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-rw-r--r--net/caif/cfctrl.c692
1 files changed, 692 insertions, 0 deletions
diff --git a/net/caif/cfctrl.c b/net/caif/cfctrl.c
new file mode 100644
index 000000000000..0ffe1e1ce901
--- /dev/null
+++ b/net/caif/cfctrl.c
@@ -0,0 +1,692 @@
1/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland/sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/stddef.h>
8#include <linux/spinlock.h>
9#include <linux/slab.h>
10#include <net/caif/caif_layer.h>
11#include <net/caif/cfpkt.h>
12#include <net/caif/cfctrl.h>
13
14#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
15#define UTILITY_NAME_LENGTH 16
16#define CFPKT_CTRL_PKT_LEN 20
17
18
19#ifdef CAIF_NO_LOOP
20static int handle_loop(struct cfctrl *ctrl,
21 int cmd, struct cfpkt *pkt){
22 return CAIF_FAILURE;
23}
24#else
25static int handle_loop(struct cfctrl *ctrl,
26 int cmd, struct cfpkt *pkt);
27#endif
28static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
29static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
30 int phyid);
31
32
33struct cflayer *cfctrl_create(void)
34{
35 struct dev_info dev_info;
36 struct cfctrl *this =
37 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
38 if (!this) {
39 pr_warning("CAIF: %s(): Out of memory\n", __func__);
40 return NULL;
41 }
42 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
43 memset(&dev_info, 0, sizeof(dev_info));
44 dev_info.id = 0xff;
45 memset(this, 0, sizeof(*this));
46 cfsrvl_init(&this->serv, 0, &dev_info);
47 spin_lock_init(&this->info_list_lock);
48 atomic_set(&this->req_seq_no, 1);
49 atomic_set(&this->rsp_seq_no, 1);
50 this->serv.layer.receive = cfctrl_recv;
51 sprintf(this->serv.layer.name, "ctrl");
52 this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
53 spin_lock_init(&this->loop_linkid_lock);
54 this->loop_linkid = 1;
55 return &this->serv.layer;
56}
57
58static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
59{
60 bool eq =
61 p1->linktype == p2->linktype &&
62 p1->priority == p2->priority &&
63 p1->phyid == p2->phyid &&
64 p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
65
66 if (!eq)
67 return false;
68
69 switch (p1->linktype) {
70 case CFCTRL_SRV_VEI:
71 return true;
72 case CFCTRL_SRV_DATAGRAM:
73 return p1->u.datagram.connid == p2->u.datagram.connid;
74 case CFCTRL_SRV_RFM:
75 return
76 p1->u.rfm.connid == p2->u.rfm.connid &&
77 strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
78 case CFCTRL_SRV_UTIL:
79 return
80 p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
81 && p1->u.utility.fifosize_bufs ==
82 p2->u.utility.fifosize_bufs
83 && strcmp(p1->u.utility.name, p2->u.utility.name) == 0
84 && p1->u.utility.paramlen == p2->u.utility.paramlen
85 && memcmp(p1->u.utility.params, p2->u.utility.params,
86 p1->u.utility.paramlen) == 0;
87
88 case CFCTRL_SRV_VIDEO:
89 return p1->u.video.connid == p2->u.video.connid;
90 case CFCTRL_SRV_DBG:
91 return true;
92 case CFCTRL_SRV_DECM:
93 return false;
94 default:
95 return false;
96 }
97 return false;
98}
99
100bool cfctrl_req_eq(struct cfctrl_request_info *r1,
101 struct cfctrl_request_info *r2)
102{
103 if (r1->cmd != r2->cmd)
104 return false;
105 if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
106 return param_eq(&r1->param, &r2->param);
107 else
108 return r1->channel_id == r2->channel_id;
109}
110
111/* Insert request at the end */
112void cfctrl_insert_req(struct cfctrl *ctrl,
113 struct cfctrl_request_info *req)
114{
115 struct cfctrl_request_info *p;
116 spin_lock(&ctrl->info_list_lock);
117 req->next = NULL;
118 atomic_inc(&ctrl->req_seq_no);
119 req->sequence_no = atomic_read(&ctrl->req_seq_no);
120 if (ctrl->first_req == NULL) {
121 ctrl->first_req = req;
122 spin_unlock(&ctrl->info_list_lock);
