drivers/staging/uwb/uwb-internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Ultra Wide Band
   4  * UWB internal API
   5  *
   6  * Copyright (C) 2005-2006 Intel Corporation
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  *
   9  * This contains most of the internal API for UWB. This is stuff used
  10  * across the stack that of course, is of no interest to the rest.
  11  *
  12  * Some parts might end up going public (like uwb_rc_*())...
  13  */
  14
  15 #ifndef __UWB_INTERNAL_H__
  16 #define __UWB_INTERNAL_H__
  17
  18 #include <linux/kernel.h>
  19 #include <linux/device.h>
  20 #include <linux/mutex.h>
  21 #include "uwb.h"
  22
  23 struct uwb_beca_e;
  24
  25 /* General device API */
  26 extern void uwb_dev_init(struct uwb_dev *uwb_dev);
  27 extern int __uwb_dev_offair(struct uwb_dev *, struct uwb_rc *);
  28 extern int uwb_dev_add(struct uwb_dev *uwb_dev, struct device *parent_dev,
  29                        struct uwb_rc *parent_rc);
  30 extern void uwb_dev_rm(struct uwb_dev *uwb_dev);
  31 extern void uwbd_dev_onair(struct uwb_rc *, struct uwb_beca_e *);
  32 extern void uwbd_dev_offair(struct uwb_beca_e *);
  33 void uwb_notify(struct uwb_rc *rc, struct uwb_dev *uwb_dev, enum uwb_notifs event);
  34
  35 /* General UWB Radio Controller Internal API */
  36 extern struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *);
  37 static inline struct uwb_rc *__uwb_rc_get(struct uwb_rc *rc)
  38 {
  39         uwb_dev_get(&rc->uwb_dev);
  40         return rc;
  41 }
  42
  43 static inline void __uwb_rc_put(struct uwb_rc *rc)
  44 {
  45         if (rc)
  46                 uwb_dev_put(&rc->uwb_dev);
  47 }
  48
  49 extern int uwb_rc_reset(struct uwb_rc *rc);
  50 extern int uwb_rc_beacon(struct uwb_rc *rc,
  51                          int channel, unsigned bpst_offset);
  52 extern int uwb_rc_scan(struct uwb_rc *rc,
  53                        unsigned channel, enum uwb_scan_type type,
  54                        unsigned bpst_offset);
  55 extern int uwb_rc_send_all_drp_ie(struct uwb_rc *rc);
  56
  57 void uwb_rc_ie_init(struct uwb_rc *);
  58 int uwb_rc_ie_setup(struct uwb_rc *);
  59 void uwb_rc_ie_release(struct uwb_rc *);
  60 int uwb_ie_dump_hex(const struct uwb_ie_hdr *ies, size_t len,
  61                     char *buf, size_t size);
  62 int uwb_rc_set_ie(struct uwb_rc *, struct uwb_rc_cmd_set_ie *);
  63
  64
  65 extern const char *uwb_rc_strerror(unsigned code);
  66
  67 /*
  68  * Time to wait for a response to an RC command.
  69  *
  70  * Some commands can take a long time to response. e.g., START_BEACON
  71  * may scan for several superframes before joining an existing beacon
  72  * group and this can take around 600 ms.
  73  */
  74 #define UWB_RC_CMD_TIMEOUT_MS 1000 /* ms */
  75
  76 /*
  77  * Notification/Event Handlers
  78  */
  79
  80 struct uwb_rc_neh;
  81
  82 extern int uwb_rc_cmd_async(struct uwb_rc *rc, const char *cmd_name,
  83                             struct uwb_rccb *cmd, size_t cmd_size,
  84                             u8 expected_type, u16 expected_event,
  85                             uwb_rc_cmd_cb_f cb, void *arg);
  86
  87
  88 void uwb_rc_neh_create(struct uwb_rc *rc);
  89 void uwb_rc_neh_destroy(struct uwb_rc *rc);
  90
  91 struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
  92                                   u8 expected_type, u16 expected_event,
  93                                   uwb_rc_cmd_cb_f cb, void *arg);
  94 void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
  95 void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
  96 void uwb_rc_neh_put(struct uwb_rc_neh *neh);
  97
  98 /* Event size tables */
  99 extern int uwb_est_create(void);
 100 extern void uwb_est_destroy(void);
 101
 102 /*
 103  * UWB conflicting alien reservations
 104  */
 105 struct uwb_cnflt_alien {
 106         struct uwb_rc *rc;
 107         struct list_head rc_node;
 108         struct uwb_mas_bm mas;
 109         struct timer_list timer;
 110         struct work_struct cnflt_update_work;
 111 };
 112
 113 enum uwb_uwb_rsv_alloc_result {
 114         UWB_RSV_ALLOC_FOUND = 0,
 115         UWB_RSV_ALLOC_NOT_FOUND,
 116 };
 117
 118 enum uwb_rsv_mas_status {
 119         UWB_RSV_MAS_NOT_AVAIL = 1,
 120         UWB_RSV_MAS_SAFE,
 121         UWB_RSV_MAS_UNSAFE,
 122 };
 123
 124 struct uwb_rsv_col_set_info {
 125         unsigned char start_col;
