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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
6fd5ea63 HL |
2 | /* |
3 | * Stuff used by all variants of the driver | |
4 | * | |
70440cf2 | 5 | * Copyright (c) 2001 by Stefan Eilers, |
6fd5ea63 HL |
6 | * Hansjoerg Lipp <hjlipp@web.de>, |
7 | * Tilman Schmidt <tilman@imap.cc>. | |
8 | * | |
9 | * ===================================================================== | |
6fd5ea63 | 10 | * ===================================================================== |
6fd5ea63 HL |
11 | */ |
12 | ||
13 | #include "gigaset.h" | |
6fd5ea63 HL |
14 | #include <linux/module.h> |
15 | #include <linux/moduleparam.h> | |
16 | ||
17 | /* Version Information */ | |
70440cf2 | 18 | #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers" |
6fd5ea63 HL |
19 | #define DRIVER_DESC "Driver for Gigaset 307x" |
20 | ||
2038724c TS |
21 | #ifdef CONFIG_GIGASET_DEBUG |
22 | #define DRIVER_DESC_DEBUG " (debug build)" | |
23 | #else | |
24 | #define DRIVER_DESC_DEBUG "" | |
25 | #endif | |
26 | ||
6fd5ea63 | 27 | /* Module parameters */ |
073886ff | 28 | int gigaset_debuglevel; |
6fd5ea63 | 29 | EXPORT_SYMBOL_GPL(gigaset_debuglevel); |
475be4d8 | 30 | module_param_named(debug, gigaset_debuglevel, int, S_IRUGO | S_IWUSR); |
6fd5ea63 HL |
31 | MODULE_PARM_DESC(debug, "debug level"); |
32 | ||
70440cf2 | 33 | /* driver state flags */ |
784d5858 TS |
34 | #define VALID_MINOR 0x01 |
35 | #define VALID_ID 0x02 | |
6fd5ea63 | 36 | |
1cec9727 TS |
37 | /** |
38 | * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging | |
39 | * @level: debugging level. | |
40 | * @msg: message prefix. | |
41 | * @len: number of bytes to dump. | |
42 | * @buf: data to dump. | |
43 | * | |
44 | * If the current debugging level includes one of the bits set in @level, | |
45 | * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio, | |
46 | * prefixed by the text @msg. | |
47 | */ | |
6fd5ea63 | 48 | void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg, |
01371500 | 49 | size_t len, const unsigned char *buf) |
6fd5ea63 HL |
50 | { |
51 | unsigned char outbuf[80]; | |
784d5858 | 52 | unsigned char c; |
6fd5ea63 HL |
53 | size_t space = sizeof outbuf - 1; |
54 | unsigned char *out = outbuf; | |
01371500 | 55 | size_t numin = len; |
6fd5ea63 | 56 | |
01371500 | 57 | while (numin--) { |
784d5858 TS |
58 | c = *buf++; |
59 | if (c == '~' || c == '^' || c == '\\') { | |
01371500 | 60 | if (!space--) |
784d5858 TS |
61 | break; |
62 | *out++ = '\\'; | |
63 | } | |
64 | if (c & 0x80) { | |
01371500 | 65 | if (!space--) |
784d5858 TS |
66 | break; |
67 | *out++ = '~'; | |
68 | c ^= 0x80; | |
69 | } | |
70 | if (c < 0x20 || c == 0x7f) { | |
01371500 | 71 | if (!space--) |
784d5858 | 72 | break; |
6fd5ea63 | 73 | *out++ = '^'; |
784d5858 | 74 | c ^= 0x40; |
6fd5ea63 | 75 | } |
01371500 | 76 | if (!space--) |
784d5858 TS |
77 | break; |
78 | *out++ = c; | |
6fd5ea63 HL |
79 | } |
80 | *out = 0; | |
81 | ||
784d5858 | 82 | gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf); |
6fd5ea63 HL |
83 | } |
84 | EXPORT_SYMBOL_GPL(gigaset_dbg_buffer); | |
85 | ||
86 | static int setflags(struct cardstate *cs, unsigned flags, unsigned delay) | |
87 | { | |
88 | int r; | |
89 | ||
90 | r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags); | |
91 | cs->control_state = flags; | |
92 | if (r < 0) | |
93 | return r; | |
94 | ||
95 | if (delay) { | |
96 | set_current_state(TASK_INTERRUPTIBLE); | |
97 | schedule_timeout(delay * HZ / 1000); | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | int gigaset_enterconfigmode(struct cardstate *cs) | |
104 | { | |
105 | int i, r; | |
106 | ||
d9ba9c91 | 107 | cs->control_state = TIOCM_RTS; |
6fd5ea63 HL |
108 | |
109 | r = setflags(cs, TIOCM_DTR, 200); | |
110 | if (r < 0) | |
111 | goto error; | |
112 | r = setflags(cs, 0, 200); | |
113 | if (r < 0) | |
114 | goto error; | |
115 | for (i = 0; i < 5; ++i) { | |
116 | r = setflags(cs, TIOCM_RTS, 100); | |
117 | if (r < 0) | |
118 | goto error; | |
119 | r = setflags(cs, 0, 100); | |
120 | if (r < 0) | |
121 | goto error; | |
122 | } | |
475be4d8 | 123 | r = setflags(cs, TIOCM_RTS | TIOCM_DTR, 800); |
6fd5ea63 HL |
124 | if (r < 0) |
125 | goto error; | |
126 | ||
127 | return 0; | |
128 | ||
129 | error: | |
784d5858 | 130 | dev_err(cs->dev, "error %d on setuartbits\n", -r); |
475be4d8 JP |
131 | cs->control_state = TIOCM_RTS | TIOCM_DTR; |
132 | cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS | TIOCM_DTR); | |
6fd5ea63 | 133 | |
d9ba9c91 | 134 | return -1; |
6fd5ea63 HL |
135 | } |
136 | ||
137 | static int test_timeout(struct at_state_t *at_state) | |
138 | { | |
139 | if (!at_state->timer_expires) | |
140 | return 0; | |
141 | ||
142 | if (--at_state->timer_expires) { | |
784d5858 TS |
143 | gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu", |
144 | at_state, at_state->timer_expires); | |
6fd5ea63 HL |
145 | return 0; |
146 | } | |
147 | ||
1528b18f TS |
148 | gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL, |
149 | at_state->timer_index, NULL); | |
6fd5ea63 HL |
150 | return 1; |
151 | } | |