123 return;
124 }
125 p = ctrl->first_req;
126 while (p->next != NULL)
127 p = p->next;
128 p->next = req;
129 spin_unlock(&ctrl->info_list_lock);
130}
131
132/* Compare and remove request */
133struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
134 struct cfctrl_request_info *req)
135{
136 struct cfctrl_request_info *p;
137 struct cfctrl_request_info *ret;
138
139 spin_lock(&ctrl->info_list_lock);
140 if (ctrl->first_req == NULL) {
141 spin_unlock(&ctrl->info_list_lock);
142 return NULL;
143 }
144
145 if (cfctrl_req_eq(req, ctrl->first_req)) {
146 ret = ctrl->first_req;
147 caif_assert(ctrl->first_req);
148 atomic_set(&ctrl->rsp_seq_no,
149 ctrl->first_req->sequence_no);
150 ctrl->first_req = ctrl->first_req->next;
151 spin_unlock(&ctrl->info_list_lock);
152 return ret;
153 }
154
155 p = ctrl->first_req;
156
157 while (p->next != NULL) {
158 if (cfctrl_req_eq(req, p->next)) {
159 pr_warning("CAIF: %s(): Requests are not "
160 "received in order\n",
161 __func__);
162 ret = p->next;
163 atomic_set(&ctrl->rsp_seq_no,
164 p->next->sequence_no);
165 p->next = p->next->next;
166 spin_unlock(&ctrl->info_list_lock);
167 return ret;
168 }
169 p = p->next;
170 }
171 spin_unlock(&ctrl->info_list_lock);
172
173 pr_warning("CAIF: %s(): Request does not match\n",
174 __func__);
175 return NULL;
176}
177
178struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
179{
180 struct cfctrl *this = container_obj(layer);
181 return &this->res;
182}
183
184void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
185{
186 this->dn = dn;
187}
188
189void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
190{
191 this->up = up;
192}
193
194static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
195{
196 info->hdr_len = 0;
197 info->channel_id = cfctrl->serv.layer.id;
198 info->dev_info = &cfctrl->serv.dev_info;
199}
200
201void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
202{
203 struct cfctrl *cfctrl = container_obj(layer);
204 int ret;
205 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
206 if (!pkt) {
207 pr_warning("CAIF: %s(): Out of memory\n", __func__);
208 return;
209 }
210 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
211 init_info(cfpkt_info(pkt), cfctrl);
212 cfpkt_info(pkt)->dev_info->id = physlinkid;
213 cfctrl->serv.dev_info.id = physlinkid;
214 cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
215 cfpkt_addbdy(pkt, physlinkid);
216 ret =
217 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
218 if (ret < 0) {
219 pr_err("CAIF: %s(): Could not transmit enum message\n",
220 __func__);
221 cfpkt_destroy(pkt);
222 }
223}
224
225int cfctrl_linkup_request(struct cflayer *layer,
226 struct cfctrl_link_param *param,
227 struct cflayer *user_layer)
228{
229 struct cfctrl *cfctrl = container_obj(layer);
230 u32 tmp32;
231 u16 tmp16;
232 u8 tmp8;
233 struct cfctrl_request_info *req;
234 int ret;
235 char utility_name[16];
236 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
237 if (!pkt) {
238 pr_warning("CAIF: %s(): Out of memory\n", __func__);
239 return -ENOMEM;
240 }
241 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
242 cfpkt_addbdy(pkt, (param->chtype << 4) + param->linktype);
243 cfpkt_addbdy(pkt, (param->priority << 3) + param->phyid);
244 cfpkt_addbdy(pkt, param->endpoint & 0x03);
245
246 switch (param->linktype) {
247 case CFCTRL_SRV_VEI:
248 break;
249 case CFCTRL_SRV_VIDEO:
250 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
251 break;
252 case CFCTRL_SRV_DBG:
253 break;
254 case CFCTRL_SRV_DATAGRAM:
255 tmp32 = cpu_to_le32(param->u.datagram.connid);
256 cfpkt_add_body(pkt, &tmp32, 4);
257 break;
258 case CFCTRL_SRV_RFM:
259 /* Construct a frame, convert DatagramConnectionID to network
260 * format long and copy it out...
