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Linux 5.1.15
[linux/fpc-iii.git] / drivers / isdn / gigaset / ev-layer.c
blob182826e9d07c58437cd40a3368f2d177282e83c2
1 /*
2 * Stuff used by all variants of the driver
3 *
4 * Copyright (c) 2001 by Stefan Eilers,
5 * Hansjoerg Lipp <hjlipp@web.de>,
6 * Tilman Schmidt <tilman@imap.cc>.
7 *
8 * =====================================================================
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 * =====================================================================
14 */
15
16 #include <linux/export.h>
17 #include "gigaset.h"
18
19 /* ========================================================== */
20 /* bit masks for pending commands */
21 #define PC_DIAL 0x001
22 #define PC_HUP 0x002
23 #define PC_INIT 0x004
24 #define PC_DLE0 0x008
25 #define PC_DLE1 0x010
26 #define PC_SHUTDOWN 0x020
27 #define PC_ACCEPT 0x040
28 #define PC_CID 0x080
29 #define PC_NOCID 0x100
30 #define PC_CIDMODE 0x200
31 #define PC_UMMODE 0x400
32
33 /* types of modem responses */
34 #define RT_NOTHING 0
35 #define RT_ZSAU 1
36 #define RT_RING 2
37 #define RT_NUMBER 3
38 #define RT_STRING 4
39 #define RT_ZCAU 6
40
41 /* Possible ASCII responses */
42 #define RSP_OK 0
43 #define RSP_ERROR 1
44 #define RSP_ZGCI 3
45 #define RSP_RING 4
46 #define RSP_ZVLS 5
47 #define RSP_ZCAU 6
48
49 /* responses with values to store in at_state */
50 /* - numeric */
51 #define RSP_VAR 100
52 #define RSP_ZSAU (RSP_VAR + VAR_ZSAU)
53 #define RSP_ZDLE (RSP_VAR + VAR_ZDLE)
54 #define RSP_ZCTP (RSP_VAR + VAR_ZCTP)
55 /* - string */
56 #define RSP_STR (RSP_VAR + VAR_NUM)
57 #define RSP_NMBR (RSP_STR + STR_NMBR)
58 #define RSP_ZCPN (RSP_STR + STR_ZCPN)
59 #define RSP_ZCON (RSP_STR + STR_ZCON)
60 #define RSP_ZBC (RSP_STR + STR_ZBC)
61 #define RSP_ZHLC (RSP_STR + STR_ZHLC)
62
63 #define RSP_WRONG_CID -2 /* unknown cid in cmd */
64 #define RSP_INVAL -6 /* invalid response */
65 #define RSP_NODEV -9 /* device not connected */
66
67 #define RSP_NONE -19
68 #define RSP_STRING -20
69 #define RSP_NULL -21
70 #define RSP_INIT -27
71 #define RSP_ANY -26
72 #define RSP_LAST -28
73
74 /* actions for process_response */
75 #define ACT_NOTHING 0
76 #define ACT_SETDLE1 1
77 #define ACT_SETDLE0 2
78 #define ACT_FAILINIT 3
79 #define ACT_HUPMODEM 4
80 #define ACT_CONFIGMODE 5
81 #define ACT_INIT 6
82 #define ACT_DLE0 7
83 #define ACT_DLE1 8
84 #define ACT_FAILDLE0 9
85 #define ACT_FAILDLE1 10
86 #define ACT_RING 11
87 #define ACT_CID 12
88 #define ACT_FAILCID 13
89 #define ACT_SDOWN 14
90 #define ACT_FAILSDOWN 15
91 #define ACT_DEBUG 16
92 #define ACT_WARN 17
93 #define ACT_DIALING 18
94 #define ACT_ABORTDIAL 19
95 #define ACT_DISCONNECT 20
96 #define ACT_CONNECT 21
97 #define ACT_REMOTEREJECT 22
98 #define ACT_CONNTIMEOUT 23
99 #define ACT_REMOTEHUP 24
100 #define ACT_ABORTHUP 25
101 #define ACT_ICALL 26
102 #define ACT_ACCEPTED 27
103 #define ACT_ABORTACCEPT 28
104 #define ACT_TIMEOUT 29
105 #define ACT_GETSTRING 30
106 #define ACT_SETVER 31
107 #define ACT_FAILVER 32
108 #define ACT_GOTVER 33
109 #define ACT_TEST 34
110 #define ACT_ERROR 35
111 #define ACT_ABORTCID 36
112 #define ACT_ZCAU 37
113 #define ACT_NOTIFY_BC_DOWN 38
114 #define ACT_NOTIFY_BC_UP 39
115 #define ACT_DIAL 40
116 #define ACT_ACCEPT 41
117 #define ACT_HUP 43
118 #define ACT_IF_LOCK 44
119 #define ACT_START 45
120 #define ACT_STOP 46
121 #define ACT_FAKEDLE0 47
122 #define ACT_FAKEHUP 48
123 #define ACT_FAKESDOWN 49
124 #define ACT_SHUTDOWN 50
125 #define ACT_PROC_CIDMODE 51
126 #define ACT_UMODESET 52
127 #define ACT_FAILUMODE 53
128 #define ACT_CMODESET 54
129 #define ACT_FAILCMODE 55
130 #define ACT_IF_VER 56
131 #define ACT_CMD 100
132
133 /* at command sequences */
134 #define SEQ_NONE 0
135 #define SEQ_INIT 100
136 #define SEQ_DLE0 200
137 #define SEQ_DLE1 250
138 #define SEQ_CID 300
139 #define SEQ_NOCID 350
140 #define SEQ_HUP 400
141 #define SEQ_DIAL 600
142 #define SEQ_ACCEPT 720
143 #define SEQ_SHUTDOWN 500
144 #define SEQ_CIDMODE 10
145 #define SEQ_UMMODE 11
146
147
148 /* 100: init, 200: dle0, 250:dle1, 300: get cid (dial), 350: "hup" (no cid),
149 * 400: hup, 500: reset, 600: dial, 700: ring */
150 struct reply_t gigaset_tab_nocid[] =
151 {
152 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
153 * action, command */
154
155 /* initialize device, set cid mode if possible */
156 {RSP_INIT, -1, -1, SEQ_INIT, 100, 1, {ACT_TIMEOUT} },
157
158 {EV_TIMEOUT, 100, 100, -1, 101, 3, {0}, "Z\r"},
159 {RSP_OK, 101, 103, -1, 120, 5, {ACT_GETSTRING},
160 "+GMR\r"},
161
162 {EV_TIMEOUT, 101, 101, -1, 102, 5, {0}, "Z\r"},
163 {RSP_ERROR, 101, 101, -1, 102, 5, {0}, "Z\r"},
164
165 {EV_TIMEOUT, 102, 102, -1, 108, 5, {ACT_SETDLE1},
166 "^SDLE=0\r"},
167 {RSP_OK, 108, 108, -1, 104, -1},
168 {RSP_ZDLE, 104, 104, 0, 103, 5, {0}, "Z\r"},
169 {EV_TIMEOUT, 104, 104, -1, 0, 0, {ACT_FAILINIT} },
170 {RSP_ERROR, 108, 108, -1, 0, 0, {ACT_FAILINIT} },
171
172 {EV_TIMEOUT, 108, 108, -1, 105, 2, {ACT_SETDLE0,
173 ACT_HUPMODEM,
174 ACT_TIMEOUT} },
175 {EV_TIMEOUT, 105, 105, -1, 103, 5, {0}, "Z\r"},
176
177 {RSP_ERROR, 102, 102, -1, 107, 5, {0}, "^GETPRE\r"},
178 {RSP_OK, 107, 107, -1, 0, 0, {ACT_CONFIGMODE} },
179 {RSP_ERROR, 107, 107, -1, 0, 0, {ACT_FAILINIT} },
180 {EV_TIMEOUT, 107, 107, -1, 0, 0, {ACT_FAILINIT} },
181
182 {RSP_ERROR, 103, 103, -1, 0, 0, {ACT_FAILINIT} },
183 {EV_TIMEOUT, 103, 103, -1, 0, 0, {ACT_FAILINIT} },
184
185 {RSP_STRING, 120, 120, -1, 121, -1, {ACT_SETVER} },
186
187 {EV_TIMEOUT, 120, 121, -1, 0, 0, {ACT_FAILVER,
188 ACT_INIT} },
189 {RSP_ERROR, 120, 121, -1, 0, 0, {ACT_FAILVER,
190 ACT_INIT} },
191 {RSP_OK, 121, 121, -1, 0, 0, {ACT_GOTVER,
192 ACT_INIT} },
193 {RSP_NONE, 121, 121, -1, 120, 0, {ACT_GETSTRING} },
194
195 /* leave dle mode */
196 {RSP_INIT, 0, 0, SEQ_DLE0, 201, 5, {0}, "^SDLE=0\r"},
197 {RSP_OK, 201, 201, -1, 202, -1},
198 {RSP_ZDLE, 202, 202, 0, 0, 0, {ACT_DLE0} },
199 {RSP_NODEV, 200, 249, -1, 0, 0, {ACT_FAKEDLE0} },
200 {RSP_ERROR, 200, 249, -1, 0, 0, {ACT_FAILDLE0} },
201 {EV_TIMEOUT, 200, 249, -1, 0, 0, {ACT_FAILDLE0} },
202
203 /* enter dle mode */
204 {RSP_INIT, 0, 0, SEQ_DLE1, 251, 5, {0}, "^SDLE=1\r"},
205 {RSP_OK, 251, 251, -1, 252, -1},
206 {RSP_ZDLE, 252, 252, 1, 0, 0, {ACT_DLE1} },
207 {RSP_ERROR, 250, 299, -1, 0, 0, {ACT_FAILDLE1} },
208 {EV_TIMEOUT, 250, 299, -1, 0, 0, {ACT_FAILDLE1} },
209
210 /* incoming call */
211 {RSP_RING, -1, -1, -1, -1, -1, {ACT_RING} },
212
213 /* get cid */
214 {RSP_INIT, 0, 0, SEQ_CID, 301, 5, {0}, "^SGCI?\r"},
215 {RSP_OK, 301, 301, -1, 302, -1},
216 {RSP_ZGCI, 302, 302, -1, 0, 0, {ACT_CID} },
217 {RSP_ERROR, 301, 349, -1, 0, 0, {ACT_FAILCID} },
218 {EV_TIMEOUT, 301, 349, -1, 0, 0, {ACT_FAILCID} },
219
220 /* enter cid mode */
221 {RSP_INIT, 0, 0, SEQ_CIDMODE, 150, 5, {0}, "^SGCI=1\r"},
222 {RSP_OK, 150, 150, -1, 0, 0, {ACT_CMODESET} },
223 {RSP_ERROR, 150, 150, -1, 0, 0, {ACT_FAILCMODE} },
224 {EV_TIMEOUT, 150, 150, -1, 0, 0, {ACT_FAILCMODE} },
225
226 /* leave cid mode */
227 {RSP_INIT, 0, 0, SEQ_UMMODE, 160, 5, {0}, "Z\r"},
228 {RSP_OK, 160, 160, -1, 0, 0, {ACT_UMODESET} },
229 {RSP_ERROR, 160, 160, -1, 0, 0, {ACT_FAILUMODE} },
