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 "gigaset.h"
17 #include <linux/isdnif.h>
18 #include <linux/export.h>
19
20 #define SBUFSIZE 4096 /* sk_buff payload size */
21 #define TRANSBUFSIZE 768 /* bytes per skb for transparent receive */
22 #define HW_HDR_LEN 2 /* Header size used to store ack info */
23 #define MAX_BUF_SIZE (SBUFSIZE - HW_HDR_LEN) /* max data packet from LL */
24
25 /* == Handling of I4L IO =====================================================*/
26
27 /* writebuf_from_LL
28 * called by LL to transmit data on an open channel
29 * inserts the buffer data into the send queue and starts the transmission
30 * Note that this operation must not sleep!
31 * When the buffer is processed completely, gigaset_skb_sent() should be called.
32 * parameters:
33 * driverID driver ID as assigned by LL
34 * channel channel number
35 * ack if != 0 LL wants to be notified on completion via
36 * statcallb(ISDN_STAT_BSENT)
37 * skb skb containing data to send
38 * return value:
39 * number of accepted bytes
40 * 0 if temporarily unable to accept data (out of buffer space)
41 * <0 on error (eg. -EINVAL)
42 */
writebuf_from_LL(int driverID,int channel,int ack,struct sk_buff * skb)43 static int writebuf_from_LL(int driverID, int channel, int ack,
44 struct sk_buff *skb)
45 {
46 struct cardstate *cs = gigaset_get_cs_by_id(driverID);
47 struct bc_state *bcs;
48 unsigned char *ack_header;
49 unsigned len;
50
51 if (!cs) {
52 pr_err("%s: invalid driver ID (%d)\n", __func__, driverID);
53 return -ENODEV;
54 }
55 if (channel < 0 || channel >= cs->channels) {
56 dev_err(cs->dev, "%s: invalid channel ID (%d)\n",
57 __func__, channel);
58 return -ENODEV;
59 }
60 bcs = &cs->bcs[channel];
61
62 /* can only handle linear sk_buffs */
63 if (skb_linearize(skb) < 0) {
64 dev_err(cs->dev, "%s: skb_linearize failed\n", __func__);
65 return -ENOMEM;
66 }
67 len = skb->len;
68
69 gig_dbg(DEBUG_LLDATA,
70 "Receiving data from LL (id: %d, ch: %d, ack: %d, sz: %d)",
71 driverID, channel, ack, len);
72
73 if (!len) {
74 if (ack)
75 dev_notice(cs->dev, "%s: not ACKing empty packet\n",
76 __func__);
77 return 0;
78 }
79 if (len > MAX_BUF_SIZE) {
80 dev_err(cs->dev, "%s: packet too large (%d bytes)\n",
81 __func__, len);
82 return -EINVAL;
83 }
84
85 /* set up acknowledgement header */
86 if (skb_headroom(skb) < HW_HDR_LEN) {
87 /* should never happen */
88 dev_err(cs->dev, "%s: insufficient skb headroom\n", __func__);
89 return -ENOMEM;
90 }
91 skb_set_mac_header(skb, -HW_HDR_LEN);
92 skb->mac_len = HW_HDR_LEN;
93 ack_header = skb_mac_header(skb);
94 if (ack) {
95 ack_header[0] = len & 0xff;
96 ack_header[1] = len >> 8;
97 } else {
98 ack_header[0] = ack_header[1] = 0;
99 }
100 gig_dbg(DEBUG_MCMD, "skb: len=%u, ack=%d: %02x %02x",
101 len, ack, ack_header[0], ack_header[1]);
102
103 /* pass to device-specific module */
104 return cs->ops->send_skb(bcs, skb);
105 }
106
107 /**
108 * gigaset_skb_sent() - acknowledge sending an skb
109 * @bcs: B channel descriptor structure.
110 * @skb: sent data.
111 *
112 * Called by hardware module {bas,ser,usb}_gigaset when the data in a
113 * skb has been successfully sent, for signalling completion to the LL.
