linux/drivers/uwb/uwb-internal.h
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   1/*
   2 * Ultra Wide Band
   3 * UWB internal API
   4 *
   5 * Copyright (C) 2005-2006 Intel Corporation
   6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License version
  10 * 2 as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20 * 02110-1301, USA.
  21 *
  22 * This contains most of the internal API for UWB. This is stuff used
  23 * across the stack that of course, is of no interest to the rest.
  24 *
  25 * Some parts might end up going public (like uwb_rc_*())...
  26 */
  27
  28#ifndef __UWB_INTERNAL_H__
  29#define __UWB_INTERNAL_H__
  30
  31#include <linux/kernel.h>
  32#include <linux/device.h>
  33#include <linux/uwb.h>
  34#include <linux/mutex.h>
  35
  36struct uwb_beca_e;
  37
  38/* General device API */
  39extern void uwb_dev_init(struct uwb_dev *uwb_dev);
  40extern int __uwb_dev_offair(struct uwb_dev *, struct uwb_rc *);
  41extern int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
  42                       struct uwb_rc *parent_rc);
  43extern void uwb_dev_rm(struct uwb_dev *uwb_dev);
  44extern void uwbd_dev_onair(struct uwb_rc *, struct uwb_beca_e *);
  45extern void uwbd_dev_offair(struct uwb_beca_e *);
  46void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event);
  47
  48/* General UWB Radio Controller Internal API */
  49extern struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *);
  50static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
  51{
  52        uwb_dev_get(&rc->uwb_dev);
  53        return rc;
  54}
  55
  56static inline void __uwb_rc_put(struct uwb_rc *rc)
  57{
  58        if (rc)
  59                uwb_dev_put(&rc->uwb_dev);
  60}
  61
  62extern int uwb_rc_reset(struct uwb_rc *rc);
  63extern int uwb_rc_beacon(struct uwb_rc *rc,
  64                         int channel, unsigned bpst_offset);
  65extern int uwb_rc_scan(struct uwb_rc *rc,
  66                       unsigned channel, enum uwb_scan_type type,
  67                       unsigned bpst_offset);
  68extern int uwb_rc_send_all_drp_ie(struct uwb_rc *rc);
  69
  70void uwb_rc_ie_init(struct uwb_rc *);
  71int uwb_rc_ie_setup(struct uwb_rc *);
  72void uwb_rc_ie_release(struct uwb_rc *);
  73int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
  74                    char *buf, size_t size);
  75int uwb_rc_set_ie(struct uwb_rc *, struct uwb_rc_cmd_set_ie *);
  76
  77
  78extern const char *uwb_rc_strerror(unsigned code);
  79
  80/*
  81 * Time to wait for a response to an RC command.
  82 *
  83 * Some commands can take a long time to response. e.g., START_BEACON
  84 * may scan for several superframes before joining an existing beacon
  85 * group and this can take around 600 ms.
  86 */
  87#define UWB_RC_CMD_TIMEOUT_MS 1000 /* ms */
  88
  89/*
  90 * Notification/Event Handlers
  91 */
  92
  93struct uwb_rc_neh;
  94
  95extern int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
  96                            struct uwb_rccb *cmd, size_t cmd_size,
  97                            u8 expected_type, u16 expected_event,
  98                            uwb_rc_cmd_cb_f cb, void *arg);
  99
 100
 101void uwb_rc_neh_create(struct uwb_rc *rc);
 102void uwb_rc_neh_destroy(struct uwb_rc *rc);
 103
 104struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
 105                                  u8 expected_type, u16 expected_event,
 106                                  uwb_rc_cmd_cb_f cb, void *arg);
 107void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 108void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 109void uwb_rc_neh_put(struct uwb_rc_neh *neh);
 110
 111/* Event size tables */
 112extern int uwb_est_create(void);
 113extern void uwb_est_destroy(void);
 114
 115/*
 116 * UWB conflicting alien reservations
 117 */
 118struct uwb_cnflt_alien {
 119        struct uwb_rc *rc;
 120        struct list_head rc_node;
 121        struct uwb_mas_bm mas;
 122        struct timer_list timer;
 123        struct work_struct cnflt_update_work;
 124};
 125
 126enum uwb_uwb_rsv_alloc_result {
 127        UWB_RSV_ALLOC_FOUND = 0,
 128        UWB_RSV_ALLOC_NOT_FOUND,
 129};
 130
 131enum uwb_rsv_mas_status {
 132        UWB_RSV_MAS_NOT_AVAIL = 1,
 133        UWB_RSV_MAS_SAFE,
 134        UWB_RSV_MAS_UNSAFE,
 135};