230 {EV_TIMEOUT, 160, 160, -1, 0, 0, {ACT_FAILUMODE} },
231
232 /* abort getting cid */
233 {RSP_INIT, 0, 0, SEQ_NOCID, 0, 0, {ACT_ABORTCID} },
234
235 /* reset */
236 {RSP_INIT, 0, 0, SEQ_SHUTDOWN, 504, 5, {0}, "Z\r"},
237 {RSP_OK, 504, 504, -1, 0, 0, {ACT_SDOWN} },
238 {RSP_ERROR, 501, 599, -1, 0, 0, {ACT_FAILSDOWN} },
239 {EV_TIMEOUT, 501, 599, -1, 0, 0, {ACT_FAILSDOWN} },
240 {RSP_NODEV, 501, 599, -1, 0, 0, {ACT_FAKESDOWN} },
241
242 {EV_PROC_CIDMODE, -1, -1, -1, -1, -1, {ACT_PROC_CIDMODE} },
243 {EV_IF_LOCK, -1, -1, -1, -1, -1, {ACT_IF_LOCK} },
244 {EV_IF_VER, -1, -1, -1, -1, -1, {ACT_IF_VER} },
245 {EV_START, -1, -1, -1, -1, -1, {ACT_START} },
246 {EV_STOP, -1, -1, -1, -1, -1, {ACT_STOP} },
247 {EV_SHUTDOWN, -1, -1, -1, -1, -1, {ACT_SHUTDOWN} },
248
249 /* misc. */
250 {RSP_ERROR, -1, -1, -1, -1, -1, {ACT_ERROR} },
251 {RSP_ZCAU, -1, -1, -1, -1, -1, {ACT_ZCAU} },
252 {RSP_NONE, -1, -1, -1, -1, -1, {ACT_DEBUG} },
253 {RSP_ANY, -1, -1, -1, -1, -1, {ACT_WARN} },
254 {RSP_LAST}
255 };
256
257 /* 600: start dialing, 650: dial in progress, 800: connection is up, 700: ring,
258 * 400: hup, 750: accepted icall */
259 struct reply_t gigaset_tab_cid[] =
260 {
261 /* resp_code, min_ConState, max_ConState, parameter, new_ConState, timeout,
262 * action, command */
263
264 /* dial */
265 {EV_DIAL, -1, -1, -1, -1, -1, {ACT_DIAL} },
266 {RSP_INIT, 0, 0, SEQ_DIAL, 601, 5, {ACT_CMD + AT_BC} },
267 {RSP_OK, 601, 601, -1, 603, 5, {ACT_CMD + AT_PROTO} },
268 {RSP_OK, 603, 603, -1, 604, 5, {ACT_CMD + AT_TYPE} },
269 {RSP_OK, 604, 604, -1, 605, 5, {ACT_CMD + AT_MSN} },
270 {RSP_NULL, 605, 605, -1, 606, 5, {ACT_CMD + AT_CLIP} },
271 {RSP_OK, 605, 605, -1, 606, 5, {ACT_CMD + AT_CLIP} },
272 {RSP_NULL, 606, 606, -1, 607, 5, {ACT_CMD + AT_ISO} },
273 {RSP_OK, 606, 606, -1, 607, 5, {ACT_CMD + AT_ISO} },
274 {RSP_OK, 607, 607, -1, 608, 5, {0}, "+VLS=17\r"},
275 {RSP_OK, 608, 608, -1, 609, -1},
276 {RSP_ZSAU, 609, 609, ZSAU_PROCEEDING, 610, 5, {ACT_CMD + AT_DIAL} },
277 {RSP_OK, 610, 610, -1, 650, 0, {ACT_DIALING} },
278
279 {RSP_ERROR, 601, 610, -1, 0, 0, {ACT_ABORTDIAL} },
280 {EV_TIMEOUT, 601, 610, -1, 0, 0, {ACT_ABORTDIAL} },
281
282 /* optional dialing responses */
283 {EV_BC_OPEN, 650, 650, -1, 651, -1},
284 {RSP_ZVLS, 609, 651, 17, -1, -1, {ACT_DEBUG} },
285 {RSP_ZCTP, 610, 651, -1, -1, -1, {ACT_DEBUG} },
286 {RSP_ZCPN, 610, 651, -1, -1, -1, {ACT_DEBUG} },
287 {RSP_ZSAU, 650, 651, ZSAU_CALL_DELIVERED, -1, -1, {ACT_DEBUG} },
288
289 /* connect */
290 {RSP_ZSAU, 650, 650, ZSAU_ACTIVE, 800, -1, {ACT_CONNECT} },
291 {RSP_ZSAU, 651, 651, ZSAU_ACTIVE, 800, -1, {ACT_CONNECT,
292 ACT_NOTIFY_BC_UP} },
293 {RSP_ZSAU, 750, 750, ZSAU_ACTIVE, 800, -1, {ACT_CONNECT} },
294 {RSP_ZSAU, 751, 751, ZSAU_ACTIVE, 800, -1, {ACT_CONNECT,
295 ACT_NOTIFY_BC_UP} },
296 {EV_BC_OPEN, 800, 800, -1, 800, -1, {ACT_NOTIFY_BC_UP} },
297
298 /* remote hangup */
299 {RSP_ZSAU, 650, 651, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEREJECT} },
300 {RSP_ZSAU, 750, 751, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEHUP} },
301 {RSP_ZSAU, 800, 800, ZSAU_DISCONNECT_IND, 0, 0, {ACT_REMOTEHUP} },
302
303 /* hangup */
304 {EV_HUP, -1, -1, -1, -1, -1, {ACT_HUP} },
305 {RSP_INIT, -1, -1, SEQ_HUP, 401, 5, {0}, "+VLS=0\r"},
306 {RSP_OK, 401, 401, -1, 402, 5},
307 {RSP_ZVLS, 402, 402, 0, 403, 5},
308 {RSP_ZSAU, 403, 403, ZSAU_DISCONNECT_REQ, -1, -1, {ACT_DEBUG} },
309 {RSP_ZSAU, 403, 403, ZSAU_NULL, 0, 0, {ACT_DISCONNECT} },
310 {RSP_NODEV, 401, 403, -1, 0, 0, {ACT_FAKEHUP} },
311 {RSP_ERROR, 401, 401, -1, 0, 0, {ACT_ABORTHUP} },
312 {EV_TIMEOUT, 401, 403, -1, 0, 0, {ACT_ABORTHUP} },
313
314 {EV_BC_CLOSED, 0, 0, -1, 0, -1, {ACT_NOTIFY_BC_DOWN} },
315
316 /* ring */
317 {RSP_ZBC, 700, 700, -1, -1, -1, {0} },
318 {RSP_ZHLC, 700, 700, -1, -1, -1, {0} },
319 {RSP_NMBR, 700, 700, -1, -1, -1, {0} },
320 {RSP_ZCPN, 700, 700, -1, -1, -1, {0} },
321 {RSP_ZCTP, 700, 700, -1, -1, -1, {0} },
322 {EV_TIMEOUT, 700, 700, -1, 720, 720, {ACT_ICALL} },
323 {EV_BC_CLOSED, 720, 720, -1, 0, -1, {ACT_NOTIFY_BC_DOWN} },
324
325 /*accept icall*/
326 {EV_ACCEPT, -1, -1, -1, -1, -1, {ACT_ACCEPT} },
327 {RSP_INIT, 720, 720, SEQ_ACCEPT, 721, 5, {ACT_CMD + AT_PROTO} },
328 {RSP_OK, 721, 721, -1, 722, 5, {ACT_CMD + AT_ISO} },
329 {RSP_OK, 722, 722, -1, 723, 5, {0}, "+VLS=17\r"},
330 {RSP_OK, 723, 723, -1, 724, 5, {0} },
331 {RSP_ZVLS, 724, 724, 17, 750, 50, {ACT_ACCEPTED} },
332 {RSP_ERROR, 721, 729, -1, 0, 0, {ACT_ABORTACCEPT} },
333 {EV_TIMEOUT, 721, 729, -1, 0, 0, {ACT_ABORTACCEPT} },
334 {RSP_ZSAU, 700, 729, ZSAU_NULL, 0, 0, {ACT_ABORTACCEPT} },
335 {RSP_ZSAU, 700, 729, ZSAU_ACTIVE, 0, 0, {ACT_ABORTACCEPT} },
336 {RSP_ZSAU, 700, 729, ZSAU_DISCONNECT_IND, 0, 0, {ACT_ABORTACCEPT} },
337
338 {EV_BC_OPEN, 750, 750, -1, 751, -1},
339 {EV_TIMEOUT, 750, 751, -1, 0, 0, {ACT_CONNTIMEOUT} },
340
341 /* B channel closed (general case) */
342 {EV_BC_CLOSED, -1, -1, -1, -1, -1, {ACT_NOTIFY_BC_DOWN} },
343
344 /* misc. */
345 {RSP_ZCON, -1, -1, -1, -1, -1, {ACT_DEBUG} },
346 {RSP_ZCAU, -1, -1, -1, -1, -1, {ACT_ZCAU} },
347 {RSP_NONE, -1, -1, -1, -1, -1, {ACT_DEBUG} },
348 {RSP_ANY, -1, -1, -1, -1, -1, {ACT_WARN} },
349 {RSP_LAST}
350 };
351
352
353 static const struct resp_type_t {
354 char *response;
355 int resp_code;
356 int type;
357 }
358 resp_type[] =
359 {
360 {"OK", RSP_OK, RT_NOTHING},
361 {"ERROR", RSP_ERROR, RT_NOTHING},
362 {"ZSAU", RSP_ZSAU, RT_ZSAU},
363 {"ZCAU", RSP_ZCAU, RT_ZCAU},
364 {"RING", RSP_RING, RT_RING},
365 {"ZGCI", RSP_ZGCI, RT_NUMBER},
366 {"ZVLS", RSP_ZVLS, RT_NUMBER},
367 {"ZCTP", RSP_ZCTP, RT_NUMBER},
368 {"ZDLE", RSP_ZDLE, RT_NUMBER},
369 {"ZHLC", RSP_ZHLC, RT_STRING},
370 {"ZBC", RSP_ZBC, RT_STRING},
371 {"NMBR", RSP_NMBR, RT_STRING},
372 {"ZCPN", RSP_ZCPN, RT_STRING},
373 {"ZCON", RSP_ZCON, RT_STRING},
374 {NULL, 0, 0}
375 };
376
377 static const struct zsau_resp_t {
378 char *str;
379 int code;
380 }
381 zsau_resp[] =
382 {
383 {"OUTGOING_CALL_PROCEEDING", ZSAU_PROCEEDING},
384 {"CALL_DELIVERED", ZSAU_CALL_DELIVERED},
385 {"ACTIVE", ZSAU_ACTIVE},
386 {"DISCONNECT_IND", ZSAU_DISCONNECT_IND},
387 {"NULL", ZSAU_NULL},
388 {"DISCONNECT_REQ", ZSAU_DISCONNECT_REQ},
389 {NULL, ZSAU_UNKNOWN}
390 };
391
392 /* check for and remove fixed string prefix
393 * If s starts with prefix terminated by a non-alphanumeric character,
394 * return pointer to the first character after that, otherwise return NULL.
395 */
396 static char *skip_prefix(char *s, const char *prefix)
397 {
398 while (*prefix)
399 if (*s++ != *prefix++)
400 return NULL;
401 if (isalnum(*s))
402 return NULL;
403 return s;
404 }
405
406 /* queue event with CID */
407 static void add_cid_event(struct cardstate *cs, int cid, int type,
408 void *ptr, int parameter)
409 {
410 unsigned long flags;
411 unsigned next, tail;
412 struct event_t *event;
413
414 gig_dbg(DEBUG_EVENT, "queueing event %d for cid %d", type, cid);
415
416 spin_lock_irqsave(&cs->ev_lock, flags);
417
418 tail = cs->ev_tail;
419 next = (tail + 1) % MAX_EVENTS;
420 if (unlikely(next == cs->ev_head)) {
421 dev_err(cs->dev, "event queue full\n");
422 kfree(ptr);
423 } else {