152 | ||
4cfea08e | 153 | static void timer_tick(struct timer_list *t) |
6fd5ea63 | 154 | { |
4cfea08e | 155 | struct cardstate *cs = from_timer(cs, t, timer); |
6fd5ea63 HL |
156 | unsigned long flags; |
157 | unsigned channel; | |
158 | struct at_state_t *at_state; | |
159 | int timeout = 0; | |
160 | ||
161 | spin_lock_irqsave(&cs->lock, flags); | |
162 | ||
163 | for (channel = 0; channel < cs->channels; ++channel) | |
164 | if (test_timeout(&cs->bcs[channel].at_state)) | |
165 | timeout = 1; | |
166 | ||
167 | if (test_timeout(&cs->at_state)) | |
168 | timeout = 1; | |
169 | ||
170 | list_for_each_entry(at_state, &cs->temp_at_states, list) | |
171 | if (test_timeout(at_state)) | |
172 | timeout = 1; | |
173 | ||
69049cc8 | 174 | if (cs->running) { |
ec81b5e6 | 175 | mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK)); |
6fd5ea63 | 176 | if (timeout) { |
1528b18f | 177 | gig_dbg(DEBUG_EVENT, "scheduling timeout"); |
6fd5ea63 HL |
178 | tasklet_schedule(&cs->event_tasklet); |
179 | } | |
180 | } | |
181 | ||
182 | spin_unlock_irqrestore(&cs->lock, flags); | |
183 | } | |
184 | ||
185 | int gigaset_get_channel(struct bc_state *bcs) | |
186 | { | |
187 | unsigned long flags; | |
188 | ||
189 | spin_lock_irqsave(&bcs->cs->lock, flags); | |
e468c048 | 190 | if (bcs->use_count || !try_module_get(bcs->cs->driver->owner)) { |
1528b18f | 191 | gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d", |
784d5858 | 192 | bcs->channel); |
6fd5ea63 | 193 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
81fa7b82 | 194 | return -EBUSY; |
6fd5ea63 HL |
195 | } |
196 | ++bcs->use_count; | |
197 | bcs->busy = 1; | |
1528b18f | 198 | gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel); |
6fd5ea63 | 199 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
81fa7b82 | 200 | return 0; |
6fd5ea63 HL |
201 | } |
202 | ||
7bb5fdc2 TS |
203 | struct bc_state *gigaset_get_free_channel(struct cardstate *cs) |
204 | { | |
205 | unsigned long flags; | |
206 | int i; | |
207 | ||
208 | spin_lock_irqsave(&cs->lock, flags); | |
209 | if (!try_module_get(cs->driver->owner)) { | |
1528b18f | 210 | gig_dbg(DEBUG_CHANNEL, |
7bb5fdc2 TS |
211 | "could not get module for allocating channel"); |
212 | spin_unlock_irqrestore(&cs->lock, flags); | |
213 | return NULL; | |
214 | } | |
215 | for (i = 0; i < cs->channels; ++i) | |
216 | if (!cs->bcs[i].use_count) { | |
217 | ++cs->bcs[i].use_count; | |
218 | cs->bcs[i].busy = 1; | |
219 | spin_unlock_irqrestore(&cs->lock, flags); | |
1528b18f | 220 | gig_dbg(DEBUG_CHANNEL, "allocated channel %d", i); |
7bb5fdc2 TS |
221 | return cs->bcs + i; |
222 | } | |
223 | module_put(cs->driver->owner); | |
224 | spin_unlock_irqrestore(&cs->lock, flags); | |
1528b18f | 225 | gig_dbg(DEBUG_CHANNEL, "no free channel"); |
7bb5fdc2 TS |
226 | return NULL; |
227 | } | |
228 | ||
6fd5ea63 HL |
229 | void gigaset_free_channel(struct bc_state *bcs) |
230 | { | |
231 | unsigned long flags; | |
232 | ||
233 | spin_lock_irqsave(&bcs->cs->lock, flags); | |
234 | if (!bcs->busy) { | |
1528b18f TS |
235 | gig_dbg(DEBUG_CHANNEL, "could not free channel %d", |
236 | bcs->channel); | |
6fd5ea63 HL |
237 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
238 | return; | |
239 | } | |
240 | --bcs->use_count; | |
241 | bcs->busy = 0; | |
e468c048 | 242 | module_put(bcs->cs->driver->owner); |
1528b18f | 243 | gig_dbg(DEBUG_CHANNEL, "freed channel %d", bcs->channel); |
6fd5ea63 HL |
244 | spin_unlock_irqrestore(&bcs->cs->lock, flags); |
245 | } | |
246 | ||
247 | int gigaset_get_channels(struct cardstate *cs) | |
248 | { | |
249 | unsigned long flags; | |
250 | int i; | |
251 | ||
252 | spin_lock_irqsave(&cs->lock, flags); | |
253 | for (i = 0; i < cs->channels; ++i) | |
254 | if (cs->bcs[i].use_count) { | |
255 | spin_unlock_irqrestore(&cs->lock, flags); | |
1528b18f TS |
256 | gig_dbg(DEBUG_CHANNEL, |
257 | "could not allocate all channels"); | |
81fa7b82 | 258 | return -EBUSY; |
6fd5ea63 HL |
259 | } |
260 | for (i = 0; i < cs->channels; ++i) | |
261 | ++cs->bcs[i].use_count; | |
262 | spin_unlock_irqrestore(&cs->lock, flags); | |
263 | ||
1528b18f | 264 | gig_dbg(DEBUG_CHANNEL, "allocated all channels"); |
6fd5ea63 | 265 | |
81fa7b82 | 266 | return 0; |
6fd5ea63 HL |
267 | } |
268 | ||
269 | void gigaset_free_channels(struct cardstate *cs) | |
270 | { | |
271 | unsigned long flags; | |
272 | int i; | |
273 | ||
1528b18f | 274 | gig_dbg(DEBUG_CHANNEL, "unblocking all channels"); |
6fd5ea63 HL |
275 | spin_lock_irqsave(&cs->lock, flags); |
276 | for (i = 0; i < cs->channels; ++i) | |
277 | --cs->bcs[i].use_count; | |
278 | spin_unlock_irqrestore(&cs->lock, flags); | |
279 | } | |
280 | ||
281 | void gigaset_block_channels(struct cardstate *cs) | |
282 | { | |
283 | unsigned long flags; | |
284 | int i; | |
285 | ||
1528b18f | 286 | gig_dbg(DEBUG_CHANNEL, "blocking all channels"); |
6fd5ea63 HL |
287 | spin_lock_irqsave(&cs->lock, flags); |
288 | for (i = 0; i < cs->channels; ++i) | |
289 | ++cs->bcs[i].use_count; | |
290 | spin_unlock_irqrestore(&cs->lock, flags); | |
291 | } | |
292 | ||
293 | static void clear_events(struct cardstate *cs) | |