114 */
gigaset_skb_sent(struct bc_state * bcs,struct sk_buff * skb)115 void gigaset_skb_sent(struct bc_state *bcs, struct sk_buff *skb)
116 {
117 isdn_if *iif = bcs->cs->iif;
118 unsigned char *ack_header = skb_mac_header(skb);
119 unsigned len;
120 isdn_ctrl response;
121
122 ++bcs->trans_up;
123
124 if (skb->len)
125 dev_warn(bcs->cs->dev, "%s: skb->len==%d\n",
126 __func__, skb->len);
127
128 len = ack_header[0] + ((unsigned) ack_header[1] << 8);
129 if (len) {
130 gig_dbg(DEBUG_MCMD, "ACKing to LL (id: %d, ch: %d, sz: %u)",
131 bcs->cs->myid, bcs->channel, len);
132
133 response.driver = bcs->cs->myid;
134 response.command = ISDN_STAT_BSENT;
135 response.arg = bcs->channel;
136 response.parm.length = len;
137 iif->statcallb(&response);
138 }
139 }
140 EXPORT_SYMBOL_GPL(gigaset_skb_sent);
141
142 /**
143 * gigaset_skb_rcvd() - pass received skb to LL
144 * @bcs: B channel descriptor structure.
145 * @skb: received data.
146 *
147 * Called by hardware module {bas,ser,usb}_gigaset when user data has
148 * been successfully received, for passing to the LL.
149 * Warning: skb must not be accessed anymore!
150 */
gigaset_skb_rcvd(struct bc_state * bcs,struct sk_buff * skb)151 void gigaset_skb_rcvd(struct bc_state *bcs, struct sk_buff *skb)
152 {
153 isdn_if *iif = bcs->cs->iif;
154
155 iif->rcvcallb_skb(bcs->cs->myid, bcs->channel, skb);
156 bcs->trans_down++;
157 }
158 EXPORT_SYMBOL_GPL(gigaset_skb_rcvd);
159
160 /**
161 * gigaset_isdn_rcv_err() - signal receive error
162 * @bcs: B channel descriptor structure.
163 *
164 * Called by hardware module {bas,ser,usb}_gigaset when a receive error
165 * has occurred, for signalling to the LL.
166 */
gigaset_isdn_rcv_err(struct bc_state * bcs)167 void gigaset_isdn_rcv_err(struct bc_state *bcs)
168 {
169 isdn_if *iif = bcs->cs->iif;
170 isdn_ctrl response;
171
172 /* if currently ignoring packets, just count down */
173 if (bcs->ignore) {
174 bcs->ignore--;
175 return;
176 }
177
178 /* update statistics */
179 bcs->corrupted++;
180
181 /* error -> LL */
182 gig_dbg(DEBUG_CMD, "sending L1ERR");
183 response.driver = bcs->cs->myid;
184 response.command = ISDN_STAT_L1ERR;
185 response.arg = bcs->channel;
186 response.parm.errcode = ISDN_STAT_L1ERR_RECV;
187 iif->statcallb(&response);
188 }
189 EXPORT_SYMBOL_GPL(gigaset_isdn_rcv_err);
190
191 /* This function will be called by LL to send commands
192 * NOTE: LL ignores the returned value, for commands other than ISDN_CMD_IOCTL,
193 * so don't put too much effort into it.