 136
 137struct uwb_rsv_col_set_info {
 138        unsigned char start_col;
 139        unsigned char interval;
 140        unsigned char safe_mas_per_col;
 141        unsigned char unsafe_mas_per_col;
 142};
 143
 144struct uwb_rsv_col_info {
 145        unsigned char max_avail_safe;
 146        unsigned char max_avail_unsafe;
 147        unsigned char highest_mas[UWB_MAS_PER_ZONE];
 148        struct uwb_rsv_col_set_info csi;
 149};
 150
 151struct uwb_rsv_row_info {
 152        unsigned char avail[UWB_MAS_PER_ZONE];
 153        unsigned char free_rows;
 154        unsigned char used_rows;
 155};
 156
 157/*
 158 * UWB find allocation
 159 */
 160struct uwb_rsv_alloc_info {
 161        unsigned char bm[UWB_MAS_PER_ZONE * UWB_NUM_ZONES];
 162        struct uwb_rsv_col_info ci[UWB_NUM_ZONES];
 163        struct uwb_rsv_row_info ri;
 164        struct uwb_mas_bm *not_available;
 165        struct uwb_mas_bm *result;
 166        int min_mas;
 167        int max_mas;
 168        int max_interval;
 169        int total_allocated_mases;
 170        int safe_allocated_mases;
 171        int unsafe_allocated_mases;
 172        int interval;
 173};
 174
 175int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv, struct uwb_mas_bm *available, 
 176                                 struct uwb_mas_bm *result);
 177void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc);
 178/*
 179 * UWB Events & management daemon
 180 */
 181
 182/**
 183 * enum uwb_event_type - types of UWB management daemon events
 184 *
 185 * The UWB management daemon (uwbd) can receive two types of events:
 186 *   UWB_EVT_TYPE_NOTIF - notification from the radio controller.
 187 *   UWB_EVT_TYPE_MSG   - a simple message.
 188 */
 189enum uwb_event_type {
 190        UWB_EVT_TYPE_NOTIF,
 191        UWB_EVT_TYPE_MSG,
 192};
 193
 194/**
 195 * struct uwb_event_notif - an event for a radio controller notification
 196 * @size: Size of the buffer (ie: Guaranteed to contain at least
 197 *        a full 'struct uwb_rceb')
 198 * @rceb: Pointer to a kmalloced() event payload
 199 */
 200struct uwb_event_notif {
 201        size_t size;
 202        struct uwb_rceb *rceb;
 203};
 204
 205/**
 206 * enum uwb_event_message - an event for a message for asynchronous processing
 207 *
 208 * UWB_EVT_MSG_RESET - reset the radio controller and all PAL hardware.
 209 */
 210enum uwb_event_message {
 211        UWB_EVT_MSG_RESET,
 212};
 213
 214/**
 215 * UWB Event
 216 * @rc:         Radio controller that emitted the event (referenced)
 217 * @ts_jiffies: Timestamp, when was it received
 218 * @type:       This event's type.
 219 */
 220struct uwb_event {
 221        struct list_head list_node;
 222        struct uwb_rc *rc;
 223        unsigned long ts_jiffies;
 224        enum uwb_event_type type;
 225        union {
 226                struct uwb_event_notif notif;
 227                enum uwb_event_message message;
 228        };
 229};
 230
 231extern void uwbd_start(struct uwb_rc *rc);
 232extern void uwbd_stop(struct uwb_rc *rc);
 233extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
 234extern void uwbd_event_queue(struct uwb_event *);
 235void uwbd_flush(struct uwb_rc *rc);
 236
 237/* UWB event handlers */
 238extern int uwbd_evt_handle_rc_ie_rcv(struct uwb_event *);
 239extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
 240extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
 241extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
 242extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
 243extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
 244extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
 245
 246int uwbd_msg_handle_reset(struct uwb_event *evt);
 247
 248
 249/*
 250 * Address management
 251 */
 252int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
 253int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
 254
 255/*
 256 * UWB Beacon Cache
 257 *
 258 * Each beacon we received is kept in a cache--when we receive that
 259 * beacon consistently, that means there is a new device that we have
 260 * to add to the system.
 261 */
 262
 263extern unsigned long beacon_timeout_ms;
 264
 265/**
 266 * Beacon cache entry
 267 *
 268 * @jiffies_refresh: last time a beacon was  received that refreshed
 269 *                   this cache entry.
