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