194 */
command_from_LL(isdn_ctrl * cntrl)195 static int command_from_LL(isdn_ctrl *cntrl)
196 {
197 struct cardstate *cs;
198 struct bc_state *bcs;
199 int retval = 0;
200 char **commands;
201 int ch;
202 int i;
203 size_t l;
204
205 gig_dbg(DEBUG_CMD, "driver: %d, command: %d, arg: 0x%lx",
206 cntrl->driver, cntrl->command, cntrl->arg);
207
208 cs = gigaset_get_cs_by_id(cntrl->driver);
209 if (cs == NULL) {
210 pr_err("%s: invalid driver ID (%d)\n", __func__, cntrl->driver);
211 return -ENODEV;
212 }
213 ch = cntrl->arg & 0xff;
214
215 switch (cntrl->command) {
216 case ISDN_CMD_IOCTL:
217 dev_warn(cs->dev, "ISDN_CMD_IOCTL not supported\n");
218 return -EINVAL;
219
220 case ISDN_CMD_DIAL:
221 gig_dbg(DEBUG_CMD,
222 "ISDN_CMD_DIAL (phone: %s, msn: %s, si1: %d, si2: %d)",
223 cntrl->parm.setup.phone, cntrl->parm.setup.eazmsn,
224 cntrl->parm.setup.si1, cntrl->parm.setup.si2);
225
226 if (ch >= cs->channels) {
227 dev_err(cs->dev,
228 "ISDN_CMD_DIAL: invalid channel (%d)\n", ch);
229 return -EINVAL;
230 }
231 bcs = cs->bcs + ch;
232 if (gigaset_get_channel(bcs) < 0) {
233 dev_err(cs->dev, "ISDN_CMD_DIAL: channel not free\n");
234 return -EBUSY;
235 }
236 switch (bcs->proto2) {
237 case L2_HDLC:
238 bcs->rx_bufsize = SBUFSIZE;
239 break;
240 default: /* assume transparent */
241 bcs->rx_bufsize = TRANSBUFSIZE;
242 }
243 dev_kfree_skb(bcs->rx_skb);
244 gigaset_new_rx_skb(bcs);
245
246 commands = kcalloc(AT_NUM, sizeof(*commands), GFP_ATOMIC);
247 if (!commands) {
248 gigaset_free_channel(bcs);
249 dev_err(cs->dev, "ISDN_CMD_DIAL: out of memory\n");
250 return -ENOMEM;
251 }
252
253 l = 3 + strlen(cntrl->parm.setup.phone);
254 commands[AT_DIAL] = kmalloc(l, GFP_ATOMIC);
255 if (!commands[AT_DIAL])
256 goto oom;
257 if (cntrl->parm.setup.phone[0] == '*' &&
258 cntrl->parm.setup.phone[1] == '*') {
259 /* internal call: translate ** prefix to CTP value */
260 commands[AT_TYPE] = kstrdup("^SCTP=0\r", GFP_ATOMIC);
261 if (!commands[AT_TYPE])
262 goto oom;
263 snprintf(commands[AT_DIAL], l,
264 "D%s\r", cntrl->parm.setup.phone + 2);
265 } else {
266 commands[AT_TYPE] = kstrdup("^SCTP=1\r", GFP_ATOMIC);
267 if (!commands[AT_TYPE])
268 goto oom;
269 snprintf(commands[AT_DIAL], l,
270 "D%s\r", cntrl->parm.setup.phone);
271 }
272
273 l = strlen(cntrl->parm.setup.eazmsn);
274 if (l) {
275 l += 8;
276 commands[AT_MSN] = kmalloc(l, GFP_ATOMIC);
277 if (!commands[AT_MSN])
278 goto oom;
279 snprintf(commands[AT_MSN], l, "^SMSN=%s\r",
280 cntrl->parm.setup.eazmsn);
281 }
282
283 switch (cntrl->parm.setup.si1) {
284 case 1: /* audio */
285 /* BC = 9090A3: 3.1 kHz audio, A-law */
286 commands[AT_BC] = kstrdup("^SBC=9090A3\r", GFP_ATOMIC);
287 if (!commands[AT_BC])
288 goto oom;
289 break;
290 case 7: /* data */
291 default: /* hope the app knows what it is doing */
292 /* BC = 8890: unrestricted digital information */
293 commands[AT_BC] = kstrdup("^SBC=8890\r", GFP_ATOMIC);
294 if (!commands[AT_BC])
295 goto oom;
296 }