424 event = cs->events + tail;
425 event->type = type;
426 event->cid = cid;
427 event->ptr = ptr;
428 event->arg = NULL;
429 event->parameter = parameter;
430 event->at_state = NULL;
431 cs->ev_tail = next;
432 }
433
434 spin_unlock_irqrestore(&cs->ev_lock, flags);
435 }
436
437 /**
438 * gigaset_handle_modem_response() - process received modem response
439 * @cs: device descriptor structure.
440 *
441 * Called by asyncdata/isocdata if a block of data received from the
442 * device must be processed as a modem command response. The data is
443 * already in the cs structure.
444 */
445 void gigaset_handle_modem_response(struct cardstate *cs)
446 {
447 char *eoc, *psep, *ptr;
448 const struct resp_type_t *rt;
449 const struct zsau_resp_t *zr;
450 int cid, parameter;
451 u8 type, value;
452
453 if (!cs->cbytes) {
454 /* ignore additional LFs/CRs (M10x config mode or cx100) */
455 gig_dbg(DEBUG_MCMD, "skipped EOL [%02X]", cs->respdata[0]);
456 return;
457 }
458 cs->respdata[cs->cbytes] = 0;
459
460 if (cs->at_state.getstring) {
461 /* state machine wants next line verbatim */
462 cs->at_state.getstring = 0;
463 ptr = kstrdup(cs->respdata, GFP_ATOMIC);
464 gig_dbg(DEBUG_EVENT, "string==%s", ptr ? ptr : "NULL");
465 add_cid_event(cs, 0, RSP_STRING, ptr, 0);
466 return;
467 }
468
469 /* look up response type */
470 for (rt = resp_type; rt->response; ++rt) {
471 eoc = skip_prefix(cs->respdata, rt->response);
472 if (eoc)
473 break;
474 }
475 if (!rt->response) {
476 add_cid_event(cs, 0, RSP_NONE, NULL, 0);
477 gig_dbg(DEBUG_EVENT, "unknown modem response: '%s'\n",
478 cs->respdata);
479 return;
480 }
481
482 /* check for CID */
483 psep = strrchr(cs->respdata, ';');
484 if (psep &&
485 !kstrtoint(psep + 1, 10, &cid) &&
486 cid >= 1 && cid <= 65535) {
487 /* valid CID: chop it off */
488 *psep = 0;
489 } else {
490 /* no valid CID: leave unchanged */
491 cid = 0;
492 }
493
494 gig_dbg(DEBUG_EVENT, "CMD received: %s", cs->respdata);
495 if (cid)
496 gig_dbg(DEBUG_EVENT, "CID: %d", cid);
497
498 switch (rt->type) {
499 case RT_NOTHING:
500 /* check parameter separator */
501 if (*eoc)
502 goto bad_param; /* extra parameter */
503
504 add_cid_event(cs, cid, rt->resp_code, NULL, 0);
505 break;
506
507 case RT_RING:
508 /* check parameter separator */
509 if (!*eoc)
510 eoc = NULL; /* no parameter */
511 else if (*eoc++ != ',')
512 goto bad_param;
513
514 add_cid_event(cs, 0, rt->resp_code, NULL, cid);
515
516 /* process parameters as individual responses */
517 while (eoc) {
518 /* look up parameter type */
519 psep = NULL;
520 for (rt = resp_type; rt->response; ++rt) {
521 psep = skip_prefix(eoc, rt->response);
522 if (psep)
523 break;
524 }
525
526 /* all legal parameters are of type RT_STRING */
527 if (!psep || rt->type != RT_STRING) {
528 dev_warn(cs->dev,
529 "illegal RING parameter: '%s'\n",
530 eoc);
531 return;
532 }
533
534 /* skip parameter value separator */
535 if (*psep++ != '=')
536 goto bad_param;
537
538 /* look up end of parameter */
539 eoc = strchr(psep, ',');
540 if (eoc)
541 *eoc++ = 0;
542
543 /* retrieve parameter value */
544 ptr = kstrdup(psep, GFP_ATOMIC);
545
546 /* queue event */
547 add_cid_event(cs, cid, rt->resp_code, ptr, 0);
548 }
549 break;
550
551 case RT_ZSAU:
552 /* check parameter separator */
553 if (!*eoc) {
554 /* no parameter */
555 add_cid_event(cs, cid, rt->resp_code, NULL, ZSAU_NONE);
556 break;
557 }
558 if (*eoc++ != '=')
559 goto bad_param;
560
561 /* look up parameter value */
562 for (zr = zsau_resp; zr->str; ++zr)
563 if (!strcmp(eoc, zr->str))
564 break;
565 if (!zr->str)
566 goto bad_param;
567
568 add_cid_event(cs, cid, rt->resp_code, NULL, zr->code);
569 break;
570
571 case RT_STRING:
572 /* check parameter separator */
573 if (*eoc++ != '=')
574 goto bad_param;
575
576 /* retrieve parameter value */
577 ptr = kstrdup(eoc, GFP_ATOMIC);
578
579 /* queue event */
580 add_cid_event(cs, cid, rt->resp_code, ptr, 0);
581 break;
582
583 case RT_ZCAU:
584 /* check parameter separators */
585 if (*eoc++ != '=')
586 goto bad_param;
587 psep = strchr(eoc, ',');
588 if (!psep)
589 goto bad_param;
590 *psep++ = 0;
591
592 /* decode parameter values */
593 if (kstrtou8(eoc, 16, &type) || kstrtou8(psep, 16, &value)) {
594 *--psep = ',';
595 goto bad_param;
596 }
597 parameter = (type << 8) | value;
598
599 add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
600 break;
601
602 case RT_NUMBER:
603 /* check parameter separator */
604 if (*eoc++ != '=')
605 goto bad_param;
606
607 /* decode parameter value */
608 if (kstrtoint(eoc, 10, &parameter))
609 goto bad_param;
610
611 /* special case ZDLE: set flag before queueing event */
612 if (rt->resp_code == RSP_ZDLE)
613 cs->dle = parameter;
614
615 add_cid_event(cs, cid, rt->resp_code, NULL, parameter);
616 break;
617
618 bad_param:
619 /* parameter unexpected, incomplete or malformed */
620 dev_warn(cs->dev, "bad parameter in response '%s'\n",
621 cs->respdata);
622 add_cid_event(cs, cid, rt->resp_code, NULL, -1);
623 break;
624
625 default:
626 dev_err(cs->dev, "%s: internal error on '%s'\n",
627 __func__, cs->respdata);
628 }
629 }
630 EXPORT_SYMBOL_GPL(gigaset_handle_modem_response);
631
632 /* disconnect_nobc
633 * process closing of connection associated with given AT state structure
634 * without B channel
635 */
636 static void disconnect_nobc(struct at_state_t **at_state_p,
637 struct cardstate *cs)
638 {
639 unsigned long flags;
640
641 spin_lock_irqsave(&cs->lock, flags);
642 ++(*at_state_p)->seq_index;
643
644 /* revert to selected idle mode */
645 if (!cs->cidmode) {
646 cs->at_state.pending_commands |= PC_UMMODE;
647 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
648 cs->commands_pending = 1;
649 }
650
651 /* check for and deallocate temporary AT state */
652 if (!list_empty(&(*at_state_p)->list)) {
653 list_del(&(*at_state_p)->list);
654 kfree(*at_state_p);
655 *at_state_p = NULL;
656 }
657
658 spin_unlock_irqrestore(&cs->lock, flags);
659 }
660
661 /* disconnect_bc
662 * process closing of connection associated with given AT state structure
663 * and B channel
664 */
665 static void disconnect_bc(struct at_state_t *at_state,
666 struct cardstate *cs, struct bc_state *bcs)
667 {
668 unsigned long flags;
669
670 spin_lock_irqsave(&cs->lock, flags);
671 ++at_state->seq_index;
672
673 /* revert to selected idle mode */
674 if (!cs->cidmode) {
675 cs->at_state.pending_commands |= PC_UMMODE;
676 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
677 cs->commands_pending = 1;
678 }
679 spin_unlock_irqrestore(&cs->lock, flags);
680
681 /* invoke hardware specific handler */
682 cs->ops->close_bchannel(bcs);
683
684 /* notify LL */
685 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
686 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
687 gigaset_isdn_hupD(bcs);
688 }
689 }
690
691 /* get_free_channel
692 * get a free AT state structure: either one of those associated with the
693 * B channels of the Gigaset device, or if none of those is available,
694 * a newly allocated one with bcs=NULL
695 * The structure should be freed by calling disconnect_nobc() after use.