261 */
262 tmp32 = cpu_to_le32(param->u.rfm.connid);
263 cfpkt_add_body(pkt, &tmp32, 4);
264 /* Add volume name, including zero termination... */
265 cfpkt_add_body(pkt, param->u.rfm.volume,
266 strlen(param->u.rfm.volume) + 1);
267 break;
268 case CFCTRL_SRV_UTIL:
269 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
270 cfpkt_add_body(pkt, &tmp16, 2);
271 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
272 cfpkt_add_body(pkt, &tmp16, 2);
273 memset(utility_name, 0, sizeof(utility_name));
274 strncpy(utility_name, param->u.utility.name,
275 UTILITY_NAME_LENGTH - 1);
276 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
277 tmp8 = param->u.utility.paramlen;
278 cfpkt_add_body(pkt, &tmp8, 1);
279 cfpkt_add_body(pkt, param->u.utility.params,
280 param->u.utility.paramlen);
281 break;
282 default:
283 pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
284 __func__, param->linktype);
285 return -EINVAL;
286 }
287 req = kzalloc(sizeof(*req), GFP_KERNEL);
288 if (!req) {
289 pr_warning("CAIF: %s(): Out of memory\n", __func__);
290 return -ENOMEM;
291 }
292 req->client_layer = user_layer;
293 req->cmd = CFCTRL_CMD_LINK_SETUP;
294 req->param = *param;
295 cfctrl_insert_req(cfctrl, req);
296 init_info(cfpkt_info(pkt), cfctrl);
297 /*
298 * NOTE:Always send linkup and linkdown request on the same
299 * device as the payload. Otherwise old queued up payload
300 * might arrive with the newly allocated channel ID.
301 */
302 cfpkt_info(pkt)->dev_info->id = param->phyid;
303 ret =
304 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
305 if (ret < 0) {
306 pr_err("CAIF: %s(): Could not transmit linksetup request\n",
307 __func__);
308 cfpkt_destroy(pkt);
309 return -ENODEV;
310 }
311 return 0;
312}
313
314int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
315 struct cflayer *client)
316{
317 int ret;
318 struct cfctrl *cfctrl = container_obj(layer);
319 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
320 if (!pkt) {
321 pr_warning("CAIF: %s(): Out of memory\n", __func__);
322 return -ENOMEM;
323 }
324 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
325 cfpkt_addbdy(pkt, channelid);
326 init_info(cfpkt_info(pkt), cfctrl);
327 ret =
328 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
329 if (ret < 0) {
330 pr_err("CAIF: %s(): Could not transmit link-down request\n",
331 __func__);
332 cfpkt_destroy(pkt);
333 }
334 return ret;
335}
336
337void cfctrl_sleep_req(struct cflayer *layer)
338{
339 int ret;
340 struct cfctrl *cfctrl = container_obj(layer);
341 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
342 if (!pkt) {
343 pr_warning("CAIF: %s(): Out of memory\n", __func__);
344 return;
345 }
346 cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
347 init_info(cfpkt_info(pkt), cfctrl);
348 ret =
349 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
350 if (ret < 0)
351 cfpkt_destroy(pkt);
352}
353
354void cfctrl_wake_req(struct cflayer *layer)
355{
356 int ret;
357 struct cfctrl *cfctrl = container_obj(layer);
358 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
359 if (!pkt) {
360 pr_warning("CAIF: %s(): Out of memory\n", __func__);
361 return;
362 }
363 cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
364 init_info(cfpkt_info(pkt), cfctrl);
365 ret =
366 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
367 if (ret < 0)
368 cfpkt_destroy(pkt);
369}
370
371void cfctrl_getstartreason_req(struct cflayer *layer)
372{
373 int ret;
374 struct cfctrl *cfctrl = container_obj(layer);
375 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
376 if (!pkt) {
377 pr_warning("CAIF: %s(): Out of memory\n", __func__);
378 return;
379 }
380 cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
381 init_info(cfpkt_info(pkt), cfctrl);
382 ret =
383 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
384 if (ret < 0)
385 cfpkt_destroy(pkt);
386}
387
388
389void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
390{
391 struct cfctrl_request_info *p, *req;
392 struct cfctrl *ctrl = container_obj(layr);
393 spin_lock(&ctrl->info_list_lock);
394
395 if (ctrl->first_req == NULL) {
396 spin_unlock(&ctrl->info_list_lock);
397 return;
398 }
399
400 if (ctrl->first_req->client_layer == adap_layer) {
401
402 req = ctrl->first_req;
403 ctrl->first_req = ctrl->first_req->next;
404 kfree(req);
405 }
406
407 p = ctrl->first_req;
