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