294 | { | |
295 | struct event_t *ev; | |
296 | unsigned head, tail; | |
69049cc8 | 297 | unsigned long flags; |
6fd5ea63 | 298 | |
69049cc8 | 299 | spin_lock_irqsave(&cs->ev_lock, flags); |
6fd5ea63 | 300 | |
69049cc8 TS |
301 | head = cs->ev_head; |
302 | tail = cs->ev_tail; | |
6fd5ea63 HL |
303 | |
304 | while (tail != head) { | |
305 | ev = cs->events + head; | |
306 | kfree(ev->ptr); | |
6fd5ea63 HL |
307 | head = (head + 1) % MAX_EVENTS; |
308 | } | |
309 | ||
69049cc8 TS |
310 | cs->ev_head = tail; |
311 | ||
312 | spin_unlock_irqrestore(&cs->ev_lock, flags); | |
6fd5ea63 HL |
313 | } |
314 | ||
1cec9727 TS |
315 | /** |
316 | * gigaset_add_event() - add event to device event queue | |
317 | * @cs: device descriptor structure. | |
318 | * @at_state: connection state structure. | |
319 | * @type: event type. | |
320 | * @ptr: pointer parameter for event. | |
321 | * @parameter: integer parameter for event. | |
322 | * @arg: pointer parameter for event. | |
323 | * | |
324 | * Allocate an event queue entry from the device's event queue, and set it up | |
325 | * with the parameters given. | |
326 | * | |
327 | * Return value: added event | |
328 | */ | |
6fd5ea63 | 329 | struct event_t *gigaset_add_event(struct cardstate *cs, |
784d5858 TS |
330 | struct at_state_t *at_state, int type, |
331 | void *ptr, int parameter, void *arg) | |
6fd5ea63 HL |
332 | { |
333 | unsigned long flags; | |
334 | unsigned next, tail; | |
335 | struct event_t *event = NULL; | |
336 | ||
1528b18f TS |
337 | gig_dbg(DEBUG_EVENT, "queueing event %d", type); |
338 | ||
6fd5ea63 HL |
339 | spin_lock_irqsave(&cs->ev_lock, flags); |
340 | ||
69049cc8 | 341 | tail = cs->ev_tail; |
6fd5ea63 | 342 | next = (tail + 1) % MAX_EVENTS; |
69049cc8 | 343 | if (unlikely(next == cs->ev_head)) |
5002779d | 344 | dev_err(cs->dev, "event queue full\n"); |
6fd5ea63 HL |
345 | else { |
346 | event = cs->events + tail; | |
347 | event->type = type; | |
348 | event->at_state = at_state; | |
349 | event->cid = -1; | |
350 | event->ptr = ptr; | |
351 | event->arg = arg; | |
352 | event->parameter = parameter; | |
69049cc8 | 353 | cs->ev_tail = next; |
6fd5ea63 HL |
354 | } |
355 | ||
356 | spin_unlock_irqrestore(&cs->ev_lock, flags); | |
357 | ||
358 | return event; | |
359 | } | |
360 | EXPORT_SYMBOL_GPL(gigaset_add_event); | |
361 | ||
7643ffbd | 362 | static void clear_at_state(struct at_state_t *at_state) |
6fd5ea63 HL |
363 | { |
364 | int i; | |
365 | ||
366 | for (i = 0; i < STR_NUM; ++i) { | |
367 | kfree(at_state->str_var[i]); | |
368 | at_state->str_var[i] = NULL; | |
369 | } | |
370 | } | |
371 | ||
7643ffbd | 372 | static void dealloc_temp_at_states(struct cardstate *cs) |
6fd5ea63 HL |
373 | { |
374 | struct at_state_t *cur, *next; | |
375 | ||
376 | list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) { | |
377 | list_del(&cur->list); | |
7643ffbd | 378 | clear_at_state(cur); |
6fd5ea63 HL |
379 | kfree(cur); |
380 | } | |
381 | } | |
382 | ||
383 | static void gigaset_freebcs(struct bc_state *bcs) | |
384 | { | |
385 | int i; | |
386 | ||
784d5858 | 387 | gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel); |
81fa7b82 | 388 | bcs->cs->ops->freebcshw(bcs); |
6fd5ea63 | 389 | |
784d5858 | 390 | gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel); |
6fd5ea63 | 391 | clear_at_state(&bcs->at_state); |
784d5858 | 392 | gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel); |
e7752ee2 TS |
393 | dev_kfree_skb(bcs->rx_skb); |
394 | bcs->rx_skb = NULL; | |
6fd5ea63 | 395 | |
6fd5ea63 HL |
396 | for (i = 0; i < AT_NUM; ++i) { |
397 | kfree(bcs->commands[i]); | |
398 | bcs->commands[i] = NULL; | |
399 | } | |
400 | } | |
401 | ||
70440cf2 TS |
402 | static struct cardstate *alloc_cs(struct gigaset_driver *drv) |
403 | { | |
404 | unsigned long flags; | |
405 | unsigned i; | |
e468c048 | 406 | struct cardstate *cs; |
e702ff0b | 407 | struct cardstate *ret = NULL; |
70440cf2 TS |
408 | |
409 | spin_lock_irqsave(&drv->lock, flags); | |
e468c048 TS |
410 | if (drv->blocked) |
411 | goto exit; | |
70440cf2 | 412 | for (i = 0; i < drv->minors; ++i) { |
e468c048 TS |
413 | cs = drv->cs + i; |
414 | if (!(cs->flags & VALID_MINOR)) { | |
415 | cs->flags = VALID_MINOR; | |
416 | ret = cs; | |
70440cf2 | 417 | break; |
e702ff0b | 418 | } |
70440cf2 | 419 | } |
e468c048 | 420 | exit: |
70440cf2 TS |
421 | spin_unlock_irqrestore(&drv->lock, flags); |
422 | return ret; | |
423 | } | |
424 | ||
425 | static void free_cs(struct cardstate *cs) | |
426 | { | |
e468c048 | 427 | cs->flags = 0; |
70440cf2 TS |
428 | } |
429 | ||
430 | static void make_valid(struct cardstate *cs, unsigned mask) | |
431 | { | |
432 | unsigned long flags; | |
433 | struct gigaset_driver *drv = cs->driver; | |
434 | spin_lock_irqsave(&drv->lock, flags); | |
e468c048 | 435 | cs->flags |= mask; |
70440cf2 TS |
436 | spin_unlock_irqrestore(&drv->lock, flags); |
437 | } | |
438 | ||
439 | static void make_invalid(struct cardstate *cs, unsigned mask) | |
440 | { | |
441 | unsigned long flags; | |
442 | struct gigaset_driver *drv = cs->driver; | |
