *rc,
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unsigned channel, enum uwb_scan_type type,
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unsigned bpst_offset);
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extern int uwb_rc_send_all_drp_ie(struct uwb_rc *rc);
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extern ssize_t uwb_rc_print_IEs(struct uwb_rc *rc, char *, size_t);
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extern void uwb_rc_ie_init(struct uwb_rc *);
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extern void uwb_rc_ie_init(struct uwb_rc *);
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extern ssize_t uwb_rc_ie_setup(struct uwb_rc *);
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extern void uwb_rc_ie_release(struct uwb_rc *);
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extern int uwb_rc_ie_add(struct uwb_rc *,
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const struct uwb_ie_hdr *, size_t);
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extern int uwb_rc_ie_rm(struct uwb_rc *, enum uwb_ie);
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extern const char *uwb_rc_strerror(unsigned code);
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/*
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* Time to wait for a response to an RC command.
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*
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* Some commands can take a long time to response. e.g., START_BEACON
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* may scan for several superframes before joining an existing beacon
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* group and this can take around 600 ms.
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*/
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#define UWB_RC_CMD_TIMEOUT_MS 1000 /* ms */
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/*
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* Notification/Event Handlers
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*/
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struct uwb_rc_neh;
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void uwb_rc_neh_create(struct uwb_rc *rc);
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void uwb_rc_neh_destroy(struct uwb_rc *rc);
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struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
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u8 expected_type, u16 expected_event,
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uwb_rc_cmd_cb_f cb, void *arg);
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void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
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void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
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void uwb_rc_neh_put(struct uwb_rc_neh *neh);
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/* Event size tables */
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extern int uwb_est_create(void);
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extern void uwb_est_destroy(void);
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/*
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* UWB Events & management daemon
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*/
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/**
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* enum uwb_event_type - types of UWB management daemon events
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*
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* The UWB management daemon (uwbd) can receive two types of events:
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* UWB_EVT_TYPE_NOTIF - notification from the radio controller.
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* UWB_EVT_TYPE_MSG - a simple message.
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*/
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enum uwb_event_type {
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UWB_EVT_TYPE_NOTIF,
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UWB_EVT_TYPE_MSG,
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};
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/**
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* struct uwb_event_notif - an event for a radio controller notification
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* @size: Size of the buffer (ie: Guaranteed to contain at least
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* a full 'struct uwb_rceb')
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* @rceb: Pointer to a kmalloced() event payload
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*/
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struct uwb_event_notif {
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size_t size;
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struct uwb_rceb *rceb;
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};
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/**
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* enum uwb_event_message - an event for a message for asynchronous processing
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*
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* UWB_EVT_MSG_RESET - reset the radio controller and all PAL hardware.
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*/
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enum uwb_event_message {
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UWB_EVT_MSG_RESET,
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};
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/**
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* UWB Event
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* @rc: Radio controller that emitted the event (referenced)
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* @ts_jiffies: Timestamp, when was it received
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* @type: This event's type.
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*/
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struct uwb_event {
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struct list_head list_node;
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struct uwb_rc *rc;
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unsigned long ts_jiffies;
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enum uwb_event_type type;
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union {
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struct uwb_event_notif notif;
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enum uwb_event_message message;
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};
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};
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extern void uwbd_start(void);
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extern void uwbd_stop(void);
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extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
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extern void uwbd_event_queue(struct uwb_event *);
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void uwbd_flush(struct uwb_rc *rc);
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/* UWB event handlers */
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extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
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extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
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extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
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extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
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extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
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extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
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int uwbd_msg_handle_reset(struct uwb_event *evt);
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/*
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* Address management
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*/
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int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
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int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
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/*
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* UWB Beacon Cache
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*
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* Each beacon we received is kept in a cache--when we receive that
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* beacon consistently, that means there is a new device that we have
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* to add to the system.
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*/
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extern unsigned long beacon_timeout_ms;
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/** Beacon cache list */
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struct uwb_beca {
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struct list_head list;
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size_t entries;
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struct mutex mutex;
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};
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extern struct uwb_beca uwb_beca;
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/**
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* Beacon cache entry
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*
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* @jiffies_refresh: last time a beacon was received that refreshed
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* this cache entry.
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* @uwb_dev: device connected to this beacon. This pointer is not
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* safe, you need to get it with uwb_dev_try_get()
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*
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* @hits: how many time we have seen this beacon since last time we
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* cleared it
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*/
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struct uwb_beca_e {
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struct mutex mutex;
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struct kref refcnt;
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struct list_head node;
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struct uwb_mac_addr *mac_addr;
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struct uwb_dev_addr dev_addr;
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u8 hits;
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unsigned long ts_jiffies;
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struct uwb_dev *uwb_dev;
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struct uwb_rc_evt_beacon *be;
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struct stats lqe_stats, rssi_stats; /* radio statistics */
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};
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struct uwb_beacon_frame;
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extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
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char *, size_t);
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extern struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *,
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struct uwb_beacon_frame *,
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unsigned long);
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extern void uwb_bce_kfree(struct kref *_bce);
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static inline void uwb_bce_get(struct uwb_beca_e *bce)
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{
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kref_get(&bce->refcnt);
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}
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static inline void uwb_bce_put(struct uwb_beca_e *bce)
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{
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kref_put(&bce->refcnt, uwb_bce_kfree);
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}
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extern void uwb_beca_purge(void);
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extern void uwb_beca_release(void);
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struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
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const struct uwb_dev_addr *devaddr);
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struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
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const struct uwb_mac_addr *macaddr);
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/* -- UWB Sysfs representation */
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extern struct class uwb_rc_class;
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extern struct device_attribute dev_attr_mac_address;
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extern struct device_attribute dev_attr_beacon;
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extern struct device_attribute dev_attr_scan;
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/* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
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void uwb_rsv_init(struct uwb_rc *rc);
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int uwb_rsv_setup(struct uwb_rc *rc);
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void uwb_rsv_cleanup(struct uwb_rc *rc);
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void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
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void uwb_rsv_remove(struct uwb_rsv *rsv);
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struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
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struct uwb_ie_drp *drp_ie);
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void uwb_rsv_sched_update(struct uwb_rc *rc);
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void uwb_drp_handle_timeout(struct uwb_rsv *rsv);
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int uwb_drp_ie_update(struct uwb_rsv *rsv);
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void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
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void uwb_drp_avail_init(struct uwb_rc *rc);
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int uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
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void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
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void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
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void uwb_drp_avail_ie_update(struct uwb_rc *rc);
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/* -- PAL support */
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void uwb_rc_pal_init(struct uwb_rc *rc);
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/* -- Misc */
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extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
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const struct uwb_mac_frame_hdr *);
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/* -- Debug interface */
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void uwb_dbg_init(void);
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void uwb_dbg_exit(void);
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void uwb_dbg_add_rc(struct uwb_rc *rc);
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void uwb_dbg_del_rc(struct uwb_rc *rc);
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/* Workarounds for version specific stuff */
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static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
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{
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down(&uwb_dev->dev.sem);
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}
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static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
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{
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up(&uwb_dev->dev.sem);
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}
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#endif /* #ifndef __UWB_INTERNAL_H__ */
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