 126         unsigned char interval;
 127         unsigned char safe_mas_per_col;
 128         unsigned char unsafe_mas_per_col;
 129 };
 130
 131 struct uwb_rsv_col_info {
 132         unsigned char max_avail_safe;
 133         unsigned char max_avail_unsafe;
 134         unsigned char highest_mas[UWB_MAS_PER_ZONE];
 135         struct uwb_rsv_col_set_info csi;
 136 };
 137
 138 struct uwb_rsv_row_info {
 139         unsigned char avail[UWB_MAS_PER_ZONE];
 140         unsigned char free_rows;
 141         unsigned char used_rows;
 142 };
 143
 144 /*
 145  * UWB find allocation
 146  */
 147 struct uwb_rsv_alloc_info {
 148         unsigned char bm[UWB_MAS_PER_ZONE * UWB_NUM_ZONES];
 149         struct uwb_rsv_col_info ci[UWB_NUM_ZONES];
 150         struct uwb_rsv_row_info ri;
 151         struct uwb_mas_bm *not_available;
 152         struct uwb_mas_bm *result;
 153         int min_mas;
 154         int max_mas;
 155         int max_interval;
 156         int total_allocated_mases;
 157         int safe_allocated_mases;
 158         int unsafe_allocated_mases;
 159         int interval;
 160 };
 161
 162 int uwb_rsv_find_best_allocation(struct uwb_rsv *rsv,
 163                                  struct uwb_mas_bm *available,
 164                                  struct uwb_mas_bm *result);
 165 void uwb_rsv_handle_drp_avail_change(struct uwb_rc *rc);
 166 /*
 167  * UWB Events & management daemon
 168  */
 169
 170 /**
 171  * enum uwb_event_type - types of UWB management daemon events
 172  *
 173  * The UWB management daemon (uwbd) can receive two types of events:
 174  *   UWB_EVT_TYPE_NOTIF - notification from the radio controller.
 175  *   UWB_EVT_TYPE_MSG   - a simple message.
 176  */
 177 enum uwb_event_type {
 178         UWB_EVT_TYPE_NOTIF,
 179         UWB_EVT_TYPE_MSG,
 180 };
 181
 182 /**
 183  * struct uwb_event_notif - an event for a radio controller notification
 184  * @size: Size of the buffer (ie: Guaranteed to contain at least
 185  *        a full 'struct uwb_rceb')
 186  * @rceb: Pointer to a kmalloced() event payload
 187  */
 188 struct uwb_event_notif {
 189         size_t size;
 190         struct uwb_rceb *rceb;
 191 };
 192
 193 /**
 194  * enum uwb_event_message - an event for a message for asynchronous processing
 195  *
 196  * UWB_EVT_MSG_RESET - reset the radio controller and all PAL hardware.
 197  */
 198 enum uwb_event_message {
 199         UWB_EVT_MSG_RESET,
 200 };
 201
 202 /**
 203  * UWB Event
 204  * @rc:         Radio controller that emitted the event (referenced)
 205  * @ts_jiffies: Timestamp, when was it received
 206  * @type:       This event's type.
 207  */
 208 struct uwb_event {
 209         struct list_head list_node;
 210         struct uwb_rc *rc;
 211         unsigned long ts_jiffies;
 212         enum uwb_event_type type;
 213         union {
 214                 struct uwb_event_notif notif;
 215                 enum uwb_event_message message;
 216         };
 217 };
 218
 219 extern void uwbd_start(struct uwb_rc *rc);
 220 extern void uwbd_stop(struct uwb_rc *rc);
 221 extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
 222 extern void uwbd_event_queue(struct uwb_event *);
 223 void uwbd_flush(struct uwb_rc *rc);
 224
 225 /* UWB event handlers */
 226 extern int uwbd_evt_handle_rc_ie_rcv(struct uwb_event *);
 227 extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
 228 extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
 229 extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
 230 extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
 231 extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
 232 extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
 233
 234 int uwbd_msg_handle_reset(struct uwb_event *evt);
 235
 236
 237 /*
 238  * Address management
 239  */
 240 int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
 241 int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
 242
 243 /*
 244  * UWB Beacon Cache
 245  *
 246  * Each beacon we received is kept in a cache--when we receive that
 247  * beacon consistently, that means there is a new device that we have
 248  * to add to the system.
 249  */
 250
 251 extern unsigned long beacon_timeout_ms;
 252
 253 /**
 254  * Beacon cache entry
 255  *
 256  * @jiffies_refresh: last time a beacon was  received that refreshed
 257  *                   this cache entry.