297 /* ToDo: other si1 values, inspect si2, set HLC/LLC */
298
299 commands[AT_PROTO] = kmalloc(9, GFP_ATOMIC);
300 if (!commands[AT_PROTO])
301 goto oom;
302 snprintf(commands[AT_PROTO], 9, "^SBPR=%u\r", bcs->proto2);
303
304 commands[AT_ISO] = kmalloc(9, GFP_ATOMIC);
305 if (!commands[AT_ISO])
306 goto oom;
307 snprintf(commands[AT_ISO], 9, "^SISO=%u\r",
308 (unsigned) bcs->channel + 1);
309
310 if (!gigaset_add_event(cs, &bcs->at_state, EV_DIAL, commands,
311 bcs->at_state.seq_index, NULL)) {
312 for (i = 0; i < AT_NUM; ++i)
313 kfree(commands[i]);
314 kfree(commands);
315 gigaset_free_channel(bcs);
316 return -ENOMEM;
317 }
318 gigaset_schedule_event(cs);
319 break;
320 case ISDN_CMD_ACCEPTD:
321 gig_dbg(DEBUG_CMD, "ISDN_CMD_ACCEPTD");
322 if (ch >= cs->channels) {
323 dev_err(cs->dev,
324 "ISDN_CMD_ACCEPTD: invalid channel (%d)\n", ch);
325 return -EINVAL;
326 }
327 bcs = cs->bcs + ch;
328 switch (bcs->proto2) {
329 case L2_HDLC:
330 bcs->rx_bufsize = SBUFSIZE;
331 break;
332 default: /* assume transparent */
333 bcs->rx_bufsize = TRANSBUFSIZE;
334 }
335 dev_kfree_skb(bcs->rx_skb);
336 gigaset_new_rx_skb(bcs);
337 if (!gigaset_add_event(cs, &bcs->at_state,
338 EV_ACCEPT, NULL, 0, NULL))
339 return -ENOMEM;
340 gigaset_schedule_event(cs);
341
342 break;
343 case ISDN_CMD_HANGUP:
344 gig_dbg(DEBUG_CMD, "ISDN_CMD_HANGUP");
345 if (ch >= cs->channels) {
346 dev_err(cs->dev,
347 "ISDN_CMD_HANGUP: invalid channel (%d)\n", ch);
348 return -EINVAL;
349 }
350 bcs = cs->bcs + ch;
351 if (!gigaset_add_event(cs, &bcs->at_state,
352 EV_HUP, NULL, 0, NULL))
353 return -ENOMEM;
354 gigaset_schedule_event(cs);
355
356 break;
357 case ISDN_CMD_CLREAZ: /* Do not signal incoming signals */
358 dev_info(cs->dev, "ignoring ISDN_CMD_CLREAZ\n");
359 break;
360 case ISDN_CMD_SETEAZ: /* Signal incoming calls for given MSN */
361 dev_info(cs->dev, "ignoring ISDN_CMD_SETEAZ (%s)\n",
362 cntrl->parm.num);
363 break;
364 case ISDN_CMD_SETL2: /* Set L2 to given protocol */
365 if (ch >= cs->channels) {
366 dev_err(cs->dev,
367 "ISDN_CMD_SETL2: invalid channel (%d)\n", ch);
368 return -EINVAL;
369 }
370 bcs = cs->bcs + ch;
371 if (bcs->chstate & CHS_D_UP) {
372 dev_err(cs->dev,
373 "ISDN_CMD_SETL2: channel active (%d)\n", ch);
374 return -EINVAL;
375 }
376 switch (cntrl->arg >> 8) {
377 case ISDN_PROTO_L2_HDLC:
378 gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_HDLC");
379 bcs->proto2 = L2_HDLC;
380 break;
381 case ISDN_PROTO_L2_TRANS:
382 gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL2: setting L2_VOICE");
383 bcs->proto2 = L2_VOICE;
384 break;
385 default:
386 dev_err(cs->dev,
387 "ISDN_CMD_SETL2: unsupported protocol (%lu)\n",
388 cntrl->arg >> 8);
389 return -EINVAL;
390 }
391 break;
392 case ISDN_CMD_SETL3: /* Set L3 to given protocol */
393 gig_dbg(DEBUG_CMD, "ISDN_CMD_SETL3");
394 if (ch >= cs->channels) {
395 dev_err(cs->dev,
396 "ISDN_CMD_SETL3: invalid channel (%d)\n", ch);
397 return -EINVAL;
398 }
399
