drivers/uwb/uwb-internal.h

   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/version.h>
  32 #include <linux/kernel.h>
  33 #include <linux/device.h>
  34 #include <linux/uwb.h>
  35 #include <linux/mutex.h>
  36
  37 struct uwb_beca_e;
  38
  39 /* General device API */
  40 extern void uwb_dev_init(struct uwb_dev *uwb_dev);
  41 extern int __uwb_dev_offair(struct uwb_dev *, struct uwb_rc *);
  42 extern int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
  43                        struct uwb_rc *parent_rc);
  44 extern void uwb_dev_rm(struct uwb_dev *uwb_dev);
  45 extern void uwbd_dev_onair(struct uwb_rc *, struct uwb_beca_e *);
  46 extern void uwbd_dev_offair(struct uwb_beca_e *);
  47 void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event);
  48
  49 /* General UWB Radio Controller Internal API */
  50 extern struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *);
  51 static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
  52 {
  53         uwb_dev_get(&rc->uwb_dev);
  54         return rc;
  55 }
  56
  57 static inline void __uwb_rc_put(struct uwb_rc *rc)
  58 {
  59         uwb_dev_put(&rc->uwb_dev);
  60 }
  61
  62 extern int uwb_rc_reset(struct uwb_rc *rc);
  63 extern int uwb_rc_beacon(struct uwb_rc *rc,
  64                          int channel, unsigned bpst_offset);
  65 extern int uwb_rc_scan(struct uwb_rc *rc,
  66                        unsigned channel, enum uwb_scan_type type,
  67                        unsigned bpst_offset);
  68 extern int uwb_rc_send_all_drp_ie(struct uwb_rc *rc);
  69
  70 void uwb_rc_ie_init(struct uwb_rc *);
  71 int uwb_rc_ie_setup(struct uwb_rc *);
  72 void uwb_rc_ie_release(struct uwb_rc *);
  73 int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
  74                     char *buf, size_t size);
  75 int uwb_rc_set_ie(struct uwb_rc *, struct uwb_rc_cmd_set_ie *);
  76
  77
  78 extern 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
  93 struct uwb_rc_neh;
  94
  95 extern 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
 101 void uwb_rc_neh_create(struct uwb_rc *rc);
 102 void uwb_rc_neh_destroy(struct uwb_rc *rc);
 103
 104 struct 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);
 107 void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 108 void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 109 void uwb_rc_neh_put(struct uwb_rc_neh *neh);
 110
 111 /* Event size tables */
 112 extern int uwb_est_create(void);
 113 extern void uwb_est_destroy(void);
 114
 115 /*
 116  * UWB conflicting alien reservations
 117  */
 118 struct 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
 126 enum uwb_uwb_rsv_alloc_result {
 127         UWB_RSV_ALLOC_FOUND = 0,
 128         UWB_RSV_ALLOC_NOT_FOUND,
 129 };
 130
 131 enum uwb_rsv_mas_status {
 132         UWB_RSV_MAS_NOT_AVAIL = 1,
 133         UWB_RSV_MAS_SAFE,
 134         UWB_RSV_MAS_UNSAFE,
 135 };
 136
 137 struct 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
 144 struct 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
 151 struct 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  */
 160 struct 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
 175 int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv, struct uwb_mas_bm *available,
 176                                  struct uwb_mas_bm *result);
 177 void 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  */
 189 enum 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  */
 200 struct 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  */
 210 enum 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  */
 220 struct 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
 231 extern void uwbd_start(struct uwb_rc *rc);
 232 extern void uwbd_stop(struct uwb_rc *rc);
 233 extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
 234 extern void uwbd_event_queue(struct uwb_event *);
 235 void uwbd_flush(struct uwb_rc *rc);
 236
 237 /* UWB event handlers */
 238 extern int uwbd_evt_handle_rc_ie_rcv(struct uwb_event *);
 239 extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
 240 extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
 241 extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
