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 extern ssize_t uwb_rc_print_IEs(struct uwb_rc *rc, char *, size_t);
  70 extern void uwb_rc_ie_init(struct uwb_rc *);
  71 extern void uwb_rc_ie_init(struct uwb_rc *);
  72 extern ssize_t uwb_rc_ie_setup(struct uwb_rc *);
  73 extern void uwb_rc_ie_release(struct uwb_rc *);
  74 extern int uwb_rc_ie_add(struct uwb_rc *,
  75                          const struct uwb_ie_hdr *, size_t);
  76 extern int uwb_rc_ie_rm(struct uwb_rc *, enum uwb_ie);
  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 void uwb_rc_neh_create(struct uwb_rc *rc);
  96 void uwb_rc_neh_destroy(struct uwb_rc *rc);
  97
  98 struct uwb_rc_neh *uwb_rc_neh_add(struct uwb_rc *rc, struct uwb_rccb *cmd,
  99                                   u8 expected_type, u16 expected_event,
 100                                   uwb_rc_cmd_cb_f cb, void *arg);
 101 void uwb_rc_neh_rm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 102 void uwb_rc_neh_arm(struct uwb_rc *rc, struct uwb_rc_neh *neh);
 103 void uwb_rc_neh_put(struct uwb_rc_neh *neh);
 104
 105 /* Event size tables */
 106 extern int uwb_est_create(void);
 107 extern void uwb_est_destroy(void);
 108
 109
 110 /*
 111  * UWB Events & management daemon
 112  */
 113
 114 /**
 115  * enum uwb_event_type - types of UWB management daemon events
 116  *
 117  * The UWB management daemon (uwbd) can receive two types of events:
 118  *   UWB_EVT_TYPE_NOTIF - notification from the radio controller.
 119  *   UWB_EVT_TYPE_MSG   - a simple message.
 120  */
 121 enum uwb_event_type {
 122         UWB_EVT_TYPE_NOTIF,
 123         UWB_EVT_TYPE_MSG,
 124 };
 125
 126 /**
 127  * struct uwb_event_notif - an event for a radio controller notification
 128  * @size: Size of the buffer (ie: Guaranteed to contain at least
 129  *        a full 'struct uwb_rceb')
 130  * @rceb: Pointer to a kmalloced() event payload
 131  */
 132 struct uwb_event_notif {
 133         size_t size;
 134         struct uwb_rceb *rceb;
 135 };
 136
 137 /**
 138  * enum uwb_event_message - an event for a message for asynchronous processing
 139  *
 140  * UWB_EVT_MSG_RESET - reset the radio controller and all PAL hardware.
 141  */
 142 enum uwb_event_message {
 143         UWB_EVT_MSG_RESET,
 144 };
 145
 146 /**
 147  * UWB Event
 148  * @rc:         Radio controller that emitted the event (referenced)
 149  * @ts_jiffies: Timestamp, when was it received
 150  * @type:       This event's type.
 151  */
 152 struct uwb_event {
 153         struct list_head list_node;
 154         struct uwb_rc *rc;
 155         unsigned long ts_jiffies;
 156         enum uwb_event_type type;
 157         union {
 158                 struct uwb_event_notif notif;
 159                 enum uwb_event_message message;
 160         };
 161 };
 162
 163 extern void uwbd_start(void);
 164 extern void uwbd_stop(void);
 165 extern struct uwb_event *uwb_event_alloc(size_t, gfp_t gfp_mask);
 166 extern void uwbd_event_queue(struct uwb_event *);
 167 void uwbd_flush(struct uwb_rc *rc);
 168
 169 /* UWB event handlers */
 170 extern int uwbd_evt_handle_rc_beacon(struct uwb_event *);
 171 extern int uwbd_evt_handle_rc_beacon_size(struct uwb_event *);
 172 extern int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *);
 173 extern int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *);
 174 extern int uwbd_evt_handle_rc_drp(struct uwb_event *);
 175 extern int uwbd_evt_handle_rc_drp_avail(struct uwb_event *);
 176
 177 int uwbd_msg_handle_reset(struct uwb_event *evt);
 178
 179
 180 /*
 181  * Address management
 182  */
 183 int uwb_rc_dev_addr_assign(struct uwb_rc *rc);
 184 int uwbd_evt_handle_rc_dev_addr_conflict(struct uwb_event *evt);
 185
 186 /*
 187  * UWB Beacon Cache
 188  *
 189  * Each beacon we received is kept in a cache--when we receive that
 190  * beacon consistently, that means there is a new device that we have
 191  * to add to the system.