400 if (cntrl->arg >> 8 != ISDN_PROTO_L3_TRANS) {
401 dev_err(cs->dev,
402 "ISDN_CMD_SETL3: unsupported protocol (%lu)\n",
403 cntrl->arg >> 8);
404 return -EINVAL;
405 }
406
407 break;
408
409 default:
410 gig_dbg(DEBUG_CMD, "unknown command %d from LL",
411 cntrl->command);
412 return -EINVAL;
413 }
414
415 return retval;
416
417 oom:
418 dev_err(bcs->cs->dev, "out of memory\n");
419 for (i = 0; i < AT_NUM; ++i)
420 kfree(commands[i]);
421 kfree(commands);
422 gigaset_free_channel(bcs);
423 return -ENOMEM;
424 }
425
gigaset_i4l_cmd(struct cardstate * cs,int cmd)426 static void gigaset_i4l_cmd(struct cardstate *cs, int cmd)
427 {
428 isdn_if *iif = cs->iif;
429 isdn_ctrl command;
430
431 command.driver = cs->myid;
432 command.command = cmd;
433 command.arg = 0;
434 iif->statcallb(&command);
435 }
436
gigaset_i4l_channel_cmd(struct bc_state * bcs,int cmd)437 static void gigaset_i4l_channel_cmd(struct bc_state *bcs, int cmd)
438 {
439 isdn_if *iif = bcs->cs->iif;
440 isdn_ctrl command;
441
442 command.driver = bcs->cs->myid;
443 command.command = cmd;
444 command.arg = bcs->channel;
445 iif->statcallb(&command);
446 }
447
448 /**
449 * gigaset_isdn_icall() - signal incoming call
450 * @at_state: connection state structure.
451 *
452 * Called by main module to notify the LL that an incoming call has been
453 * received. @at_state contains the parameters of the call.
454 *
455 * Return value: call disposition (ICALL_*)
456 */
gigaset_isdn_icall(struct at_state_t * at_state)457 int gigaset_isdn_icall(struct at_state_t *at_state)
458 {
459 struct cardstate *cs = at_state->cs;
460 struct bc_state *bcs = at_state->bcs;
461 isdn_if *iif = cs->iif;
462 isdn_ctrl response;
463 int retval;
464
465 /* fill ICALL structure */
466 response.parm.setup.si1 = 0; /* default: unknown */
467 response.parm.setup.si2 = 0;
468 response.parm.setup.screen = 0;
469 response.parm.setup.plan = 0;
470 if (!at_state->str_var[STR_ZBC]) {
471 /* no BC (internal call): assume speech, A-law */
472 response.parm.setup.si1 = 1;
473 } else if (!strcmp(at_state->str_var[STR_ZBC], "8890")) {
474 /* unrestricted digital information */
475 response.parm.setup.si1 = 7;
476 } else if (!strcmp(at_state->str_var[STR_ZBC], "8090A3")) {
477 /* speech, A-law */
478 response.parm.setup.si1 = 1;
479 } else if (!strcmp(at_state->str_var[STR_ZBC], "9090A3")) {
480 /* 3,1 kHz audio, A-law */
481 response.parm.setup.si1 = 1;
482 response.parm.setup.si2 = 2;
483 } else {
484 dev_warn(cs->dev, "RING ignored - unsupported BC %s\n",
485 at_state->str_var[STR_ZBC]);
486 return ICALL_IGNORE;
487 }
488 if (at_state->str_var[STR_NMBR]) {
489 strlcpy(response.parm.setup.phone, at_state->str_var[STR_NMBR],
490 sizeof response.parm.setup.phone);
491 } else
492 response.parm.setup.phone[0] = 0;
493 if (at_state->str_var[STR_ZCPN]) {
494 strlcpy(response.parm.setup.eazmsn, at_state->str_var[STR_ZCPN],
495 sizeof response.parm.setup.eazmsn);
496 } else
497 response.parm.setup.eazmsn[0] = 0;