 270 * @uwb_dev: device connected to this beacon. This pointer is not
 271 *           safe, you need to get it with uwb_dev_try_get()
 272 *
 273 * @hits: how many time we have seen this beacon since last time we
 274 *        cleared it
 275 */
 276struct uwb_beca_e {
 277        struct mutex mutex;
 278        struct kref refcnt;
 279        struct list_head node;
 280        struct uwb_mac_addr *mac_addr;
 281        struct uwb_dev_addr dev_addr;
 282        u8 hits;
 283        unsigned long ts_jiffies;
 284        struct uwb_dev *uwb_dev;
 285        struct uwb_rc_evt_beacon *be;
 286        struct stats lqe_stats, rssi_stats;     /* radio statistics */
 287};
 288struct uwb_beacon_frame;
 289extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
 290                                 char *, size_t);
 291
 292extern void uwb_bce_kfree(struct kref *_bce);
 293static inline void uwb_bce_get(struct uwb_beca_e *bce)
 294{
 295        kref_get(&bce->refcnt);
 296}
 297static inline void uwb_bce_put(struct uwb_beca_e *bce)
 298{
 299        kref_put(&bce->refcnt, uwb_bce_kfree);
 300}
 301extern void uwb_beca_purge(struct uwb_rc *rc);
 302extern void uwb_beca_release(struct uwb_rc *rc);
 303
 304struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
 305                                       const struct uwb_dev_addr *devaddr);
 306struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
 307                                       const struct uwb_mac_addr *macaddr);
 308
 309int uwb_radio_setup(struct uwb_rc *rc);
 310void uwb_radio_reset_state(struct uwb_rc *rc);
 311void uwb_radio_shutdown(struct uwb_rc *rc);
 312int uwb_radio_force_channel(struct uwb_rc *rc, int channel);
 313
 314/* -- UWB Sysfs representation */
 315extern struct class uwb_rc_class;
 316extern struct device_attribute dev_attr_mac_address;
 317extern struct device_attribute dev_attr_beacon;
 318extern struct device_attribute dev_attr_scan;
 319
 320/* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
 321void uwb_rsv_init(struct uwb_rc *rc);
 322int uwb_rsv_setup(struct uwb_rc *rc);
 323void uwb_rsv_cleanup(struct uwb_rc *rc);
 324void uwb_rsv_remove_all(struct uwb_rc *rc);
 325void uwb_rsv_get(struct uwb_rsv *rsv);
 326void uwb_rsv_put(struct uwb_rsv *rsv);
 327bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv);
 328void uwb_rsv_dump(char *text, struct uwb_rsv *rsv);
 329int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available);
 330void uwb_rsv_backoff_win_timer(unsigned long arg);
 331void uwb_rsv_backoff_win_increment(struct uwb_rc *rc);
 332int uwb_rsv_status(struct uwb_rsv *rsv);
 333int uwb_rsv_companion_status(struct uwb_rsv *rsv);
 334
 335void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
 336void uwb_rsv_remove(struct uwb_rsv *rsv);
 337struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
 338                             struct uwb_ie_drp *drp_ie);
 339void uwb_rsv_sched_update(struct uwb_rc *rc);
 340void uwb_rsv_queue_update(struct uwb_rc *rc);
 341
 342int uwb_drp_ie_update(struct uwb_rsv *rsv);
 343void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
 344
 345void uwb_drp_avail_init(struct uwb_rc *rc);
 346void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail);
 347int  uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 348void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 349void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 350void uwb_drp_avail_ie_update(struct uwb_rc *rc);
 351
 352/* -- PAL support */
 353void uwb_rc_pal_init(struct uwb_rc *rc);
 354
 355/* -- Misc */
 356
 357extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
 358                                       const struct uwb_mac_frame_hdr *);
 359
 360/* -- Debug interface */
 361void uwb_dbg_init(void);
 362void uwb_dbg_exit(void);
 363void uwb_dbg_add_rc(struct uwb_rc *rc);
 364void uwb_dbg_del_rc(struct uwb_rc *rc);
 365struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal);
 366
 367static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
 368{
 369        device_lock(&uwb_dev->dev);
 370}
 371
 372static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
 373{
 374        device_unlock(&uwb_dev->dev);
 375}
 376
 377#endif /* #ifndef __UWB_INTERNAL_H__ */
 378
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