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