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
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>
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
20 static int handle_loop(struct cfctrl *ctrl,
21 int cmd, struct cfpkt *pkt){
25 static int handle_loop(struct cfctrl *ctrl,
26 int cmd, struct cfpkt *pkt);
28 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
29 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
33 struct cflayer *cfctrl_create(void)
35 struct dev_info dev_info;
37 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
39 pr_warning("CAIF: %s(): Out of memory\n", __func__);
42 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
43 memset(&dev_info, 0, sizeof(dev_info));
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;
58 static bool param_eq(struct cfctrl_link_param *p1, struct cfctrl_link_param *p2)
61 p1->linktype == p2->linktype &&
62 p1->priority == p2->priority &&
63 p1->phyid == p2->phyid &&
64 p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
69 switch (p1->linktype) {
72 case CFCTRL_SRV_DATAGRAM:
73 return p1->u.datagram.connid == p2->u.datagram.connid;
76 p1->u.rfm.connid == p2->u.rfm.connid &&
77 strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
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;
88 case CFCTRL_SRV_VIDEO:
89 return p1->u.video.connid == p2->u.video.connid;
100 bool cfctrl_req_eq(struct cfctrl_request_info *r1,
101 struct cfctrl_request_info *r2)
103 if (r1->cmd != r2->cmd)
105 if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
106 return param_eq(&r1->param, &r2->param);
108 return r1->channel_id == r2->channel_id;
111 /* Insert request at the end */
112 void cfctrl_insert_req(struct cfctrl *ctrl,
113 struct cfctrl_request_info *req)
115 struct cfctrl_request_info *p;
116 spin_lock(&ctrl->info_list_lock);
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);
126 while (p->next != NULL)
129 spin_unlock(&ctrl->info_list_lock);
132 /* Compare and remove request */
133 struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
134 struct cfctrl_request_info *req)
136 struct cfctrl_request_info *p;
137 struct cfctrl_request_info *ret;
139 spin_lock(&ctrl->info_list_lock);
140 if (ctrl->first_req == NULL) {
141 spin_unlock(&ctrl->info_list_lock);
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);
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",
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);
171 spin_unlock(&ctrl->info_list_lock);
173 pr_warning("CAIF: %s(): Request does not match\n",
178 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
180 struct cfctrl *this = container_obj(layer);
184 void cfctrl_set_dnlayer(struct cflayer *this, struct cflayer *dn)
189 void cfctrl_set_uplayer(struct cflayer *this, struct cflayer *up)
194 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
197 info->channel_id = cfctrl->serv.layer.id;
198 info->dev_info = &cfctrl->serv.dev_info;
201 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
203 struct cfctrl *cfctrl = container_obj(layer);
205 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
207 pr_warning("CAIF: %s(): Out of memory\n", __func__);
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);
217 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
219 pr_err("CAIF: %s(): Could not transmit enum message\n",
225 int cfctrl_linkup_request(struct cflayer *layer,
226 struct cfctrl_link_param *param,
227 struct cflayer *user_layer)
229 struct cfctrl *cfctrl = container_obj(layer);
233 struct cfctrl_request_info *req;
235 char utility_name[16];
236 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
238 pr_warning("CAIF: %s(): Out of memory\n", __func__);
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);
246 switch (param->linktype) {
249 case CFCTRL_SRV_VIDEO:
250 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
254 case CFCTRL_SRV_DATAGRAM:
255 tmp32 = cpu_to_le32(param->u.datagram.connid);
256 cfpkt_add_body(pkt, &tmp32, 4);
259 /* Construct a frame, convert DatagramConnectionID to network
260 * format long and copy it out...
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);
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);
283 pr_warning("CAIF: %s():Request setup of bad link type = %d\n",
284 __func__, param->linktype);
287 req = kzalloc(sizeof(*req), GFP_KERNEL);
289 pr_warning("CAIF: %s(): Out of memory\n", __func__);
292 req->client_layer = user_layer;
293 req->cmd = CFCTRL_CMD_LINK_SETUP;
295 cfctrl_insert_req(cfctrl, req);
296 init_info(cfpkt_info(pkt), cfctrl);
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.