408 while (p != NULL && p->next != NULL) {
409 if (p->next->client_layer == adap_layer) {
410
411 req = p->next;
412 p->next = p->next->next;
413 kfree(p->next);
414 }
415 p = p->next;
416 }
417
418 spin_unlock(&ctrl->info_list_lock);
419}
420
421static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
422{
423 u8 cmdrsp;
424 u8 cmd;
425 int ret = -1;
426 u16 tmp16;
427 u8 len;
428 u8 param[255];
429 u8 linkid;
430 struct cfctrl *cfctrl = container_obj(layer);
431 struct cfctrl_request_info rsp, *req;
432
433
434 cfpkt_extr_head(pkt, &cmdrsp, 1);
435 cmd = cmdrsp & CFCTRL_CMD_MASK;
436 if (cmd != CFCTRL_CMD_LINK_ERR
437 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
438 if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
439 cmdrsp |= CFCTRL_ERR_BIT;
440 }
441
442 switch (cmd) {
443 case CFCTRL_CMD_LINK_SETUP:
444 {
445 enum cfctrl_srv serv;
446 enum cfctrl_srv servtype;
447 u8 endpoint;
448 u8 physlinkid;
449 u8 prio;
450 u8 tmp;
451 u32 tmp32;
452 u8 *cp;
453 int i;
454 struct cfctrl_link_param linkparam;
455 memset(&linkparam, 0, sizeof(linkparam));
456
457 cfpkt_extr_head(pkt, &tmp, 1);
458
459 serv = tmp & CFCTRL_SRV_MASK;
460 linkparam.linktype = serv;
461
462 servtype = tmp >> 4;
463 linkparam.chtype = servtype;
464
465 cfpkt_extr_head(pkt, &tmp, 1);
466 physlinkid = tmp & 0x07;
467 prio = tmp >> 3;
468
469 linkparam.priority = prio;
470 linkparam.phyid = physlinkid;
471 cfpkt_extr_head(pkt, &endpoint, 1);
472 linkparam.endpoint = endpoint & 0x03;
473
474 switch (serv) {
475 case CFCTRL_SRV_VEI:
476 case CFCTRL_SRV_DBG:
477 if (CFCTRL_ERR_BIT & cmdrsp)
478 break;
479 /* Link ID */
480 cfpkt_extr_head(pkt, &linkid, 1);
481 break;
482 case CFCTRL_SRV_VIDEO:
483 cfpkt_extr_head(pkt, &tmp, 1);
484 linkparam.u.video.connid = tmp;
485 if (CFCTRL_ERR_BIT & cmdrsp)
486 break;
487 /* Link ID */
488 cfpkt_extr_head(pkt, &linkid, 1);
489 break;
490
491 case CFCTRL_SRV_DATAGRAM:
492 cfpkt_extr_head(pkt, &tmp32, 4);
493 linkparam.u.datagram.connid =
494 le32_to_cpu(tmp32);
495 if (CFCTRL_ERR_BIT & cmdrsp)
496 break;
497 /* Link ID */
498 cfpkt_extr_head(pkt, &linkid, 1);
499 break;
500 case CFCTRL_SRV_RFM:
501 /* Construct a frame, convert
502 * DatagramConnectionID
503 * to network format long and copy it out...
504 */
505 cfpkt_extr_head(pkt, &tmp32, 4);
506 linkparam.u.rfm.connid =
507 le32_to_cpu(tmp32);
508 cp = (u8 *) linkparam.u.rfm.volume;
509 for (cfpkt_extr_head(pkt, &tmp, 1);
510 cfpkt_more(pkt) && tmp != '\0';
511 cfpkt_extr_head(pkt, &tmp, 1))
512 *cp++ = tmp;
513 *cp = '\0';
514
515 if (CFCTRL_ERR_BIT & cmdrsp)
516 break;
517 /* Link ID */
518 cfpkt_extr_head(pkt, &linkid, 1);
519
520 break;
521 case CFCTRL_SRV_UTIL:
522 /* Construct a frame, convert
523 * DatagramConnectionID
524 * to network format long and copy it out...
525 */
526 /* Fifosize KB */
527 cfpkt_extr_head(pkt, &tmp16, 2);
528 linkparam.u.utility.fifosize_kb =
529 le16_to_cpu(tmp16);
530 /* Fifosize bufs */
531 cfpkt_extr_head(pkt, &tmp16, 2);
532 linkparam.u.utility.fifosize_bufs =
533 le16_to_cpu(tmp16);
534 /* name */
535 cp = (u8 *) linkparam.u.utility.name;
536 caif_assert(sizeof(linkparam.u.utility.name)
537 >= UTILITY_NAME_LENGTH);
538 for (i = 0;
539 i < UTILITY_NAME_LENGTH
540 && cfpkt_more(pkt); i++) {
541 cfpkt_extr_head(pkt, &tmp, 1);
542 *cp++ = tmp;
543 }
544 /* Length */
545 cfpkt_extr_head(pkt, &len, 1);
546 linkparam.u.utility.paramlen = len;
547 /* Param Data */
548 cp = linkparam.u.utility.params;
549 while (cfpkt_more(pkt) && len--) {
550 cfpkt_extr_head(pkt, &tmp, 1);
551 *cp++ = tmp;
552 }
553 if (CFCTRL_ERR_BIT & cmdrsp)
554 break;
555 /* Link ID */
556 cfpkt_extr_head(pkt, &linkid, 1);
557 /* Length */
558 cfpkt_extr_head(pkt, &len, 1);
559 /* Param Data */
560 cfpkt_extr_head(pkt, &param, len);
561 break;
562 default:
563 pr_warning("CAIF: %s(): Request setup "
564 "- invalid link type (%d)",
565 __func__, serv);
566 goto error;
567 }
568
569 rsp.cmd = cmd;
570 rsp.param = linkparam;
571 req = cfctrl_remove_req(cfctrl, &rsp);
572
573 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
574 cfpkt_erroneous(pkt)) {
575 pr_err("CAIF: %s(): Invalid O/E bit or parse "
576 "error on CAIF control channel",
577 __func__);
578 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
579 0,
580 req ? req->client_layer
581 : NULL);
582 } else {
583 cfctrl->res.linksetup_rsp(cfctrl->serv.