696 */
697 static inline struct at_state_t *get_free_channel(struct cardstate *cs,
698 int cid)
699 /* cids: >0: siemens-cid
700 * 0: without cid
701 * -1: no cid assigned yet
702 */
703 {
704 unsigned long flags;
705 int i;
706 struct at_state_t *ret;
707
708 for (i = 0; i < cs->channels; ++i)
709 if (gigaset_get_channel(cs->bcs + i) >= 0) {
710 ret = &cs->bcs[i].at_state;
711 ret->cid = cid;
712 return ret;
713 }
714
715 spin_lock_irqsave(&cs->lock, flags);
716 ret = kmalloc(sizeof(struct at_state_t), GFP_ATOMIC);
717 if (ret) {
718 gigaset_at_init(ret, NULL, cs, cid);
719 list_add(&ret->list, &cs->temp_at_states);
720 }
721 spin_unlock_irqrestore(&cs->lock, flags);
722 return ret;
723 }
724
725 static void init_failed(struct cardstate *cs, int mode)
726 {
727 int i;
728 struct at_state_t *at_state;
729
730 cs->at_state.pending_commands &= ~PC_INIT;
731 cs->mode = mode;
732 cs->mstate = MS_UNINITIALIZED;
733 gigaset_free_channels(cs);
734 for (i = 0; i < cs->channels; ++i) {
735 at_state = &cs->bcs[i].at_state;
736 if (at_state->pending_commands & PC_CID) {
737 at_state->pending_commands &= ~PC_CID;
738 at_state->pending_commands |= PC_NOCID;
739 cs->commands_pending = 1;
740 }
741 }
742 }
743
744 static void schedule_init(struct cardstate *cs, int state)
745 {
746 if (cs->at_state.pending_commands & PC_INIT) {
747 gig_dbg(DEBUG_EVENT, "not scheduling PC_INIT again");
748 return;
749 }
750 cs->mstate = state;
751 cs->mode = M_UNKNOWN;
752 gigaset_block_channels(cs);
753 cs->at_state.pending_commands |= PC_INIT;
754 gig_dbg(DEBUG_EVENT, "Scheduling PC_INIT");
755 cs->commands_pending = 1;
756 }
757
758 /* send an AT command
759 * adding the "AT" prefix, cid and DLE encapsulation as appropriate
760 */
761 static void send_command(struct cardstate *cs, const char *cmd,
762 struct at_state_t *at_state)
763 {
764 int cid = at_state->cid;
765 struct cmdbuf_t *cb;
766 size_t buflen;
767
768 buflen = strlen(cmd) + 12; /* DLE ( A T 1 2 3 4 5 <cmd> DLE ) \0 */
769 cb = kmalloc(sizeof(struct cmdbuf_t) + buflen, GFP_ATOMIC);
770 if (!cb) {
771 dev_err(cs->dev, "%s: out of memory\n", __func__);
772 return;
773 }
774 if (cid > 0 && cid <= 65535)
775 cb->len = snprintf(cb->buf, buflen,
776 cs->dle ? "\020(AT%d%s\020)" : "AT%d%s",
777 cid, cmd);
778 else
779 cb->len = snprintf(cb->buf, buflen,
780 cs->dle ? "\020(AT%s\020)" : "AT%s",
781 cmd);
782 cb->offset = 0;
783 cb->next = NULL;
784 cb->wake_tasklet = NULL;
785 cs->ops->write_cmd(cs, cb);
786 }
787
788 static struct at_state_t *at_state_from_cid(struct cardstate *cs, int cid)
789 {
790 struct at_state_t *at_state;
791 int i;
792 unsigned long flags;
793
794 if (cid == 0)
795 return &cs->at_state;
796
797 for (i = 0; i < cs->channels; ++i)
798 if (cid == cs->bcs[i].at_state.cid)
799 return &cs->bcs[i].at_state;
800
801 spin_lock_irqsave(&cs->lock, flags);
802
803 list_for_each_entry(at_state, &cs->temp_at_states, list)
804 if (cid == at_state->cid) {
805 spin_unlock_irqrestore(&cs->lock, flags);
806 return at_state;
807 }
808
809 spin_unlock_irqrestore(&cs->lock, flags);
810
811 return NULL;
812 }
813
814 static void bchannel_down(struct bc_state *bcs)
815 {
816 if (bcs->chstate & CHS_B_UP) {
817 bcs->chstate &= ~CHS_B_UP;
818 gigaset_isdn_hupB(bcs);
819 }
820
821 if (bcs->chstate & (CHS_D_UP | CHS_NOTIFY_LL)) {
822 bcs->chstate &= ~(CHS_D_UP | CHS_NOTIFY_LL);
823 gigaset_isdn_hupD(bcs);
824 }
825
826 gigaset_free_channel(bcs);
827
828 gigaset_bcs_reinit(bcs);
829 }
830
831 static void bchannel_up(struct bc_state *bcs)
832 {
833 if (bcs->chstate & CHS_B_UP) {
834 dev_notice(bcs->cs->dev, "%s: B channel already up\n",
835 __func__);
836 return;
837 }
838
839 bcs->chstate |= CHS_B_UP;
840 gigaset_isdn_connB(bcs);
841 }
842
843 static void start_dial(struct at_state_t *at_state, void *data,
844 unsigned seq_index)
845 {
846 struct bc_state *bcs = at_state->bcs;
847 struct cardstate *cs = at_state->cs;
848 char **commands = data;
849 unsigned long flags;
850 int i;
851
852 bcs->chstate |= CHS_NOTIFY_LL;
853
854 spin_lock_irqsave(&cs->lock, flags);
855 if (at_state->seq_index != seq_index) {
856 spin_unlock_irqrestore(&cs->lock, flags);
857 goto error;
858 }
859 spin_unlock_irqrestore(&cs->lock, flags);
860
861 for (i = 0; i < AT_NUM; ++i) {
862 kfree(bcs->commands[i]);
863 bcs->commands[i] = commands[i];
864 }
865
866 at_state->pending_commands |= PC_CID;
867 gig_dbg(DEBUG_EVENT, "Scheduling PC_CID");
868 cs->commands_pending = 1;
869 return;
870
871 error:
872 for (i = 0; i < AT_NUM; ++i) {
873 kfree(commands[i]);
874 commands[i] = NULL;
875 }
876 at_state->pending_commands |= PC_NOCID;
877 gig_dbg(DEBUG_EVENT, "Scheduling PC_NOCID");
878 cs->commands_pending = 1;
879 return;
880 }
881
882 static void start_accept(struct at_state_t *at_state)
883 {
884 struct cardstate *cs = at_state->cs;
885 struct bc_state *bcs = at_state->bcs;
886 int i;
887
888 for (i = 0; i < AT_NUM; ++i) {
889 kfree(bcs->commands[i]);
890 bcs->commands[i] = NULL;
891 }
892
893 bcs->commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
894 bcs->commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
895 if (!bcs->commands[AT_PROTO] || !bcs->commands[AT_ISO]) {
896 dev_err(at_state->cs->dev, "out of memory\n");
897 /* error reset */
898 at_state->pending_commands |= PC_HUP;
899 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
900 cs->commands_pending = 1;
901 return;
902 }
903
904 snprintf(bcs->commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
905 snprintf(bcs->commands[AT_ISO], 9, "^SISO=%u\r", bcs->channel + 1);
906
907 at_state->pending_commands |= PC_ACCEPT;
908 gig_dbg(DEBUG_EVENT, "Scheduling PC_ACCEPT");
909 cs->commands_pending = 1;
910 }
911
912 static void do_start(struct cardstate *cs)
913 {
914 gigaset_free_channels(cs);
915
916 if (cs->mstate != MS_LOCKED)
917 schedule_init(cs, MS_INIT);
918
919 cs->isdn_up = 1;
920 gigaset_isdn_start(cs);
921
922 cs->waiting = 0;
923 wake_up(&cs->waitqueue);
924 }
925
926 static void finish_shutdown(struct cardstate *cs)
927 {
928 if (cs->mstate != MS_LOCKED) {
929 cs->mstate = MS_UNINITIALIZED;
930 cs->mode = M_UNKNOWN;
931 }
932
933 /* Tell the LL that the device is not available .. */
934 if (cs->isdn_up) {
935 cs->isdn_up = 0;
936 gigaset_isdn_stop(cs);
937 }
938
939 /* The rest is done by cleanup_cs() in process context. */
940
941 cs->cmd_result = -ENODEV;
942 cs->waiting = 0;
943 wake_up(&cs->waitqueue);
944 }
945
946 static void do_shutdown(struct cardstate *cs)
947 {
948 gigaset_block_channels(cs);
949
950 if (cs->mstate == MS_READY) {
951 cs->mstate = MS_SHUTDOWN;
952 cs->at_state.pending_commands |= PC_SHUTDOWN;
953 gig_dbg(DEBUG_EVENT, "Scheduling PC_SHUTDOWN");
954 cs->commands_pending = 1;
955 } else
956 finish_shutdown(cs);
957 }
958
959 static void do_stop(struct cardstate *cs)
960 {
961 unsigned long flags;
962
963 spin_lock_irqsave(&cs->lock, flags);
964 cs->connected = 0;
965 spin_unlock_irqrestore(&cs->lock, flags);
966
967 do_shutdown(cs);
968 }
969
970 /* Entering cid mode or getting a cid failed:
971 * try to initialize the device and try again.