302 cfpkt_info(pkt)->dev_info->id = param->phyid;
304 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
306 pr_err("CAIF: %s(): Could not transmit linksetup request\n",
314 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
315 struct cflayer *client)
318 struct cfctrl *cfctrl = container_obj(layer);
319 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
321 pr_warning("CAIF: %s(): Out of memory\n", __func__);
324 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
325 cfpkt_addbdy(pkt, channelid);
326 init_info(cfpkt_info(pkt), cfctrl);
328 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
330 pr_err("CAIF: %s(): Could not transmit link-down request\n",
337 void cfctrl_sleep_req(struct cflayer *layer)
340 struct cfctrl *cfctrl = container_obj(layer);
341 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
343 pr_warning("CAIF: %s(): Out of memory\n", __func__);
346 cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
347 init_info(cfpkt_info(pkt), cfctrl);
349 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
354 void cfctrl_wake_req(struct cflayer *layer)
357 struct cfctrl *cfctrl = container_obj(layer);
358 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
360 pr_warning("CAIF: %s(): Out of memory\n", __func__);
363 cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
364 init_info(cfpkt_info(pkt), cfctrl);
366 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
371 void cfctrl_getstartreason_req(struct cflayer *layer)
374 struct cfctrl *cfctrl = container_obj(layer);
375 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
377 pr_warning("CAIF: %s(): Out of memory\n", __func__);
380 cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
381 init_info(cfpkt_info(pkt), cfctrl);
383 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
389 void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
391 struct cfctrl_request_info *p, *req;
392 struct cfctrl *ctrl = container_obj(layr);
393 spin_lock(&ctrl->info_list_lock);
395 if (ctrl->first_req == NULL) {
396 spin_unlock(&ctrl->info_list_lock);
400 if (ctrl->first_req->client_layer == adap_layer) {
402 req = ctrl->first_req;
403 ctrl->first_req = ctrl->first_req->next;
408 while (p != NULL && p->next != NULL) {
409 if (p->next->client_layer == adap_layer) {
412 p->next = p->next->next;
418 spin_unlock(&ctrl->info_list_lock);
421 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
430 struct cfctrl *cfctrl = container_obj(layer);
431 struct cfctrl_request_info rsp, *req;
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;
443 case CFCTRL_CMD_LINK_SETUP:
445 enum cfctrl_srv serv;
446 enum cfctrl_srv servtype;
454 struct cfctrl_link_param linkparam;
455 memset(&linkparam, 0, sizeof(linkparam));
457 cfpkt_extr_head(pkt, &tmp, 1);
459 serv = tmp & CFCTRL_SRV_MASK;
460 linkparam.linktype = serv;
463 linkparam.chtype = servtype;
465 cfpkt_extr_head(pkt, &tmp, 1);
466 physlinkid = tmp & 0x07;
469 linkparam.priority = prio;
470 linkparam.phyid = physlinkid;
471 cfpkt_extr_head(pkt, &endpoint, 1);
472 linkparam.endpoint = endpoint & 0x03;
477 if (CFCTRL_ERR_BIT & cmdrsp)
480 cfpkt_extr_head(pkt, &linkid, 1);
482 case CFCTRL_SRV_VIDEO:
483 cfpkt_extr_head(pkt, &tmp, 1);
484 linkparam.u.video.connid = tmp;
485 if (CFCTRL_ERR_BIT & cmdrsp)
488 cfpkt_extr_head(pkt, &linkid, 1);
491 case CFCTRL_SRV_DATAGRAM:
492 cfpkt_extr_head(pkt, &tmp32, 4);
493 linkparam.u.datagram.connid =
495 if (CFCTRL_ERR_BIT & cmdrsp)
498 cfpkt_extr_head(pkt, &linkid, 1);
501 /* Construct a frame, convert
502 * DatagramConnectionID
503 * to network format long and copy it out...
505 cfpkt_extr_head(pkt, &tmp32, 4);
506 linkparam.u.rfm.connid =
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))
515 if (CFCTRL_ERR_BIT & cmdrsp)
518 cfpkt_extr_head(pkt, &linkid, 1);
521 case CFCTRL_SRV_UTIL:
522 /* Construct a frame, convert
523 * DatagramConnectionID
524 * to network format long and copy it out...
527 cfpkt_extr_head(pkt, &tmp16, 2);
528 linkparam.u.utility.fifosize_kb =
531 cfpkt_extr_head(pkt, &tmp16, 2);
532 linkparam.u.utility.fifosize_bufs =
535 cp = (u8 *) linkparam.u.utility.name;
536 caif_assert(sizeof(linkparam.u.utility.name)
537 >= UTILITY_NAME_LENGTH);
539 i < UTILITY_NAME_LENGTH
540 && cfpkt_more(pkt); i++) {
541 cfpkt_extr_head(pkt, &tmp, 1);
545 cfpkt_extr_head(pkt, &len, 1);
546 linkparam.u.utility.paramlen = len;
548 cp = linkparam.u.utility.params;
549 while (cfpkt_more(pkt) && len--) {
550 cfpkt_extr_head(pkt, &tmp, 1);
553 if (CFCTRL_ERR_BIT & cmdrsp)
556 cfpkt_extr_head(pkt, &linkid, 1);
558 cfpkt_extr_head(pkt, &len, 1);
560 cfpkt_extr_head(pkt, ¶m, len);
563 pr_warning("CAIF: %s(): Request setup "
564 "- invalid link type (%d)",
570 rsp.param = linkparam;
571 req = cfctrl_remove_req(cfctrl, &rsp);
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",
578 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
580 req ? req->client_layer
583 cfctrl->res.linksetup_rsp(cfctrl->serv.
587 client_layer : NULL);
594 case CFCTRL_CMD_LINK_DESTROY:
595 cfpkt_extr_head(pkt, &linkid, 1);
596 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
598 case CFCTRL_CMD_LINK_ERR:
599 pr_err("CAIF: %s(): Frame Error Indication received\n",
601 cfctrl->res.linkerror_ind();
603 case CFCTRL_CMD_ENUM:
604 cfctrl->res.enum_rsp();
606 case CFCTRL_CMD_SLEEP:
607 cfctrl->res.sleep_rsp();
609 case CFCTRL_CMD_WAKE:
610 cfctrl->res.wake_rsp();
612 case CFCTRL_CMD_LINK_RECONF:
613 cfctrl->res.restart_rsp();
615 case CFCTRL_CMD_RADIO_SET:
616 cfctrl->res.radioset_rsp();
619 pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
629 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
632 struct cfctrl *this = container_obj(layr);
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__);
641 spin_unlock(&this->info_list_lock);
649 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
651 static int last_linkid;
652 u8 linkid, linktype, tmp;
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])
659 for (linkid = last_linkid - 1; linkid > 0; linkid--)
660 if (!ctrl->loop_linkused[linkid])
662 spin_unlock(&ctrl->loop_linkid_lock);
663 pr_err("CAIF: %s(): Out of link-ids\n", __func__);
666 if (!ctrl->loop_linkused[linkid])
667 ctrl->loop_linkused[linkid] = 1;
669 last_linkid = linkid;
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) {
676 cfpkt_add_trail(pkt, &tmp, 1);
677 cfpkt_add_trail(pkt, &tmp, 1);
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);