 258  * @uwb_dev: device connected to this beacon. This pointer is not
 259  *           safe, you need to get it with uwb_dev_try_get()
 260  *
 261  * @hits: how many time we have seen this beacon since last time we
 262  *        cleared it
 263  */
 264 struct uwb_beca_e {
 265         struct mutex mutex;
 266         struct kref refcnt;
 267         struct list_head node;
 268         struct uwb_mac_addr *mac_addr;
 269         struct uwb_dev_addr dev_addr;
 270         u8 hits;
 271         unsigned long ts_jiffies;
 272         struct uwb_dev *uwb_dev;
 273         struct uwb_rc_evt_beacon *be;
 274         struct stats lqe_stats, rssi_stats;     /* radio statistics */
 275 };
 276 struct uwb_beacon_frame;
 277 extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
 278                                  char *, size_t);
 279
 280 extern void uwb_bce_kfree(struct kref *_bce);
 281 static inline void uwb_bce_get(struct uwb_beca_e *bce)
 282 {
 283         kref_get(&bce->refcnt);
 284 }
 285 static inline void uwb_bce_put(struct uwb_beca_e *bce)
 286 {
 287         kref_put(&bce->refcnt, uwb_bce_kfree);
 288 }
 289 extern void uwb_beca_purge(struct uwb_rc *rc);
 290 extern void uwb_beca_release(struct uwb_rc *rc);
 291
 292 struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
 293                                        const struct uwb_dev_addr *devaddr);
 294 struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
 295                                        const struct uwb_mac_addr *macaddr);
 296
 297 int uwb_radio_setup(struct uwb_rc *rc);
 298 void uwb_radio_reset_state(struct uwb_rc *rc);
 299 void uwb_radio_shutdown(struct uwb_rc *rc);
 300 int uwb_radio_force_channel(struct uwb_rc *rc, int channel);
 301
 302 /* -- UWB Sysfs representation */
 303 extern struct class uwb_rc_class;
 304 extern struct bus_type uwb_bus_type;
 305 extern struct device_attribute dev_attr_mac_address;
 306 extern struct device_attribute dev_attr_beacon;
 307 extern struct device_attribute dev_attr_scan;
 308
 309 /* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
 310 void uwb_rsv_init(struct uwb_rc *rc);
 311 int uwb_rsv_setup(struct uwb_rc *rc);
 312 void uwb_rsv_cleanup(struct uwb_rc *rc);
 313 void uwb_rsv_remove_all(struct uwb_rc *rc);
 314 void uwb_rsv_get(struct uwb_rsv *rsv);
 315 void uwb_rsv_put(struct uwb_rsv *rsv);
 316 bool uwb_rsv_has_two_drp_ies(struct uwb_rsv *rsv);
 317 void uwb_rsv_dump(char *text, struct uwb_rsv *rsv);
 318 int uwb_rsv_try_move(struct uwb_rsv *rsv, struct uwb_mas_bm *available);
 319 void uwb_rsv_backoff_win_timer(struct timer_list *t);
 320 void uwb_rsv_backoff_win_increment(struct uwb_rc *rc);
 321 int uwb_rsv_status(struct uwb_rsv *rsv);
 322 int uwb_rsv_companion_status(struct uwb_rsv *rsv);
 323
 324 void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
 325 void uwb_rsv_remove(struct uwb_rsv *rsv);
 326 struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
 327                              struct uwb_ie_drp *drp_ie);
 328 void uwb_rsv_sched_update(struct uwb_rc *rc);
 329 void uwb_rsv_queue_update(struct uwb_rc *rc);
 330
 331 int uwb_drp_ie_update(struct uwb_rsv *rsv);
 332 void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
 333
 334 void uwb_drp_avail_init(struct uwb_rc *rc);
 335 void uwb_drp_available(struct uwb_rc *rc, struct uwb_mas_bm *avail);
 336 int  uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 337 void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 338 void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 339 void uwb_drp_avail_ie_update(struct uwb_rc *rc);
 340
 341 /* -- PAL support */
 342 void uwb_rc_pal_init(struct uwb_rc *rc);
 343
 344 /* -- Misc */
 345
 346 extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
 347                                        const struct uwb_mac_frame_hdr *);
 348
 349 /* -- Debug interface */
 350 void uwb_dbg_init(void);
 351 void uwb_dbg_exit(void);
 352 void uwb_dbg_add_rc(struct uwb_rc *rc);
 353 void uwb_dbg_del_rc(struct uwb_rc *rc);
 354 struct dentry *uwb_dbg_create_pal_dir(struct uwb_pal *pal);
 355
 356 static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
 357 {
 358         device_lock(&uwb_dev->dev);
 359 }
 360
 361 static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
 362 {
 363         device_unlock(&uwb_dev->dev);
 364 }
 365
 366 #endif /* #ifndef __UWB_INTERNAL_H__ */