584 layer.up, linkid,
585 serv, physlinkid,
586 req ? req->
587 client_layer : NULL);
588 }
589
590 if (req != NULL)
591 kfree(req);
592 }
593 break;
594 case CFCTRL_CMD_LINK_DESTROY:
595 cfpkt_extr_head(pkt, &linkid, 1);
596 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
597 break;
598 case CFCTRL_CMD_LINK_ERR:
599 pr_err("CAIF: %s(): Frame Error Indication received\n",
600 __func__);
601 cfctrl->res.linkerror_ind();
602 break;
603 case CFCTRL_CMD_ENUM:
604 cfctrl->res.enum_rsp();
605 break;
606 case CFCTRL_CMD_SLEEP:
607 cfctrl->res.sleep_rsp();
608 break;
609 case CFCTRL_CMD_WAKE:
610 cfctrl->res.wake_rsp();
611 break;
612 case CFCTRL_CMD_LINK_RECONF:
613 cfctrl->res.restart_rsp();
614 break;
615 case CFCTRL_CMD_RADIO_SET:
616 cfctrl->res.radioset_rsp();
617 break;
618 default:
619 pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
620 goto error;
621 break;
622 }
623 ret = 0;
624error:
625 cfpkt_destroy(pkt);
626 return ret;
627}
628
629static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
630 int phyid)
631{
632 struct cfctrl *this = container_obj(layr);
633 switch (ctrl) {
634 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
635 case CAIF_CTRLCMD_FLOW_OFF_IND:
636 spin_lock(&this->info_list_lock);
637 if (this->first_req != NULL) {
638 pr_debug("CAIF: %s(): Received flow off in "
639 "control layer", __func__);
640 }
641 spin_unlock(&this->info_list_lock);
642 break;
643 default:
644 break;
645 }
646}
647
648#ifndef CAIF_NO_LOOP
649static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
650{
651 static int last_linkid;
652 u8 linkid, linktype, tmp;
653 switch (cmd) {
654 case CFCTRL_CMD_LINK_SETUP:
655 spin_lock(&ctrl->loop_linkid_lock);
656 for (linkid = last_linkid + 1; linkid < 255; linkid++)
657 if (!ctrl->loop_linkused[linkid])
658 goto found;
659 for (linkid = last_linkid - 1; linkid > 0; linkid--)
660 if (!ctrl->loop_linkused[linkid])
661 goto found;
662 spin_unlock(&ctrl->loop_linkid_lock);
663 pr_err("CAIF: %s(): Out of link-ids\n", __func__);
664 return -EINVAL;
665found:
666 if (!ctrl->loop_linkused[linkid])
667 ctrl->loop_linkused[linkid] = 1;
668
669 last_linkid = linkid;
670
671 cfpkt_add_trail(pkt, &linkid, 1);
672 spin_unlock(&ctrl->loop_linkid_lock);
673 cfpkt_peek_head(pkt, &linktype, 1);
674 if (linktype == CFCTRL_SRV_UTIL) {
675 tmp = 0x01;
676 cfpkt_add_trail(pkt, &tmp, 1);
677 cfpkt_add_trail(pkt, &tmp, 1);
678 }
679 break;
680
681 case CFCTRL_CMD_LINK_DESTROY:
682 spin_lock(&ctrl->loop_linkid_lock);
683 cfpkt_peek_head(pkt, &linkid, 1);
684 ctrl->loop_linkused[linkid] = 0;
685 spin_unlock(&ctrl->loop_linkid_lock);
686 break;
687 default:
688 break;
689 }
690 return CAIF_SUCCESS;
691}
692#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-29 08:29:34 -0500