972 *
973 * channel >= 0: getting cid for the channel failed
974 * channel < 0: entering cid mode failed
975 *
976 * returns 0 on success, <0 on failure
977 */
978 static int reinit_and_retry(struct cardstate *cs, int channel)
979 {
980 int i;
981
982 if (--cs->retry_count <= 0)
983 return -EFAULT;
984
985 for (i = 0; i < cs->channels; ++i)
986 if (cs->bcs[i].at_state.cid > 0)
987 return -EBUSY;
988
989 if (channel < 0)
990 dev_warn(cs->dev,
991 "Could not enter cid mode. Reinit device and try again.\n");
992 else {
993 dev_warn(cs->dev,
994 "Could not get a call id. Reinit device and try again.\n");
995 cs->bcs[channel].at_state.pending_commands |= PC_CID;
996 }
997 schedule_init(cs, MS_INIT);
998 return 0;
999 }
1000
1001 static int at_state_invalid(struct cardstate *cs,
1002 struct at_state_t *test_ptr)
1003 {
1004 unsigned long flags;
1005 unsigned channel;
1006 struct at_state_t *at_state;
1007 int retval = 0;
1008
1009 spin_lock_irqsave(&cs->lock, flags);
1010
1011 if (test_ptr == &cs->at_state)
1012 goto exit;
1013
1014 list_for_each_entry(at_state, &cs->temp_at_states, list)
1015 if (at_state == test_ptr)
1016 goto exit;
1017
1018 for (channel = 0; channel < cs->channels; ++channel)
1019 if (&cs->bcs[channel].at_state == test_ptr)
1020 goto exit;
1021
1022 retval = 1;
1023 exit:
1024 spin_unlock_irqrestore(&cs->lock, flags);
1025 return retval;
1026 }
1027
1028 static void handle_icall(struct cardstate *cs, struct bc_state *bcs,
1029 struct at_state_t *at_state)
1030 {
1031 int retval;
1032
1033 retval = gigaset_isdn_icall(at_state);
1034 switch (retval) {
1035 case ICALL_ACCEPT:
1036 break;
1037 default:
1038 dev_err(cs->dev, "internal error: disposition=%d\n", retval);
1039 /* fall through */
1040 case ICALL_IGNORE:
1041 case ICALL_REJECT:
1042 /* hang up actively
1043 * Device doc says that would reject the call.
1044 * In fact it doesn't.
1045 */
1046 at_state->pending_commands |= PC_HUP;
1047 cs->commands_pending = 1;
1048 break;
1049 }
1050 }
1051
1052 static int do_lock(struct cardstate *cs)
1053 {
1054 int mode;
1055 int i;
1056
1057 switch (cs->mstate) {
1058 case MS_UNINITIALIZED:
1059 case MS_READY:
1060 if (cs->cur_at_seq || !list_empty(&cs->temp_at_states) ||
1061 cs->at_state.pending_commands)
1062 return -EBUSY;
1063
1064 for (i = 0; i < cs->channels; ++i)
1065 if (cs->bcs[i].at_state.pending_commands)
1066 return -EBUSY;
1067
1068 if (gigaset_get_channels(cs) < 0)
1069 return -EBUSY;
1070
1071 break;
1072 case MS_LOCKED:
1073 break;
1074 default:
1075 return -EBUSY;
1076 }
1077
1078 mode = cs->mode;
1079 cs->mstate = MS_LOCKED;
1080 cs->mode = M_UNKNOWN;
1081
1082 return mode;
1083 }
1084
1085 static int do_unlock(struct cardstate *cs)
1086 {
1087 if (cs->mstate != MS_LOCKED)
1088 return -EINVAL;
1089
1090 cs->mstate = MS_UNINITIALIZED;
1091 cs->mode = M_UNKNOWN;
1092 gigaset_free_channels(cs);
1093 if (cs->connected)
1094 schedule_init(cs, MS_INIT);
1095
1096 return 0;
1097 }
1098
1099 static void do_action(int action, struct cardstate *cs,
1100 struct bc_state *bcs,
1101 struct at_state_t **p_at_state, char **pp_command,
1102 int *p_genresp, int *p_resp_code,
1103 struct event_t *ev)
1104 {
1105 struct at_state_t *at_state = *p_at_state;
1106 struct bc_state *bcs2;
1107 unsigned long flags;
1108
1109 int channel;
1110
1111 unsigned char *s, *e;
1112 int i;
1113 unsigned long val;
1114
1115 switch (action) {
1116 case ACT_NOTHING:
1117 break;
1118 case ACT_TIMEOUT:
1119 at_state->waiting = 1;
1120 break;
1121 case ACT_INIT:
1122 cs->at_state.pending_commands &= ~PC_INIT;
1123 cs->cur_at_seq = SEQ_NONE;
1124 cs->mode = M_UNIMODEM;
1125 spin_lock_irqsave(&cs->lock, flags);
1126 if (!cs->cidmode) {
1127 spin_unlock_irqrestore(&cs->lock, flags);
1128 gigaset_free_channels(cs);
1129 cs->mstate = MS_READY;
1130 break;
1131 }
1132 spin_unlock_irqrestore(&cs->lock, flags);
1133 cs->at_state.pending_commands |= PC_CIDMODE;
1134 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1135 cs->commands_pending = 1;
1136 break;
1137 case ACT_FAILINIT:
1138 dev_warn(cs->dev, "Could not initialize the device.\n");
1139 cs->dle = 0;
1140 init_failed(cs, M_UNKNOWN);
1141 cs->cur_at_seq = SEQ_NONE;
1142 break;
1143 case ACT_CONFIGMODE:
1144 init_failed(cs, M_CONFIG);
1145 cs->cur_at_seq = SEQ_NONE;
1146 break;
1147 case ACT_SETDLE1:
1148 cs->dle = 1;
1149 /* cs->inbuf[0].inputstate |= INS_command | INS_DLE_command; */
1150 cs->inbuf[0].inputstate &=
1151 ~(INS_command | INS_DLE_command);
1152 break;
1153 case ACT_SETDLE0:
1154 cs->dle = 0;
1155 cs->inbuf[0].inputstate =
1156 (cs->inbuf[0].inputstate & ~INS_DLE_command)
1157 | INS_command;
1158 break;
1159 case ACT_CMODESET:
1160 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1161 gigaset_free_channels(cs);
1162 cs->mstate = MS_READY;
1163 }
1164 cs->mode = M_CID;
1165 cs->cur_at_seq = SEQ_NONE;
1166 break;
1167 case ACT_UMODESET:
1168 cs->mode = M_UNIMODEM;
1169 cs->cur_at_seq = SEQ_NONE;
1170 break;
1171 case ACT_FAILCMODE:
1172 cs->cur_at_seq = SEQ_NONE;
1173 if (cs->mstate == MS_INIT || cs->mstate == MS_RECOVER) {
1174 init_failed(cs, M_UNKNOWN);
1175 break;
1176 }
1177 if (reinit_and_retry(cs, -1) < 0)
1178 schedule_init(cs, MS_RECOVER);
1179 break;
1180 case ACT_FAILUMODE:
1181 cs->cur_at_seq = SEQ_NONE;
1182 schedule_init(cs, MS_RECOVER);
1183 break;
1184 case ACT_HUPMODEM:
1185 /* send "+++" (hangup in unimodem mode) */
1186 if (cs->connected) {
1187 struct cmdbuf_t *cb;
1188
1189 cb = kmalloc(sizeof(struct cmdbuf_t) + 3, GFP_ATOMIC);
1190 if (!cb) {
1191 dev_err(cs->dev, "%s: out of memory\n",
1192 __func__);