 242 extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
 243 extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
 244 extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
 245
 246 int uwbd_msg_handle_reset(struct uwb_event *evt);
 247
 248
 249 /*
 250  * Address management
 251  */
 252 int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
 253 int 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
 263 extern 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  */
 276 struct 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 };
 288 struct uwb_beacon_frame;
 289 extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
 290                                  char *, size_t);
 291
 292 extern void uwb_bce_kfree(struct kref *_bce);
 293 static inline void uwb_bce_get(struct uwb_beca_e *bce)
 294 {
 295         kref_get(&bce->refcnt);
 296 }
 297 static inline void uwb_bce_put(struct uwb_beca_e *bce)
 298 {
 299         kref_put(&bce->refcnt, uwb_bce_kfree);
 300 }
 301 extern void uwb_beca_purge(struct uwb_rc *rc);
 302 extern void uwb_beca_release(struct uwb_rc *rc);
 303
 304 struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
 305                                        const struct uwb_dev_addr *devaddr);
 306 struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
 307                                        const struct uwb_mac_addr *macaddr);
 308
 309 int uwb_radio_setup(struct uwb_rc *rc);
 310 void uwb_radio_reset_state(struct uwb_rc *rc);
 311 void uwb_radio_shutdown(struct uwb_rc *rc);
 312 int uwb_radio_force_channel(struct uwb_rc *rc, int channel);
 313
 314 /* -- UWB Sysfs representation */
 315 extern struct class uwb_rc_class;
 316 extern struct device_attribute dev_attr_mac_address;
 317 extern struct device_attribute dev_attr_beacon;
 318 extern struct device_attribute dev_attr_scan;
 319
 320 /* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
 321 void uwb_rsv_init(struct uwb_rc *rc);
 322 int uwb_rsv_setup(struct uwb_rc *rc);
 323 void uwb_rsv_cleanup(struct uwb_rc *rc);
 324 void uwb_rsv_remove_all(struct uwb_rc *rc);
 325 void uwb_rsv_get(struct uwb_rsv *rsv);
 326 void uwb_rsv_put(struct uwb_rsv *rsv);
 327 bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv);
 328 void uwb_rsv_dump(char *text, struct uwb_rsv *rsv);
 329 int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available);
 330 void uwb_rsv_backoff_win_timer(unsigned long arg);
 331 void uwb_rsv_backoff_win_increment(struct uwb_rc *rc);
 332 int uwb_rsv_status(struct uwb_rsv *rsv);
 333 int uwb_rsv_companion_status(struct uwb_rsv *rsv);
 334
 335 void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
 336 void uwb_rsv_remove(struct uwb_rsv *rsv);
 337 struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
 338                              struct uwb_ie_drp *drp_ie);
 339 void uwb_rsv_sched_update(struct uwb_rc *rc);
 340 void uwb_rsv_queue_update(struct uwb_rc *rc);
 341
 342 int uwb_drp_ie_update(struct uwb_rsv *rsv);
 343 void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
 344
 345 void uwb_drp_avail_init(struct uwb_rc *rc);
 346 void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail);
 347 int  uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 348 void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 349 void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 350 void uwb_drp_avail_ie_update(struct uwb_rc *rc);
 351
 352 /* -- PAL support */
 353 void uwb_rc_pal_init(struct uwb_rc *rc);
 354
 355 /* -- Misc */
 356
 357 extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
 358                                        const struct uwb_mac_frame_hdr *);
 359
 360 /* -- Debug interface */
 361 void uwb_dbg_init(void);
 362 void uwb_dbg_exit(void);
 363 void uwb_dbg_add_rc(struct uwb_rc *rc);
 364 void uwb_dbg_del_rc(struct uwb_rc *rc);
 365 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal);
 366
 367 static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
 368 {
 369         down(&uwb_dev->dev.sem);
 370 }
 371
 372 static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
 373 {
 374         up(&uwb_dev->dev.sem);
 375 }
 376
 377 #endif /* #ifndef __UWB_INTERNAL_H__ */