 192  */
 193
 194 extern unsigned long beacon_timeout_ms;
 195
 196 /** Beacon cache list */
 197 struct uwb_beca {
 198         struct list_head list;
 199         size_t entries;
 200         struct mutex mutex;
 201 };
 202
 203 extern struct uwb_beca uwb_beca;
 204
 205 /**
 206  * Beacon cache entry
 207  *
 208  * @jiffies_refresh: last time a beacon was  received that refreshed
 209  *                   this cache entry.
 210  * @uwb_dev: device connected to this beacon. This pointer is not
 211  *           safe, you need to get it with uwb_dev_try_get()
 212  *
 213  * @hits: how many time we have seen this beacon since last time we
 214  *        cleared it
 215  */
 216 struct uwb_beca_e {
 217         struct mutex mutex;
 218         struct kref refcnt;
 219         struct list_head node;
 220         struct uwb_mac_addr *mac_addr;
 221         struct uwb_dev_addr dev_addr;
 222         u8 hits;
 223         unsigned long ts_jiffies;
 224         struct uwb_dev *uwb_dev;
 225         struct uwb_rc_evt_beacon *be;
 226         struct stats lqe_stats, rssi_stats;     /* radio statistics */
 227 };
 228 struct uwb_beacon_frame;
 229 extern ssize_t uwb_bce_print_IEs(struct uwb_dev *, struct uwb_beca_e *,
 230                                  char *, size_t);
 231 extern struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *,
 232                                          struct uwb_beacon_frame *,
 233                                          unsigned long);
 234
 235 extern void uwb_bce_kfree(struct kref *_bce);
 236 static inline void uwb_bce_get(struct uwb_beca_e *bce)
 237 {
 238         kref_get(&bce->refcnt);
 239 }
 240 static inline void uwb_bce_put(struct uwb_beca_e *bce)
 241 {
 242         kref_put(&bce->refcnt, uwb_bce_kfree);
 243 }
 244 extern void uwb_beca_purge(void);
 245 extern void uwb_beca_release(void);
 246
 247 struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc,
 248                                        const struct uwb_dev_addr *devaddr);
 249 struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc,
 250                                        const struct uwb_mac_addr *macaddr);
 251
 252 /* -- UWB Sysfs representation */
 253 extern struct class uwb_rc_class;
 254 extern struct device_attribute dev_attr_mac_address;
 255 extern struct device_attribute dev_attr_beacon;
 256 extern struct device_attribute dev_attr_scan;
 257
 258 /* -- DRP Bandwidth allocator: bandwidth allocations, reservations, DRP */
 259 void uwb_rsv_init(struct uwb_rc *rc);
 260 int uwb_rsv_setup(struct uwb_rc *rc);
 261 void uwb_rsv_cleanup(struct uwb_rc *rc);
 262
 263 void uwb_rsv_set_state(struct uwb_rsv *rsv, enum uwb_rsv_state new_state);
 264 void uwb_rsv_remove(struct uwb_rsv *rsv);
 265 struct uwb_rsv *uwb_rsv_find(struct uwb_rc *rc, struct uwb_dev *src,
 266                              struct uwb_ie_drp *drp_ie);
 267 void uwb_rsv_sched_update(struct uwb_rc *rc);
 268
 269 void uwb_drp_handle_timeout(struct uwb_rsv *rsv);
 270 int uwb_drp_ie_update(struct uwb_rsv *rsv);
 271 void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie);
 272
 273 void uwb_drp_avail_init(struct uwb_rc *rc);
 274 int  uwb_drp_avail_reserve_pending(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 275 void uwb_drp_avail_reserve(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 276 void uwb_drp_avail_release(struct uwb_rc *rc, struct uwb_mas_bm *mas);
 277 void uwb_drp_avail_ie_update(struct uwb_rc *rc);
 278
 279 /* -- PAL support */
 280 void uwb_rc_pal_init(struct uwb_rc *rc);
 281
 282 /* -- Misc */
 283
 284 extern ssize_t uwb_mac_frame_hdr_print(char *, size_t,
 285                                        const struct uwb_mac_frame_hdr *);
 286
 287 /* -- Debug interface */
 288 void uwb_dbg_init(void);
 289 void uwb_dbg_exit(void);
 290 void uwb_dbg_add_rc(struct uwb_rc *rc);
 291 void uwb_dbg_del_rc(struct uwb_rc *rc);
 292
 293 /* Workarounds for version specific stuff */
 294
 295 static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
 296 {
 297         down(&uwb_dev->dev.sem);
 298 }
 299
 300 static inline void uwb_dev_unlock(struct uwb_dev *uwb_dev)
 301 {
 302         up(&uwb_dev->dev.sem);
 303 }
 304
 305 #endif /* #ifndef __UWB_INTERNAL_H__ */