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 *);
__uwb_rc_get(struct uwb_rc * 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
__uwb_rc_put(struct uwb_rc * rc)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);
uwb_bce_get(struct uwb_beca_e * bce)293 static inline void uwb_bce_get(struct uwb_beca_e *bce)
294 {
295 kref_get(&bce->refcnt);
296 }
uwb_bce_put(struct uwb_beca_e * bce)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
uwb_dev_lock(struct uwb_dev * uwb_dev)367 static inline void uwb_dev_lock(struct uwb_dev *uwb_dev)
368 {
369 down(&uwb_dev->dev.sem);
370 }
371
uwb_dev_unlock(struct uwb_dev * uwb_dev)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__ */
378