443 | spin_lock_irqsave(&drv->lock, flags); | |
e468c048 | 444 | cs->flags &= ~mask; |
70440cf2 TS |
445 | spin_unlock_irqrestore(&drv->lock, flags); |
446 | } | |
447 | ||
1cec9727 TS |
448 | /** |
449 | * gigaset_freecs() - free all associated ressources of a device | |
450 | * @cs: device descriptor structure. | |
451 | * | |
452 | * Stops all tasklets and timers, unregisters the device from all | |
453 | * subsystems it was registered to, deallocates the device structure | |
454 | * @cs and all structures referenced from it. | |
455 | * Operations on the device should be stopped before calling this. | |
456 | */ | |
6fd5ea63 HL |
457 | void gigaset_freecs(struct cardstate *cs) |
458 | { | |
459 | int i; | |
460 | unsigned long flags; | |
461 | ||
462 | if (!cs) | |
463 | return; | |
464 | ||
abfd1dc7 | 465 | mutex_lock(&cs->mutex); |
6fd5ea63 | 466 | |
6fd5ea63 | 467 | spin_lock_irqsave(&cs->lock, flags); |
69049cc8 | 468 | cs->running = 0; |
917f5085 TS |
469 | spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are |
470 | not rescheduled below */ | |
6fd5ea63 HL |
471 | |
472 | tasklet_kill(&cs->event_tasklet); | |
473 | del_timer_sync(&cs->timer); | |
474 | ||
475 | switch (cs->cs_init) { | |
476 | default: | |
088ec0cc TS |
477 | /* clear B channel structures */ |
478 | for (i = 0; i < cs->channels; ++i) { | |
479 | gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i); | |
480 | gigaset_freebcs(cs->bcs + i); | |
481 | } | |
482 | ||
3dda4e37 HL |
483 | /* clear device sysfs */ |
484 | gigaset_free_dev_sysfs(cs); | |
485 | ||
6fd5ea63 HL |
486 | gigaset_if_free(cs); |
487 | ||
784d5858 | 488 | gig_dbg(DEBUG_INIT, "clearing hw"); |
6fd5ea63 HL |
489 | cs->ops->freecshw(cs); |
490 | ||
6fd5ea63 HL |
491 | /* fall through */ |
492 | case 2: /* error in initcshw */ | |
493 | /* Deregister from LL */ | |
494 | make_invalid(cs, VALID_ID); | |
bc35b4e3 | 495 | gigaset_isdn_unregdev(cs); |
6fd5ea63 HL |
496 | |
497 | /* fall through */ | |
088ec0cc | 498 | case 1: /* error when registering to LL */ |
784d5858 | 499 | gig_dbg(DEBUG_INIT, "clearing at_state"); |
6fd5ea63 | 500 | clear_at_state(&cs->at_state); |
7643ffbd | 501 | dealloc_temp_at_states(cs); |
bc882b18 | 502 | clear_events(cs); |
1862c14e | 503 | tty_port_destroy(&cs->port); |
6fd5ea63 HL |
504 | |
505 | /* fall through */ | |
088ec0cc | 506 | case 0: /* error in basic setup */ |
784d5858 | 507 | gig_dbg(DEBUG_INIT, "freeing inbuf"); |
6fd5ea63 | 508 | kfree(cs->inbuf); |
bc882b18 | 509 | kfree(cs->bcs); |
6fd5ea63 | 510 | } |
bc882b18 | 511 | |
abfd1dc7 | 512 | mutex_unlock(&cs->mutex); |
6fd5ea63 HL |
513 | free_cs(cs); |
514 | } | |
515 | EXPORT_SYMBOL_GPL(gigaset_freecs); | |
516 | ||
517 | void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs, | |
784d5858 | 518 | struct cardstate *cs, int cid) |
6fd5ea63 HL |
519 | { |
520 | int i; | |
521 | ||
522 | INIT_LIST_HEAD(&at_state->list); | |
523 | at_state->waiting = 0; | |
524 | at_state->getstring = 0; | |
525 | at_state->pending_commands = 0; | |
526 | at_state->timer_expires = 0; | |
527 | at_state->timer_active = 0; | |
69049cc8 TS |
528 | at_state->timer_index = 0; |
529 | at_state->seq_index = 0; | |
6fd5ea63 HL |
530 | at_state->ConState = 0; |
531 | for (i = 0; i < STR_NUM; ++i) | |
532 | at_state->str_var[i] = NULL; | |
533 | at_state->int_var[VAR_ZDLE] = 0; | |
534 | at_state->int_var[VAR_ZCTP] = -1; | |
535 | at_state->int_var[VAR_ZSAU] = ZSAU_NULL; | |
536 | at_state->cs = cs; | |
537 | at_state->bcs = bcs; | |
538 | at_state->cid = cid; | |
539 | if (!cid) | |
540 | at_state->replystruct = cs->tabnocid; | |
541 | else | |
542 | at_state->replystruct = cs->tabcid; | |
543 | } | |
544 | ||
545 | ||
2032e2c2 | 546 | static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct cardstate *cs) |
6fd5ea63 HL |
547 | /* inbuf->read must be allocated before! */ |
548 | { | |
9d4bee2b TS |
549 | inbuf->head = 0; |
550 | inbuf->tail = 0; | |
6fd5ea63 | 551 | inbuf->cs = cs; |
2032e2c2 | 552 | inbuf->inputstate = INS_command; |
6fd5ea63 HL |
553 | } |
554 | ||
1cec9727 TS |
555 | /** |
556 | * gigaset_fill_inbuf() - append received data to input buffer | |
557 | * @inbuf: buffer structure. | |
558 | * @src: received data. | |
559 | * @numbytes: number of bytes received. | |
81fa7b82 TS |
560 | * |
561 | * Return value: !=0 if some data was appended | |
1cec9727 | 562 | */ |
714e8236 TS |
563 | int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src, |
564 | unsigned numbytes) | |
565 | { | |
566 | unsigned n, head, tail, bytesleft; | |
567 | ||
568 | gig_dbg(DEBUG_INTR, "received %u bytes", numbytes); | |
569 | ||
570 | if (!numbytes) | |
571 | return 0; | |
572 | ||
573 | bytesleft = numbytes; | |
9d4bee2b TS |
574 | tail = inbuf->tail; |
575 | head = inbuf->head; | |
714e8236 TS |
576 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail); |
577 | ||
578 | while (bytesleft) { | |
579 | if (head > tail) | |
580 | n = head - 1 - tail; | |
581 | else if (head == 0) | |
475be4d8 | 582 | n = (RBUFSIZE - 1) - tail; |
714e8236 TS |
583 | else |
584 | n = RBUFSIZE - tail; | |
585 | if (!n) { | |