1193 return;
1194 }
1195 memcpy(cb->buf, "+++", 3);
1196 cb->len = 3;
1197 cb->offset = 0;
1198 cb->next = NULL;
1199 cb->wake_tasklet = NULL;
1200 cs->ops->write_cmd(cs, cb);
1201 }
1202 break;
1203 case ACT_RING:
1204 /* get fresh AT state structure for new CID */
1205 at_state = get_free_channel(cs, ev->parameter);
1206 if (!at_state) {
1207 dev_warn(cs->dev,
1208 "RING ignored: could not allocate channel structure\n");
1209 break;
1210 }
1211
1212 /* initialize AT state structure
1213 * note that bcs may be NULL if no B channel is free
1214 */
1215 at_state->ConState = 700;
1216 for (i = 0; i < STR_NUM; ++i) {
1217 kfree(at_state->str_var[i]);
1218 at_state->str_var[i] = NULL;
1219 }
1220 at_state->int_var[VAR_ZCTP] = -1;
1221
1222 spin_lock_irqsave(&cs->lock, flags);
1223 at_state->timer_expires = RING_TIMEOUT;
1224 at_state->timer_active = 1;
1225 spin_unlock_irqrestore(&cs->lock, flags);
1226 break;
1227 case ACT_ICALL:
1228 handle_icall(cs, bcs, at_state);
1229 break;
1230 case ACT_FAILSDOWN:
1231 dev_warn(cs->dev, "Could not shut down the device.\n");
1232 /* fall through */
1233 case ACT_FAKESDOWN:
1234 case ACT_SDOWN:
1235 cs->cur_at_seq = SEQ_NONE;
1236 finish_shutdown(cs);
1237 break;
1238 case ACT_CONNECT:
1239 if (cs->onechannel) {
1240 at_state->pending_commands |= PC_DLE1;
1241 cs->commands_pending = 1;
1242 break;
1243 }
1244 bcs->chstate |= CHS_D_UP;
1245 gigaset_isdn_connD(bcs);
1246 cs->ops->init_bchannel(bcs);
1247 break;
1248 case ACT_DLE1:
1249 cs->cur_at_seq = SEQ_NONE;
1250 bcs = cs->bcs + cs->curchannel;
1251
1252 bcs->chstate |= CHS_D_UP;
1253 gigaset_isdn_connD(bcs);
1254 cs->ops->init_bchannel(bcs);
1255 break;
1256 case ACT_FAKEHUP:
1257 at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
1258 /* fall through */
1259 case ACT_DISCONNECT:
1260 cs->cur_at_seq = SEQ_NONE;
1261 at_state->cid = -1;
1262 if (!bcs) {
1263 disconnect_nobc(p_at_state, cs);
1264 } else if (cs->onechannel && cs->dle) {
1265 /* Check for other open channels not needed:
1266 * DLE only used for M10x with one B channel.
1267 */
1268 at_state->pending_commands |= PC_DLE0;
1269 cs->commands_pending = 1;
1270 } else {
1271 disconnect_bc(at_state, cs, bcs);
1272 }
1273 break;
1274 case ACT_FAKEDLE0:
1275 at_state->int_var[VAR_ZDLE] = 0;
1276 cs->dle = 0;
1277 /* fall through */
1278 case ACT_DLE0:
1279 cs->cur_at_seq = SEQ_NONE;
1280 bcs2 = cs->bcs + cs->curchannel;
1281 disconnect_bc(&bcs2->at_state, cs, bcs2);
1282 break;
1283 case ACT_ABORTHUP:
1284 cs->cur_at_seq = SEQ_NONE;
1285 dev_warn(cs->dev, "Could not hang up.\n");
1286 at_state->cid = -1;
1287 if (!bcs)
1288 disconnect_nobc(p_at_state, cs);
1289 else if (cs->onechannel)
1290 at_state->pending_commands |= PC_DLE0;
1291 else
1292 disconnect_bc(at_state, cs, bcs);
1293 schedule_init(cs, MS_RECOVER);
1294 break;
1295 case ACT_FAILDLE0:
1296 cs->cur_at_seq = SEQ_NONE;
1297 dev_warn(cs->dev, "Error leaving DLE mode.\n");
1298 cs->dle = 0;
1299 bcs2 = cs->bcs + cs->curchannel;
1300 disconnect_bc(&bcs2->at_state, cs, bcs2);
1301 schedule_init(cs, MS_RECOVER);
1302 break;
1303 case ACT_FAILDLE1:
1304 cs->cur_at_seq = SEQ_NONE;
1305 dev_warn(cs->dev,
1306 "Could not enter DLE mode. Trying to hang up.\n");
1307 channel = cs->curchannel;
1308 cs->bcs[channel].at_state.pending_commands |= PC_HUP;
1309 cs->commands_pending = 1;
1310 break;
1311
1312 case ACT_CID: /* got cid; start dialing */
1313 cs->cur_at_seq = SEQ_NONE;
1314 channel = cs->curchannel;
1315 if (ev->parameter > 0 && ev->parameter <= 65535) {
1316 cs->bcs[channel].at_state.cid = ev->parameter;
1317 cs->bcs[channel].at_state.pending_commands |=
1318 PC_DIAL;
1319 cs->commands_pending = 1;
1320 break;
1321 }
1322 /* fall through - bad cid */
1323 case ACT_FAILCID:
1324 cs->cur_at_seq = SEQ_NONE;
1325 channel = cs->curchannel;
1326 if (reinit_and_retry(cs, channel) < 0) {
1327 dev_warn(cs->dev,
1328 "Could not get a call ID. Cannot dial.\n");
1329 bcs2 = cs->bcs + channel;
1330 disconnect_bc(&bcs2->at_state, cs, bcs2);
1331 }
1332 break;
1333 case ACT_ABORTCID:
1334 cs->cur_at_seq = SEQ_NONE;
1335 bcs2 = cs->bcs + cs->curchannel;
1336 disconnect_bc(&bcs2->at_state, cs, bcs2);
1337 break;
1338
1339 case ACT_DIALING:
1340 case ACT_ACCEPTED:
1341 cs->cur_at_seq = SEQ_NONE;
1342 break;
1343
1344 case ACT_ABORTACCEPT: /* hangup/error/timeout during ICALL procssng */
1345 if (bcs)
1346 disconnect_bc(at_state, cs, bcs);
1347 else
1348 disconnect_nobc(p_at_state, cs);
1349 break;
1350
1351 case ACT_ABORTDIAL: /* error/timeout during dial preparation */
1352 cs->cur_at_seq = SEQ_NONE;
1353 at_state->pending_commands |= PC_HUP;
1354 cs->commands_pending = 1;
1355 break;
1356
1357 case ACT_REMOTEREJECT: /* DISCONNECT_IND after dialling */
1358 case ACT_CONNTIMEOUT: /* timeout waiting for ZSAU=ACTIVE */
1359 case ACT_REMOTEHUP: /* DISCONNECT_IND with established connection */
1360 at_state->pending_commands |= PC_HUP;
1361 cs->commands_pending = 1;
1362 break;
1363 case ACT_GETSTRING: /* warning: RING, ZDLE, ...
1364 are not handled properly anymore */
1365 at_state->getstring = 1;
1366 break;
1367 case ACT_SETVER:
1368 if (!ev->ptr) {
1369 *p_genresp = 1;
1370 *p_resp_code = RSP_ERROR;
1371 break;
1372 }
1373 s = ev->ptr;
1374
1375 if (!strcmp(s, "OK")) {
1376 /* OK without version string: assume old response */
1377 *p_genresp = 1;
1378 *p_resp_code = RSP_NONE;
1379 break;
1380 }
1381
1382 for (i = 0; i < 4; ++i) {
1383 val = simple_strtoul(s, (char **) &e, 10);
1384 if (val > INT_MAX || e == s)
1385 break;
1386 if (i == 3) {
1387 if (*e)
1388 break;
1389 } else if (*e != '.')
