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