586 | dev_err(inbuf->cs->dev, | |
898eb71c JP |
587 | "buffer overflow (%u bytes lost)\n", |
588 | bytesleft); | |
714e8236 TS |
589 | break; |
590 | } | |
591 | if (n > bytesleft) | |
592 | n = bytesleft; | |
593 | memcpy(inbuf->data + tail, src, n); | |
594 | bytesleft -= n; | |
595 | tail = (tail + n) % RBUFSIZE; | |
596 | src += n; | |
597 | } | |
598 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 599 | inbuf->tail = tail; |
714e8236 TS |
600 | return numbytes != bytesleft; |
601 | } | |
602 | EXPORT_SYMBOL_GPL(gigaset_fill_inbuf); | |
603 | ||
6fd5ea63 | 604 | /* Initialize the b-channel structure */ |
81fa7b82 TS |
605 | static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs, |
606 | int channel) | |
6fd5ea63 HL |
607 | { |
608 | int i; | |
609 | ||
d9ba9c91 | 610 | bcs->tx_skb = NULL; |
6fd5ea63 HL |
611 | |
612 | skb_queue_head_init(&bcs->squeue); | |
613 | ||
614 | bcs->corrupted = 0; | |
615 | bcs->trans_down = 0; | |
616 | bcs->trans_up = 0; | |
617 | ||
784d5858 | 618 | gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel); |
6fd5ea63 HL |
619 | gigaset_at_init(&bcs->at_state, bcs, cs, -1); |
620 | ||
6fd5ea63 HL |
621 | #ifdef CONFIG_GIGASET_DEBUG |
622 | bcs->emptycount = 0; | |
623 | #endif | |
624 | ||
e7752ee2 TS |
625 | bcs->rx_bufsize = 0; |
626 | bcs->rx_skb = NULL; | |
627 | bcs->rx_fcs = PPP_INITFCS; | |
6fd5ea63 | 628 | bcs->inputstate = 0; |
6fd5ea63 HL |
629 | bcs->channel = channel; |
630 | bcs->cs = cs; | |
631 | ||
632 | bcs->chstate = 0; | |
633 | bcs->use_count = 1; | |
634 | bcs->busy = 0; | |
635 | bcs->ignore = cs->ignoreframes; | |
636 | ||
637 | for (i = 0; i < AT_NUM; ++i) | |
638 | bcs->commands[i] = NULL; | |
639 | ||
1b4843c5 TS |
640 | spin_lock_init(&bcs->aplock); |
641 | bcs->ap = NULL; | |
642 | bcs->apconnstate = 0; | |
643 | ||
784d5858 | 644 | gig_dbg(DEBUG_INIT, " setting up bcs[%d]->hw", channel); |
81fa7b82 | 645 | return cs->ops->initbcshw(bcs); |
6fd5ea63 HL |
646 | } |
647 | ||
1cec9727 TS |
648 | /** |
649 | * gigaset_initcs() - initialize device structure | |
650 | * @drv: hardware driver the device belongs to | |
651 | * @channels: number of B channels supported by device | |
652 | * @onechannel: !=0 if B channel data and AT commands share one | |
653 | * communication channel (M10x), | |
654 | * ==0 if B channels have separate communication channels (base) | |
655 | * @ignoreframes: number of frames to ignore after setting up B channel | |
656 | * @cidmode: !=0: start in CallID mode | |
657 | * @modulename: name of driver module for LL registration | |
658 | * | |
6fd5ea63 HL |
659 | * Allocate and initialize cardstate structure for Gigaset driver |
660 | * Calls hardware dependent gigaset_initcshw() function | |
661 | * Calls B channel initialization function gigaset_initbcs() for each B channel | |
1cec9727 TS |
662 | * |
663 | * Return value: | |
6fd5ea63 HL |
664 | * pointer to cardstate structure |
665 | */ | |
666 | struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels, | |
667 | int onechannel, int ignoreframes, | |
668 | int cidmode, const char *modulename) | |
669 | { | |
d9ba9c91 | 670 | struct cardstate *cs; |
69049cc8 | 671 | unsigned long flags; |
6fd5ea63 HL |
672 | int i; |
673 | ||
784d5858 | 674 | gig_dbg(DEBUG_INIT, "allocating cs"); |
d9ba9c91 TS |
675 | cs = alloc_cs(drv); |
676 | if (!cs) { | |
c8770dca | 677 | pr_err("maximum number of devices exceeded\n"); |
e702ff0b TS |
678 | return NULL; |
679 | } | |
e702ff0b | 680 | |
6fd5ea63 HL |
681 | cs->cs_init = 0; |
682 | cs->channels = channels; | |
683 | cs->onechannel = onechannel; | |
684 | cs->ignoreframes = ignoreframes; | |
685 | INIT_LIST_HEAD(&cs->temp_at_states); | |
69049cc8 | 686 | cs->running = 0; |
4cfea08e | 687 | timer_setup(&cs->timer, timer_tick, 0); |
6fd5ea63 | 688 | spin_lock_init(&cs->ev_lock); |
69049cc8 TS |
689 | cs->ev_tail = 0; |
690 | cs->ev_head = 0; | |
abfd1dc7 | 691 | |
5452fee2 | 692 | tasklet_init(&cs->event_tasklet, gigaset_handle_event, |
917f5085 | 693 | (unsigned long) cs); |
48a7466f | 694 | tty_port_init(&cs->port); |
9d4bee2b | 695 | cs->commands_pending = 0; |
6fd5ea63 HL |
696 | cs->cur_at_seq = 0; |
697 | cs->gotfwver = -1; | |
784d5858 | 698 | cs->dev = NULL; |
01107d34 | 699 | cs->tty_dev = NULL; |
69049cc8 | 700 | cs->cidmode = cidmode != 0; |
528efc6a TS |
701 | cs->tabnocid = gigaset_tab_nocid; |
702 | cs->tabcid = gigaset_tab_cid; | |
6fd5ea63 HL |
703 | |
704 | init_waitqueue_head(&cs->waitqueue); | |
705 | cs->waiting = 0; | |
706 | ||
9d4bee2b TS |
707 | cs->mode = M_UNKNOWN; |
708 | cs->mstate = MS_UNINITIALIZED; | |
6fd5ea63 | 709 | |
6da2ec56 | 710 | cs->bcs = kmalloc_array(channels, sizeof(struct bc_state), GFP_KERNEL); |
bc882b18 TS |
711 | cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL); |
712 | if (!cs->bcs || !cs->inbuf) { | |
713 | pr_err("out of memory\n"); | |
714 | goto error; | |
715 | } | |
6fd5ea63 HL |
716 | ++cs->cs_init; |
717 | ||
784d5858 | 718 | gig_dbg(DEBUG_INIT, "setting up at_state"); |
6fd5ea63 HL |
719 | spin_lock_init(&cs->lock); |
720 | gigaset_at_init(&cs->at_state, NULL, cs, 0); | |