498
499 if (!bcs) {
500 dev_notice(cs->dev, "no channel for incoming call\n");
501 response.command = ISDN_STAT_ICALLW;
502 response.arg = 0;
503 } else {
504 gig_dbg(DEBUG_CMD, "Sending ICALL");
505 response.command = ISDN_STAT_ICALL;
506 response.arg = bcs->channel;
507 }
508 response.driver = cs->myid;
509 retval = iif->statcallb(&response);
510 gig_dbg(DEBUG_CMD, "Response: %d", retval);
511 switch (retval) {
512 case 0: /* no takers */
513 return ICALL_IGNORE;
514 case 1: /* alerting */
515 bcs->chstate |= CHS_NOTIFY_LL;
516 return ICALL_ACCEPT;
517 case 2: /* reject */
518 return ICALL_REJECT;
519 case 3: /* incomplete */
520 dev_warn(cs->dev,
521 "LL requested unsupported feature: Incomplete Number\n");
522 return ICALL_IGNORE;
523 case 4: /* proceeding */
524 /* Gigaset will send ALERTING anyway.
525 * There doesn't seem to be a way to avoid this.
526 */
527 return ICALL_ACCEPT;
528 case 5: /* deflect */
529 dev_warn(cs->dev,
530 "LL requested unsupported feature: Call Deflection\n");
531 return ICALL_IGNORE;
532 default:
533 dev_err(cs->dev, "LL error %d on ICALL\n", retval);
534 return ICALL_IGNORE;
535 }
536 }
537
538 /**
539 * gigaset_isdn_connD() - signal D channel connect
540 * @bcs: B channel descriptor structure.
541 *
542 * Called by main module to notify the LL that the D channel connection has
543 * been established.
544 */
gigaset_isdn_connD(struct bc_state * bcs)545 void gigaset_isdn_connD(struct bc_state *bcs)
546 {
547 gig_dbg(DEBUG_CMD, "sending DCONN");
548 gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DCONN);
549 }
550
551 /**
552 * gigaset_isdn_hupD() - signal D channel hangup
553 * @bcs: B channel descriptor structure.
554 *
555 * Called by main module to notify the LL that the D channel connection has
556 * been shut down.
557 */
gigaset_isdn_hupD(struct bc_state * bcs)558 void gigaset_isdn_hupD(struct bc_state *bcs)
559 {
560 gig_dbg(DEBUG_CMD, "sending DHUP");
561 gigaset_i4l_channel_cmd(bcs, ISDN_STAT_DHUP);
562 }
563
564 /**
565 * gigaset_isdn_connB() - signal B channel connect
566 * @bcs: B channel descriptor structure.
567 *
568 * Called by main module to notify the LL that the B channel connection has
569 * been established.
570 */
gigaset_isdn_connB(struct bc_state * bcs)571 void gigaset_isdn_connB(struct bc_state *bcs)
572 {
573 gig_dbg(DEBUG_CMD, "sending BCONN");
574 gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BCONN);
575 }
576
577 /**
578 * gigaset_isdn_hupB() - signal B channel hangup
579 * @bcs: B channel descriptor structure.
580 *
581 * Called by main module to notify the LL that the B channel connection has
582 * been shut down.
583 */
gigaset_isdn_hupB(struct bc_state * bcs)584 void gigaset_isdn_hupB(struct bc_state *bcs)
585 {
586 gig_dbg(DEBUG_CMD, "sending BHUP");
587 gigaset_i4l_channel_cmd(bcs, ISDN_STAT_BHUP);
588 }
589
590 /**
591 * gigaset_isdn_start() - signal device availability
592 * @cs: device descriptor structure.