1390 break;
1391 else
1392 s = e + 1;
1393 cs->fwver[i] = val;
1394 }
1395 if (i != 4) {
1396 *p_genresp = 1;
1397 *p_resp_code = RSP_ERROR;
1398 break;
1399 }
1400 cs->gotfwver = 0;
1401 break;
1402 case ACT_GOTVER:
1403 if (cs->gotfwver == 0) {
1404 cs->gotfwver = 1;
1405 gig_dbg(DEBUG_EVENT,
1406 "firmware version %02d.%03d.%02d.%02d",
1407 cs->fwver[0], cs->fwver[1],
1408 cs->fwver[2], cs->fwver[3]);
1409 break;
1410 }
1411 /* fall through */
1412 case ACT_FAILVER:
1413 cs->gotfwver = -1;
1414 dev_err(cs->dev, "could not read firmware version.\n");
1415 break;
1416 case ACT_ERROR:
1417 gig_dbg(DEBUG_ANY, "%s: ERROR response in ConState %d",
1418 __func__, at_state->ConState);
1419 cs->cur_at_seq = SEQ_NONE;
1420 break;
1421 case ACT_DEBUG:
1422 gig_dbg(DEBUG_ANY, "%s: resp_code %d in ConState %d",
1423 __func__, ev->type, at_state->ConState);
1424 break;
1425 case ACT_WARN:
1426 dev_warn(cs->dev, "%s: resp_code %d in ConState %d!\n",
1427 __func__, ev->type, at_state->ConState);
1428 break;
1429 case ACT_ZCAU:
1430 dev_warn(cs->dev, "cause code %04x in connection state %d.\n",
1431 ev->parameter, at_state->ConState);
1432 break;
1433
1434 /* events from the LL */
1435
1436 case ACT_DIAL:
1437 if (!ev->ptr) {
1438 *p_genresp = 1;
1439 *p_resp_code = RSP_ERROR;
1440 break;
1441 }
1442 start_dial(at_state, ev->ptr, ev->parameter);
1443 break;
1444 case ACT_ACCEPT:
1445 start_accept(at_state);
1446 break;
1447 case ACT_HUP:
1448 at_state->pending_commands |= PC_HUP;
1449 gig_dbg(DEBUG_EVENT, "Scheduling PC_HUP");
1450 cs->commands_pending = 1;
1451 break;
1452
1453 /* hotplug events */
1454
1455 case ACT_STOP:
1456 do_stop(cs);
1457 break;
1458 case ACT_START:
1459 do_start(cs);
1460 break;
1461
1462 /* events from the interface */
1463
1464 case ACT_IF_LOCK:
1465 cs->cmd_result = ev->parameter ? do_lock(cs) : do_unlock(cs);
1466 cs->waiting = 0;
1467 wake_up(&cs->waitqueue);
1468 break;
1469 case ACT_IF_VER:
1470 if (ev->parameter != 0)
1471 cs->cmd_result = -EINVAL;
1472 else if (cs->gotfwver != 1) {
1473 cs->cmd_result = -ENOENT;
1474 } else {
1475 memcpy(ev->arg, cs->fwver, sizeof cs->fwver);
1476 cs->cmd_result = 0;
1477 }
1478 cs->waiting = 0;
1479 wake_up(&cs->waitqueue);
1480 break;
1481
1482 /* events from the proc file system */
1483
1484 case ACT_PROC_CIDMODE:
1485 spin_lock_irqsave(&cs->lock, flags);
1486 if (ev->parameter != cs->cidmode) {
1487 cs->cidmode = ev->parameter;
1488 if (ev->parameter) {
1489 cs->at_state.pending_commands |= PC_CIDMODE;
1490 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1491 } else {
1492 cs->at_state.pending_commands |= PC_UMMODE;
1493 gig_dbg(DEBUG_EVENT, "Scheduling PC_UMMODE");
1494 }
1495 cs->commands_pending = 1;
1496 }
1497 spin_unlock_irqrestore(&cs->lock, flags);
1498 cs->waiting = 0;
1499 wake_up(&cs->waitqueue);
1500 break;
1501
1502 /* events from the hardware drivers */
1503
1504 case ACT_NOTIFY_BC_DOWN:
1505 bchannel_down(bcs);
1506 break;
1507 case ACT_NOTIFY_BC_UP:
1508 bchannel_up(bcs);
1509 break;
1510 case ACT_SHUTDOWN:
1511 do_shutdown(cs);
1512 break;
1513
1514
1515 default:
1516 if (action >= ACT_CMD && action < ACT_CMD + AT_NUM) {
1517 *pp_command = at_state->bcs->commands[action - ACT_CMD];
1518 if (!*pp_command) {
1519 *p_genresp = 1;
1520 *p_resp_code = RSP_NULL;
1521 }
1522 } else
1523 dev_err(cs->dev, "%s: action==%d!\n", __func__, action);
1524 }
1525 }
1526
1527 /* State machine to do the calling and hangup procedure */
1528 static void process_event(struct cardstate *cs, struct event_t *ev)
1529 {
1530 struct bc_state *bcs;
1531 char *p_command = NULL;
1532 struct reply_t *rep;
1533 int rcode;
1534 int genresp = 0;
1535 int resp_code = RSP_ERROR;
1536 struct at_state_t *at_state;
1537 int index;
1538 int curact;
1539 unsigned long flags;
1540
1541 if (ev->cid >= 0) {
1542 at_state = at_state_from_cid(cs, ev->cid);
1543 if (!at_state) {
1544 gig_dbg(DEBUG_EVENT, "event %d for invalid cid %d",
1545 ev->type, ev->cid);
1546 gigaset_add_event(cs, &cs->at_state, RSP_WRONG_CID,
1547 NULL, 0, NULL);
1548 return;
1549 }
1550 } else {
1551 at_state = ev->at_state;
1552 if (at_state_invalid(cs, at_state)) {
1553 gig_dbg(DEBUG_EVENT, "event for invalid at_state %p",
1554 at_state);
1555 return;
1556 }
1557 }
1558
1559 gig_dbg(DEBUG_EVENT, "connection state %d, event %d",
1560 at_state->ConState, ev->type);
1561
1562 bcs = at_state->bcs;
1563
1564 /* Setting the pointer to the dial array */
1565 rep = at_state->replystruct;
1566
1567 spin_lock_irqsave(&cs->lock, flags);
1568 if (ev->type == EV_TIMEOUT) {
1569 if (ev->parameter != at_state->timer_index
1570 || !at_state->timer_active) {
1571 ev->type = RSP_NONE; /* old timeout */
1572 gig_dbg(DEBUG_EVENT, "old timeout");
1573 } else {
1574 if (at_state->waiting)
1575 gig_dbg(DEBUG_EVENT, "stopped waiting");
1576 else
1577 gig_dbg(DEBUG_EVENT, "timeout occurred");
1578 }
1579 }
1580 spin_unlock_irqrestore(&cs->lock, flags);
1581
1582 /* if the response belongs to a variable in at_state->int_var[VAR_XXXX]
1583 or at_state->str_var[STR_XXXX], set it */
1584 if (ev->type >= RSP_VAR && ev->type < RSP_VAR + VAR_NUM) {
1585 index = ev->type - RSP_VAR;
1586 at_state->int_var[index] = ev->parameter;
1587 } else if (ev->type >= RSP_STR && ev->type < RSP_STR + STR_NUM) {
1588 index = ev->type - RSP_STR;
1589 kfree(at_state->str_var[index]);
1590 at_state->str_var[index] = ev->ptr;
1591 ev->ptr = NULL; /* prevent process_events() from
1592 deallocating ptr */
1593 }
1594
1595 if (ev->type == EV_TIMEOUT || ev->type == RSP_STRING)
1596 at_state->getstring = 0;
1597
1598 /* Search row in dial array which matches modem response and current
1599 constate */
1600 for (;; rep++) {
1601 rcode = rep->resp_code;
1602 if (rcode == RSP_LAST) {
1603 /* found nothing...*/
1604 dev_warn(cs->dev, "%s: rcode=RSP_LAST: "
1605 "resp_code %d in ConState %d!\n",
1606 __func__, ev->type, at_state->ConState);
1607 return;
1608 }
1609 if ((rcode == RSP_ANY || rcode == ev->type)
1610 && ((int) at_state->ConState >= rep->min_ConState)
1611 && (rep->max_ConState < 0
1612 || (int) at_state->ConState <= rep->max_ConState)
1613 && (rep->parameter < 0 || rep->parameter == ev->parameter))
1614 break;
1615 }
1616
1617 p_command = rep->command;
1618
1619 at_state->waiting = 0;
1620 for (curact = 0; curact < MAXACT; ++curact) {
1621 /* The row tells us what we should do ..