721 | cs->dle = 0; | |
722 | cs->cbytes = 0; | |
723 | ||
784d5858 | 724 | gig_dbg(DEBUG_INIT, "setting up inbuf"); |
2032e2c2 | 725 | gigaset_inbuf_init(cs->inbuf, cs); |
6fd5ea63 | 726 | |
69049cc8 TS |
727 | cs->connected = 0; |
728 | cs->isdn_up = 0; | |
6fd5ea63 | 729 | |
784d5858 | 730 | gig_dbg(DEBUG_INIT, "setting up cmdbuf"); |
6fd5ea63 HL |
731 | cs->cmdbuf = cs->lastcmdbuf = NULL; |
732 | spin_lock_init(&cs->cmdlock); | |
733 | cs->curlen = 0; | |
734 | cs->cmdbytes = 0; | |
735 | ||
784d5858 | 736 | gig_dbg(DEBUG_INIT, "setting up iif"); |
81fa7b82 | 737 | if (gigaset_isdn_regdev(cs, modulename) < 0) { |
c8770dca | 738 | pr_err("error registering ISDN device\n"); |
1862c14e | 739 | goto error; |
6fd5ea63 HL |
740 | } |
741 | ||
742 | make_valid(cs, VALID_ID); | |
743 | ++cs->cs_init; | |
784d5858 | 744 | gig_dbg(DEBUG_INIT, "setting up hw"); |
81fa7b82 | 745 | if (cs->ops->initcshw(cs) < 0) |
1862c14e | 746 | goto error; |
6fd5ea63 HL |
747 | |
748 | ++cs->cs_init; | |
749 | ||
7435f50e | 750 | /* set up character device */ |
6fd5ea63 HL |
751 | gigaset_if_init(cs); |
752 | ||
3dda4e37 HL |
753 | /* set up device sysfs */ |
754 | gigaset_init_dev_sysfs(cs); | |
755 | ||
088ec0cc TS |
756 | /* set up channel data structures */ |
757 | for (i = 0; i < channels; ++i) { | |
758 | gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i); | |
81fa7b82 | 759 | if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) { |
088ec0cc | 760 | pr_err("could not allocate channel %d data\n", i); |
1862c14e | 761 | goto error; |
088ec0cc TS |
762 | } |
763 | } | |
764 | ||
69049cc8 TS |
765 | spin_lock_irqsave(&cs->lock, flags); |
766 | cs->running = 1; | |
767 | spin_unlock_irqrestore(&cs->lock, flags); | |
ec81b5e6 | 768 | cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK); |
6fd5ea63 HL |
769 | add_timer(&cs->timer); |
770 | ||
784d5858 | 771 | gig_dbg(DEBUG_INIT, "cs initialized"); |
6fd5ea63 | 772 | return cs; |
1862c14e | 773 | |
e702ff0b | 774 | error: |
784d5858 | 775 | gig_dbg(DEBUG_INIT, "failed"); |
6fd5ea63 HL |
776 | gigaset_freecs(cs); |
777 | return NULL; | |
778 | } | |
779 | EXPORT_SYMBOL_GPL(gigaset_initcs); | |
780 | ||
73a88814 | 781 | /* ReInitialize the b-channel structure on hangup */ |
6fd5ea63 HL |
782 | void gigaset_bcs_reinit(struct bc_state *bcs) |
783 | { | |
784 | struct sk_buff *skb; | |
785 | struct cardstate *cs = bcs->cs; | |
786 | unsigned long flags; | |
787 | ||
788 | while ((skb = skb_dequeue(&bcs->squeue)) != NULL) | |
789 | dev_kfree_skb(skb); | |
790 | ||
917f5085 | 791 | spin_lock_irqsave(&cs->lock, flags); |
6fd5ea63 HL |
792 | clear_at_state(&bcs->at_state); |
793 | bcs->at_state.ConState = 0; | |
794 | bcs->at_state.timer_active = 0; | |
795 | bcs->at_state.timer_expires = 0; | |
784d5858 | 796 | bcs->at_state.cid = -1; /* No CID defined */ |
6fd5ea63 HL |
797 | spin_unlock_irqrestore(&cs->lock, flags); |
798 | ||
799 | bcs->inputstate = 0; | |
800 | ||
801 | #ifdef CONFIG_GIGASET_DEBUG | |
802 | bcs->emptycount = 0; | |
803 | #endif | |
804 | ||
e7752ee2 | 805 | bcs->rx_fcs = PPP_INITFCS; |
6fd5ea63 HL |
806 | bcs->chstate = 0; |
807 | ||
808 | bcs->ignore = cs->ignoreframes; | |
e7752ee2 TS |
809 | dev_kfree_skb(bcs->rx_skb); |
810 | bcs->rx_skb = NULL; | |
6fd5ea63 HL |
811 | |
812 | cs->ops->reinitbcshw(bcs); | |
813 | } | |
814 | ||
815 | static void cleanup_cs(struct cardstate *cs) | |
816 | { | |
817 | struct cmdbuf_t *cb, *tcb; | |
818 | int i; | |
819 | unsigned long flags; | |
820 | ||
821 | spin_lock_irqsave(&cs->lock, flags); | |
822 | ||
9d4bee2b TS |
823 | cs->mode = M_UNKNOWN; |
824 | cs->mstate = MS_UNINITIALIZED; | |
6fd5ea63 HL |
825 | |
826 | clear_at_state(&cs->at_state); | |
7643ffbd | 827 | dealloc_temp_at_states(cs); |
6fd5ea63 HL |
828 | gigaset_at_init(&cs->at_state, NULL, cs, 0); |
829 | ||
6fd5ea63 | 830 | cs->inbuf->inputstate = INS_command; |
9d4bee2b TS |
831 | cs->inbuf->head = 0; |
832 | cs->inbuf->tail = 0; | |
6fd5ea63 HL |
833 | |
834 | cb = cs->cmdbuf; | |
835 | while (cb) { | |
836 | tcb = cb; | |
837 | cb = cb->next; | |
838 | kfree(tcb); | |
839 | } | |
840 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
841 | cs->curlen = 0; | |
842 | cs->cmdbytes = 0; | |
843 | cs->gotfwver = -1; | |
844 | cs->dle = 0; | |
845 | cs->cur_at_seq = 0; | |
9d4bee2b | 846 | cs->commands_pending = 0; |
6fd5ea63 HL |
847 | cs->cbytes = 0; |
848 | ||
849 | spin_unlock_irqrestore(&cs->lock, flags); | |
850 | ||
851 | for (i = 0; i < cs->channels; ++i) { | |
852 | gigaset_freebcs(cs->bcs + i); | |
81fa7b82 | 853 | if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) |
c8770dca | 854 | pr_err("could not allocate channel %d data\n", i); |
6fd5ea63 HL |
855 | } |
856 | ||
857 | if (cs->waiting) { | |
858 | cs->cmd_result = -ENODEV; | |
859 | cs->waiting = 0; | |
860 | wake_up_interruptible(&cs->waitqueue); | |
861 | } | |
862 | } | |
863 | ||
864 | ||
1cec9727 TS |
865 | /** |
866 | * gigaset_start() - start device operations | |
867 | * @cs: device descriptor structure. | |
868 | * | |
869 | * Prepares the device for use by setting up communication parameters, | |