593 *
594 * Called by main module to notify the LL that the device is available for
595 * use.
596 */
gigaset_isdn_start(struct cardstate * cs)597 void gigaset_isdn_start(struct cardstate *cs)
598 {
599 gig_dbg(DEBUG_CMD, "sending RUN");
600 gigaset_i4l_cmd(cs, ISDN_STAT_RUN);
601 }
602
603 /**
604 * gigaset_isdn_stop() - signal device unavailability
605 * @cs: device descriptor structure.
606 *
607 * Called by main module to notify the LL that the device is no longer
608 * available for use.
609 */
gigaset_isdn_stop(struct cardstate * cs)610 void gigaset_isdn_stop(struct cardstate *cs)
611 {
612 gig_dbg(DEBUG_CMD, "sending STOP");
613 gigaset_i4l_cmd(cs, ISDN_STAT_STOP);
614 }
615
616 /**
617 * gigaset_isdn_regdev() - register to LL
618 * @cs: device descriptor structure.
619 * @isdnid: device name.
620 *
621 * Return value: 0 on success, error code < 0 on failure
622 */
gigaset_isdn_regdev(struct cardstate * cs,const char * isdnid)623 int gigaset_isdn_regdev(struct cardstate *cs, const char *isdnid)
624 {
625 isdn_if *iif;
626
627 iif = kmalloc(sizeof *iif, GFP_KERNEL);
628 if (!iif) {
629 pr_err("out of memory\n");
630 return -ENOMEM;
631 }
632
633 if (snprintf(iif->id, sizeof iif->id, "%s_%u", isdnid, cs->minor_index)
634 >= sizeof iif->id) {
635 pr_err("ID too long: %s\n", isdnid);
636 kfree(iif);
637 return -EINVAL;
638 }
639
640 iif->owner = THIS_MODULE;
641 iif->channels = cs->channels;
642 iif->maxbufsize = MAX_BUF_SIZE;
643 iif->features = ISDN_FEATURE_L2_TRANS |
644 ISDN_FEATURE_L2_HDLC |
645 ISDN_FEATURE_L2_X75I |
646 ISDN_FEATURE_L3_TRANS |
647 ISDN_FEATURE_P_EURO;
648 iif->hl_hdrlen = HW_HDR_LEN; /* Area for storing ack */
649 iif->command = command_from_LL;
650 iif->writebuf_skb = writebuf_from_LL;
651 iif->writecmd = NULL; /* Don't support isdnctrl */
652 iif->readstat = NULL; /* Don't support isdnctrl */
653 iif->rcvcallb_skb = NULL; /* Will be set by LL */
654 iif->statcallb = NULL; /* Will be set by LL */
655
656 if (!register_isdn(iif)) {
657 pr_err("register_isdn failed\n");
658 kfree(iif);
659 return -EINVAL;
660 }
661
662 cs->iif = iif;
663 cs->myid = iif->channels; /* Set my device id */
664 cs->hw_hdr_len = HW_HDR_LEN;
665 return 0;
666 }
667
668 /**
669 * gigaset_isdn_unregdev() - unregister device from LL
670 * @cs: device descriptor structure.
671 */
gigaset_isdn_unregdev(struct cardstate * cs)672 void gigaset_isdn_unregdev(struct cardstate *cs)
673 {
674 gig_dbg(DEBUG_CMD, "sending UNLOAD");
675 gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);
676 kfree(cs->iif);
677 cs->iif = NULL;
678 }
679
680 /**
681 * gigaset_isdn_regdrv() - register driver to LL
682 */
gigaset_isdn_regdrv(void)683 void gigaset_isdn_regdrv(void)
684 {
685 pr_info("ISDN4Linux interface\n");
686 /* nothing to do */
687 }
688
689 /**
690 * gigaset_isdn_unregdrv() - unregister driver from LL
691 */
gigaset_isdn_unregdrv(void)692 void gigaset_isdn_unregdrv(void)
693 {
694 /* nothing to do */
695 }
696