1622 */
1623 do_action(rep->action[curact], cs, bcs, &at_state, &p_command,
1624 &genresp, &resp_code, ev);
1625 if (!at_state)
1626 /* at_state destroyed by disconnect */
1627 return;
1628 }
1629
1630 /* Jump to the next con-state regarding the array */
1631 if (rep->new_ConState >= 0)
1632 at_state->ConState = rep->new_ConState;
1633
1634 if (genresp) {
1635 spin_lock_irqsave(&cs->lock, flags);
1636 at_state->timer_expires = 0;
1637 at_state->timer_active = 0;
1638 spin_unlock_irqrestore(&cs->lock, flags);
1639 gigaset_add_event(cs, at_state, resp_code, NULL, 0, NULL);
1640 } else {
1641 /* Send command to modem if not NULL... */
1642 if (p_command) {
1643 if (cs->connected)
1644 send_command(cs, p_command, at_state);
1645 else
1646 gigaset_add_event(cs, at_state, RSP_NODEV,
1647 NULL, 0, NULL);
1648 }
1649
1650 spin_lock_irqsave(&cs->lock, flags);
1651 if (!rep->timeout) {
1652 at_state->timer_expires = 0;
1653 at_state->timer_active = 0;
1654 } else if (rep->timeout > 0) { /* new timeout */
1655 at_state->timer_expires = rep->timeout * 10;
1656 at_state->timer_active = 1;
1657 ++at_state->timer_index;
1658 }
1659 spin_unlock_irqrestore(&cs->lock, flags);
1660 }
1661 }
1662
1663 static void schedule_sequence(struct cardstate *cs,
1664 struct at_state_t *at_state, int sequence)
1665 {
1666 cs->cur_at_seq = sequence;
1667 gigaset_add_event(cs, at_state, RSP_INIT, NULL, sequence, NULL);
1668 }
1669
1670 static void process_command_flags(struct cardstate *cs)
1671 {
1672 struct at_state_t *at_state = NULL;
1673 struct bc_state *bcs;
1674 int i;
1675 int sequence;
1676 unsigned long flags;
1677
1678 cs->commands_pending = 0;
1679
1680 if (cs->cur_at_seq) {
1681 gig_dbg(DEBUG_EVENT, "not searching scheduled commands: busy");
1682 return;
1683 }
1684
1685 gig_dbg(DEBUG_EVENT, "searching scheduled commands");
1686
1687 sequence = SEQ_NONE;
1688
1689 /* clear pending_commands and hangup channels on shutdown */
1690 if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1691 cs->at_state.pending_commands &= ~PC_CIDMODE;
1692 for (i = 0; i < cs->channels; ++i) {
1693 bcs = cs->bcs + i;
1694 at_state = &bcs->at_state;
1695 at_state->pending_commands &=
1696 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1697 if (at_state->cid > 0)
1698 at_state->pending_commands |= PC_HUP;
1699 if (at_state->pending_commands & PC_CID) {
1700 at_state->pending_commands |= PC_NOCID;
1701 at_state->pending_commands &= ~PC_CID;
1702 }
1703 }
1704 }
1705
1706 /* clear pending_commands and hangup channels on reset */
1707 if (cs->at_state.pending_commands & PC_INIT) {
1708 cs->at_state.pending_commands &= ~PC_CIDMODE;
1709 for (i = 0; i < cs->channels; ++i) {
1710 bcs = cs->bcs + i;
1711 at_state = &bcs->at_state;
1712 at_state->pending_commands &=
1713 ~(PC_DLE1 | PC_ACCEPT | PC_DIAL);
1714 if (at_state->cid > 0)
1715 at_state->pending_commands |= PC_HUP;
1716 if (cs->mstate == MS_RECOVER) {
1717 if (at_state->pending_commands & PC_CID) {
1718 at_state->pending_commands |= PC_NOCID;
1719 at_state->pending_commands &= ~PC_CID;
1720 }
1721 }
1722 }
1723 }
1724
1725 /* only switch back to unimodem mode if no commands are pending and
1726 * no channels are up */
1727 spin_lock_irqsave(&cs->lock, flags);
1728 if (cs->at_state.pending_commands == PC_UMMODE
1729 && !cs->cidmode
1730 && list_empty(&cs->temp_at_states)
1731 && cs->mode == M_CID) {
1732 sequence = SEQ_UMMODE;
1733 at_state = &cs->at_state;
1734 for (i = 0; i < cs->channels; ++i) {
1735 bcs = cs->bcs + i;
1736 if (bcs->at_state.pending_commands ||
1737 bcs->at_state.cid > 0) {
1738 sequence = SEQ_NONE;
1739 break;
1740 }
1741 }
1742 }
1743 spin_unlock_irqrestore(&cs->lock, flags);
1744 cs->at_state.pending_commands &= ~PC_UMMODE;
1745 if (sequence != SEQ_NONE) {
1746 schedule_sequence(cs, at_state, sequence);
1747 return;
1748 }
1749
1750 for (i = 0; i < cs->channels; ++i) {
1751 bcs = cs->bcs + i;
1752 if (bcs->at_state.pending_commands & PC_HUP) {
1753 if (cs->dle) {
1754 cs->curchannel = bcs->channel;
1755 schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1756 return;
1757 }
1758 bcs->at_state.pending_commands &= ~PC_HUP;
1759 if (bcs->at_state.pending_commands & PC_CID) {
1760 /* not yet dialing: PC_NOCID is sufficient */
1761 bcs->at_state.pending_commands |= PC_NOCID;
1762 bcs->at_state.pending_commands &= ~PC_CID;
1763 } else {
1764 schedule_sequence(cs, &bcs->at_state, SEQ_HUP);
1765 return;
1766 }
1767 }
1768 if (bcs->at_state.pending_commands & PC_NOCID) {
1769 bcs->at_state.pending_commands &= ~PC_NOCID;
1770 cs->curchannel = bcs->channel;
1771 schedule_sequence(cs, &cs->at_state, SEQ_NOCID);
1772 return;
1773 } else if (bcs->at_state.pending_commands & PC_DLE0) {
1774 bcs->at_state.pending_commands &= ~PC_DLE0;
1775 cs->curchannel = bcs->channel;
1776 schedule_sequence(cs, &cs->at_state, SEQ_DLE0);
1777 return;
1778 }
1779 }
1780
1781 list_for_each_entry(at_state, &cs->temp_at_states, list)
1782 if (at_state->pending_commands & PC_HUP) {
1783 at_state->pending_commands &= ~PC_HUP;
1784 schedule_sequence(cs, at_state, SEQ_HUP);
1785 return;
1786 }
1787
1788 if (cs->at_state.pending_commands & PC_INIT) {
1789 cs->at_state.pending_commands &= ~PC_INIT;
1790 cs->dle = 0;
1791 cs->inbuf->inputstate = INS_command;
1792 schedule_sequence(cs, &cs->at_state, SEQ_INIT);
1793 return;
1794 }
1795 if (cs->at_state.pending_commands & PC_SHUTDOWN) {
1796 cs->at_state.pending_commands &= ~PC_SHUTDOWN;
1797 schedule_sequence(cs, &cs->at_state, SEQ_SHUTDOWN);
1798 return;
1799 }
1800 if (cs->at_state.pending_commands & PC_CIDMODE) {
1801 cs->at_state.pending_commands &= ~PC_CIDMODE;
1802 if (cs->mode == M_UNIMODEM) {
1803 cs->retry_count = 1;
1804 schedule_sequence(cs, &cs->at_state, SEQ_CIDMODE);
1805 return;
1806 }
1807 }
1808
1809 for (i = 0; i < cs->channels; ++i) {
1810 bcs = cs->bcs + i;
1811 if (bcs->at_state.pending_commands & PC_DLE1) {
1812 bcs->at_state.pending_commands &= ~PC_DLE1;
1813 cs->curchannel = bcs->channel;
1814 schedule_sequence(cs, &cs->at_state, SEQ_DLE1);
1815 return;
1816 }
1817 if (bcs->at_state.pending_commands & PC_ACCEPT) {
1818 bcs->at_state.pending_commands &= ~PC_ACCEPT;
1819 schedule_sequence(cs, &bcs->at_state, SEQ_ACCEPT);
1820 return;
1821 }
1822 if (bcs->at_state.pending_commands & PC_DIAL) {
1823 bcs->at_state.pending_commands &= ~PC_DIAL;
1824 schedule_sequence(cs, &bcs->at_state, SEQ_DIAL);
1825 return;
1826 }
1827 if (bcs->at_state.pending_commands & PC_CID) {
1828 switch (cs->mode) {
1829 case M_UNIMODEM:
1830 cs->at_state.pending_commands |= PC_CIDMODE;
1831 gig_dbg(DEBUG_EVENT, "Scheduling PC_CIDMODE");
1832 cs->commands_pending = 1;
1833 return;
1834 case M_UNKNOWN:
1835 schedule_init(cs, MS_INIT);
1836 return;
1837 }
1838 bcs->at_state.pending_commands &= ~PC_CID;
1839 cs->curchannel = bcs->channel;
1840 cs->retry_count = 2;
1841 schedule_sequence(cs, &cs->at_state, SEQ_CID);
1842 return;
1843 }
1844 }
1845 }
1846
1847 static void process_events(struct cardstate *cs)
1848 {
1849 struct event_t *ev;
1850 unsigned head, tail;
1851 int i;
1852 int check_flags = 0;
1853 int was_busy;
1854 unsigned long flags;
1855
1856 spin_lock_irqsave(&cs->ev_lock, flags);
1857 head = cs->ev_head;
1858
1859 for (i = 0; i < 2 * MAX_EVENTS; ++i) {
1860 tail = cs->ev_tail;
1861 if (tail == head) {
1862 if (!check_flags && !cs->commands_pending)
1863 break;
1864 check_flags = 0;
1865 spin_unlock_irqrestore(&cs->ev_lock, flags);
1866 process_command_flags(cs);
1867 spin_lock_irqsave(&cs->ev_lock, flags);
1868 tail = cs->ev_tail;
1869 if (tail == head) {
1870 if (!cs->commands_pending)
1871 break;
1872 continue;
1873 }
1874 }
1875
1876 ev = cs->events + head;
1877 was_busy = cs->cur_at_seq != SEQ_NONE;
1878 spin_unlock_irqrestore(&cs->ev_lock, flags);
1879 process_event(cs, ev);
1880 spin_lock_irqsave(&cs->ev_lock, flags);
1881 kfree(ev->ptr);
1882 ev->ptr = NULL;
1883 if (was_busy && cs->cur_at_seq == SEQ_NONE)
1884 check_flags = 1;
1885
1886 head = (head + 1) % MAX_EVENTS;
1887 cs->ev_head = head;
1888 }
1889
1890 spin_unlock_irqrestore(&cs->ev_lock, flags);
1891
1892 if (i == 2 * MAX_EVENTS) {
1893 dev_err(cs->dev,
1894 "infinite loop in process_events; aborting.\n");
1895 }
1896 }
1897
1898 /* tasklet scheduled on any event received from the Gigaset device
1899 * parameter:
1900 * data ISDN controller state structure
1901 */
1902 void gigaset_handle_event(unsigned long data)
1903 {
1904 struct cardstate *cs = (struct cardstate *) data;
1905
1906 /* handle incoming data on control/common channel */
1907 if (cs->inbuf->head != cs->inbuf->tail) {
1908 gig_dbg(DEBUG_INTR, "processing new data");
1909 cs->ops->handle_input(cs->inbuf);
1910 }
1911
1912 process_events(cs);
1913 }
Linux with added FPC-III support