870 | * scheduling an EV_START event to initiate device initialization, and | |
871 | * waiting for completion of the initialization. | |
872 | * | |
873 | * Return value: | |
81fa7b82 | 874 | * 0 on success, error code < 0 on failure |
1cec9727 | 875 | */ |
6fd5ea63 HL |
876 | int gigaset_start(struct cardstate *cs) |
877 | { | |
69049cc8 TS |
878 | unsigned long flags; |
879 | ||
abfd1dc7 | 880 | if (mutex_lock_interruptible(&cs->mutex)) |
81fa7b82 | 881 | return -EBUSY; |
6fd5ea63 | 882 | |
69049cc8 TS |
883 | spin_lock_irqsave(&cs->lock, flags); |
884 | cs->connected = 1; | |
885 | spin_unlock_irqrestore(&cs->lock, flags); | |
6fd5ea63 | 886 | |
9d4bee2b | 887 | if (cs->mstate != MS_LOCKED) { |
475be4d8 | 888 | cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS); |
6fd5ea63 HL |
889 | cs->ops->baud_rate(cs, B115200); |
890 | cs->ops->set_line_ctrl(cs, CS8); | |
475be4d8 | 891 | cs->control_state = TIOCM_DTR | TIOCM_RTS; |
6fd5ea63 HL |
892 | } |
893 | ||
894 | cs->waiting = 1; | |
895 | ||
896 | if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) { | |
897 | cs->waiting = 0; | |
6fd5ea63 HL |
898 | goto error; |
899 | } | |
6fd5ea63 HL |
900 | gigaset_schedule_event(cs); |
901 | ||
902 | wait_event(cs->waitqueue, !cs->waiting); | |
903 | ||
abfd1dc7 | 904 | mutex_unlock(&cs->mutex); |
81fa7b82 | 905 | return 0; |
6fd5ea63 HL |
906 | |
907 | error: | |
abfd1dc7 | 908 | mutex_unlock(&cs->mutex); |
81fa7b82 | 909 | return -ENOMEM; |
6fd5ea63 HL |
910 | } |
911 | EXPORT_SYMBOL_GPL(gigaset_start); | |
912 | ||
1cec9727 TS |
913 | /** |
914 | * gigaset_shutdown() - shut down device operations | |
915 | * @cs: device descriptor structure. | |
916 | * | |
917 | * Deactivates the device by scheduling an EV_SHUTDOWN event and | |
918 | * waiting for completion of the shutdown. | |
919 | * | |
920 | * Return value: | |
81fa7b82 | 921 | * 0 - success, -ENODEV - error (no device associated) |
e468c048 TS |
922 | */ |
923 | int gigaset_shutdown(struct cardstate *cs) | |
6fd5ea63 | 924 | { |
abfd1dc7 | 925 | mutex_lock(&cs->mutex); |
6fd5ea63 | 926 | |
5d49c101 TS |
927 | if (!(cs->flags & VALID_MINOR)) { |
928 | mutex_unlock(&cs->mutex); | |
81fa7b82 | 929 | return -ENODEV; |
5d49c101 | 930 | } |
e468c048 | 931 | |
6fd5ea63 HL |
932 | cs->waiting = 1; |
933 | ||
1528b18f | 934 | if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) |
6fd5ea63 | 935 | goto exit; |
6fd5ea63 HL |
936 | gigaset_schedule_event(cs); |
937 | ||
2869b23e | 938 | wait_event(cs->waitqueue, !cs->waiting); |
6fd5ea63 HL |
939 | |
940 | cleanup_cs(cs); | |
941 | ||
942 | exit: | |
abfd1dc7 | 943 | mutex_unlock(&cs->mutex); |
e468c048 | 944 | return 0; |
6fd5ea63 HL |
945 | } |
946 | EXPORT_SYMBOL_GPL(gigaset_shutdown); | |
947 | ||
1cec9727 TS |
948 | /** |
949 | * gigaset_stop() - stop device operations | |
950 | * @cs: device descriptor structure. | |
951 | * | |
952 | * Stops operations on the device by scheduling an EV_STOP event and | |
953 | * waiting for completion of the shutdown. | |
954 | */ | |
6fd5ea63 HL |
955 | void gigaset_stop(struct cardstate *cs) |
956 | { | |
abfd1dc7 | 957 | mutex_lock(&cs->mutex); |
6fd5ea63 | 958 | |
6fd5ea63 HL |
959 | cs->waiting = 1; |
960 | ||
1528b18f | 961 | if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) |
6fd5ea63 | 962 | goto exit; |
6fd5ea63 HL |
963 | gigaset_schedule_event(cs); |
964 | ||
2869b23e | 965 | wait_event(cs->waitqueue, !cs->waiting); |
6fd5ea63 | 966 | |
6fd5ea63 HL |
967 | cleanup_cs(cs); |
968 | ||
969 | exit: | |
abfd1dc7 | 970 | mutex_unlock(&cs->mutex); |
6fd5ea63 HL |
971 | } |
972 | EXPORT_SYMBOL_GPL(gigaset_stop); | |
973 | ||
974 | static LIST_HEAD(drivers); | |
34af946a | 975 | static DEFINE_SPINLOCK(driver_lock); |
6fd5ea63 HL |
976 | |
977 | struct cardstate *gigaset_get_cs_by_id(int id) | |
978 | { | |
979 | unsigned long flags; | |
35dc8457 TS |
980 | struct cardstate *ret = NULL; |
981 | struct cardstate *cs; | |
6fd5ea63 HL |
982 | struct gigaset_driver *drv; |
983 | unsigned i; | |
984 | ||
985 | spin_lock_irqsave(&driver_lock, flags); | |
986 | list_for_each_entry(drv, &drivers, list) { | |
987 | spin_lock(&drv->lock); | |
988 | for (i = 0; i < drv->minors; ++i) { | |
e468c048 TS |
989 | cs = drv->cs + i; |
990 | if ((cs->flags & VALID_ID) && cs->myid == id) { | |
991 | ret = cs; | |
6fd5ea63 | 992 | break; |
e468c048 | 993 | } |
6fd5ea63 HL |
994 | } |
995 | spin_unlock(&drv->lock); | |
996 | if (ret) | |
997 | break; | |
998 | } | |
999 | spin_unlock_irqrestore(&driver_lock, flags); | |
1000 | return ret; | |
1001 | } | |
1002 | ||
8ca445df | 1003 | static struct cardstate *gigaset_get_cs_by_minor(unsigned minor) |
6fd5ea63 HL |
1004 | { |
1005 | unsigned long flags; | |
35dc8457 | 1006 | struct cardstate *ret = NULL; |
6fd5ea63 HL |
1007 | struct gigaset_driver *drv; |
1008 | unsigned index; | |
1009 | ||
1010 | spin_lock_irqsave(&driver_lock, flags); | |
1011 | list_for_each_entry(drv, &drivers, list) { | |
1012 | if (minor < drv->minor || minor >= drv->minor + drv->minors) | |
1013 | continue; | |
1014 | index = minor - drv->minor; | |
1015 | spin_lock(&drv->lock); | |
e468c048 | 1016 | if (drv->cs[index].flags & VALID_MINOR) |
6fd5ea63 HL |
1017 | ret = drv->cs + index; |
1018 | spin_unlock(&drv->lock); | |
1019 | if (ret) | |
1020 | break; | |
1021 | } | |
1022 | spin_unlock_irqrestore(&driver_lock, flags); | |
1023 | return ret; | |
1024 | } | |
1025 | ||
8ca445df AB |
1026 | struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty) |
1027 | { | |
8ca445df AB |
1028 | return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start); |
1029 | } | |
1030 | ||
1cec9727 TS |
1031 | /** |
1032 | * gigaset_freedriver() - free all associated ressources of a driver | |
1033 | * @drv: driver descriptor structure. | |
1034 | * | |
1035 | * Unregisters the driver from the system and deallocates the driver | |
1036 | * structure @drv and all structures referenced from it. | |
1037 | * All devices should be shut down before calling this. | |
1038 | */ | |
6fd5ea63 HL |
1039 | void gigaset_freedriver(struct gigaset_driver *drv) |
1040 | { | |
1041 | unsigned long flags; | |
1042 | ||
1043 | spin_lock_irqsave(&driver_lock, flags); | |
1044 | list_del(&drv->list); | |
1045 | spin_unlock_irqrestore(&driver_lock, flags); | |
1046 | ||
1047 | gigaset_if_freedriver(drv); | |
6fd5ea63 HL |
1048 | |
1049 | kfree(drv->cs); | |
6fd5ea63 HL |
1050 | kfree(drv); |
1051 | } | |
1052 | EXPORT_SYMBOL_GPL(gigaset_freedriver); | |
1053 | ||
1cec9727 TS |
1054 | /** |
1055 | * gigaset_initdriver() - initialize driver structure | |
1056 | * @minor: First minor number | |
1057 | * @minors: Number of minors this driver can handle | |
1058 | * @procname: Name of the driver | |
1059 | * @devname: Name of the device files (prefix without minor number) | |
1060 | * | |
6fd5ea63 | 1061 | * Allocate and initialize gigaset_driver structure. Initialize interface. |
1cec9727 TS |
1062 | * |
1063 | * Return value: | |
784d5858 | 1064 | * Pointer to the gigaset_driver structure on success, NULL on failure. |
6fd5ea63 HL |
1065 | */ |
1066 | struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors, | |
784d5858 TS |
1067 | const char *procname, |
1068 | const char *devname, | |
784d5858 TS |
1069 | const struct gigaset_ops *ops, |
1070 | struct module *owner) | |
6fd5ea63 HL |
1071 | { |
1072 | struct gigaset_driver *drv; | |
1073 | unsigned long flags; | |
1074 | unsigned i; | |
1075 | ||
1076 | drv = kmalloc(sizeof *drv, GFP_KERNEL); | |
1077 | if (!drv) | |
1078 | return NULL; | |
f4675c70 | 1079 | |
6fd5ea63 HL |
1080 | drv->have_tty = 0; |
1081 | drv->minor = minor; | |
1082 | drv->minors = minors; | |
1083 | spin_lock_init(&drv->lock); | |
1084 | drv->blocked = 0; | |
1085 | drv->ops = ops; | |
1086 | drv->owner = owner; | |
1087 | INIT_LIST_HEAD(&drv->list); | |
1088 | ||
6da2ec56 | 1089 | drv->cs = kmalloc_array(minors, sizeof(*drv->cs), GFP_KERNEL); |
6fd5ea63 | 1090 | if (!drv->cs) |
e702ff0b | 1091 | goto error; |
f4675c70 | 1092 | |
6fd5ea63 | 1093 | for (i = 0; i < minors; ++i) { |
e468c048 | 1094 | drv->cs[i].flags = 0; |
6fd5ea63 HL |
1095 | drv->cs[i].driver = drv; |
1096 | drv->cs[i].ops = drv->ops; | |
1097 | drv->cs[i].minor_index = i; | |
5d49c101 | 1098 | mutex_init(&drv->cs[i].mutex); |
6fd5ea63 HL |
1099 | } |
1100 | ||
f4eaa370 | 1101 | gigaset_if_initdriver(drv, procname, devname); |
6fd5ea63 HL |
1102 | |
1103 | spin_lock_irqsave(&driver_lock, flags); | |
1104 | list_add(&drv->list, &drivers); | |
1105 | spin_unlock_irqrestore(&driver_lock, flags); | |
1106 | ||
1107 | return drv; | |
1108 | ||
e702ff0b | 1109 | error: |
6fd5ea63 | 1110 | kfree(drv); |
6fd5ea63 HL |
1111 | return NULL; |
1112 | } | |
1113 | EXPORT_SYMBOL_GPL(gigaset_initdriver); | |
1114 | ||
1cec9727 TS |
1115 | /** |
1116 | * gigaset_blockdriver() - block driver | |
1117 | * @drv: driver descriptor structure. | |
1118 | * | |
1119 | * Prevents the driver from attaching new devices, in preparation for | |
1120 | * deregistration. | |
1121 | */ | |
6fd5ea63 HL |
1122 | void gigaset_blockdriver(struct gigaset_driver *drv) |
1123 | { | |
6fd5ea63 | 1124 | drv->blocked = 1; |
6fd5ea63 HL |
1125 | } |
1126 | EXPORT_SYMBOL_GPL(gigaset_blockdriver); | |
1127 | ||
1128 | static int __init gigaset_init_module(void) | |
1129 | { | |
1130 | /* in accordance with the principle of least astonishment, | |
1131 | * setting the 'debug' parameter to 1 activates a sensible | |
1132 | * set of default debug levels | |
1133 | */ | |
1134 | if (gigaset_debuglevel == 1) | |
1135 | gigaset_debuglevel = DEBUG_DEFAULT; | |
1136 | ||
2038724c | 1137 | pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n"); |
bc35b4e3 | 1138 | gigaset_isdn_regdrv(); |
6fd5ea63 HL |
1139 | return 0; |
1140 | } | |
1141 | ||
1142 | static void __exit gigaset_exit_module(void) | |
1143 | { | |
bc35b4e3 | 1144 | gigaset_isdn_unregdrv(); |
6fd5ea63 HL |
1145 | } |
1146 | ||
1147 | module_init(gigaset_init_module); | |
1148 | module_exit(gigaset_exit_module); | |
1149 | ||
1150 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
1151 | MODULE_DESCRIPTION(DRIVER_DESC); | |
1152 | ||
1153 | MODULE_LICENSE("GPL"); |