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 = kmalloc(sizeof(*req), GFP_KERNEL);
289 pr_warning("CAIF: %s(): Out of memory\n", __func__);
292 memset(req, 0, sizeof(*req));
293 req->client_layer = user_layer;
294 req->cmd = CFCTRL_CMD_LINK_SETUP;
296 cfctrl_insert_req(cfctrl, req);
297 init_info(cfpkt_info(pkt), cfctrl);
299 * NOTE:Always send linkup and linkdown request on the same
300 * device as the payload. Otherwise old queued up payload
301 * might arrive with the newly allocated channel ID.
303 cfpkt_info(pkt)->dev_info->id = param->phyid;
305 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
307 pr_err("CAIF: %s(): Could not transmit linksetup request\n",
315 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
316 struct cflayer *client)
319 struct cfctrl *cfctrl = container_obj(layer);
320 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
322 pr_warning("CAIF: %s(): Out of memory\n", __func__);
325 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
326 cfpkt_addbdy(pkt, channelid);
327 init_info(cfpkt_info(pkt), cfctrl);
329 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
331 pr_err("CAIF: %s(): Could not transmit link-down request\n",
338 void cfctrl_sleep_req(struct cflayer *layer)
341 struct cfctrl *cfctrl = container_obj(layer);
342 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
344 pr_warning("CAIF: %s(): Out of memory\n", __func__);
347 cfpkt_addbdy(pkt, CFCTRL_CMD_SLEEP);
348 init_info(cfpkt_info(pkt), cfctrl);
350 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
355 void cfctrl_wake_req(struct cflayer *layer)
358 struct cfctrl *cfctrl = container_obj(layer);
359 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
361 pr_warning("CAIF: %s(): Out of memory\n", __func__);
364 cfpkt_addbdy(pkt, CFCTRL_CMD_WAKE);
365 init_info(cfpkt_info(pkt), cfctrl);
367 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
372 void cfctrl_getstartreason_req(struct cflayer *layer)
375 struct cfctrl *cfctrl = container_obj(layer);
376 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
378 pr_warning("CAIF: %s(): Out of memory\n", __func__);
381 cfpkt_addbdy(pkt, CFCTRL_CMD_START_REASON);
382 init_info(cfpkt_info(pkt), cfctrl);
384 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
390 void cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
392 struct cfctrl_request_info *p, *req;
393 struct cfctrl *ctrl = container_obj(layr);
394 spin_lock(&ctrl->info_list_lock);
396 if (ctrl->first_req == NULL) {
397 spin_unlock(&ctrl->info_list_lock);
401 if (ctrl->first_req->client_layer == adap_layer) {
403 req = ctrl->first_req;
404 ctrl->first_req = ctrl->first_req->next;
409 while (p != NULL && p->next != NULL) {
410 if (p->next->client_layer == adap_layer) {
413 p->next = p->next->next;
419 spin_unlock(&ctrl->info_list_lock);
422 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
431 struct cfctrl *cfctrl = container_obj(layer);
432 struct cfctrl_request_info rsp, *req;
435 cfpkt_extr_head(pkt, &cmdrsp, 1);
436 cmd = cmdrsp & CFCTRL_CMD_MASK;
437 if (cmd != CFCTRL_CMD_LINK_ERR
438 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
439 if (handle_loop(cfctrl, cmd, pkt) == CAIF_FAILURE)
440 cmdrsp |= CFCTRL_ERR_BIT;
444 case CFCTRL_CMD_LINK_SETUP:
446 enum cfctrl_srv serv;
447 enum cfctrl_srv servtype;
455 struct cfctrl_link_param linkparam;
456 memset(&linkparam, 0, sizeof(linkparam));
458 cfpkt_extr_head(pkt, &tmp, 1);
460 serv = tmp & CFCTRL_SRV_MASK;
461 linkparam.linktype = serv;
464 linkparam.chtype = servtype;
466 cfpkt_extr_head(pkt, &tmp, 1);
467 physlinkid = tmp & 0x07;
470 linkparam.priority = prio;
471 linkparam.phyid = physlinkid;
472 cfpkt_extr_head(pkt, &endpoint, 1);
473 linkparam.endpoint = endpoint & 0x03;
478 if (CFCTRL_ERR_BIT & cmdrsp)
481 cfpkt_extr_head(pkt, &linkid, 1);
483 case CFCTRL_SRV_VIDEO:
484 cfpkt_extr_head(pkt, &tmp, 1);
485 linkparam.u.video.connid = tmp;
486 if (CFCTRL_ERR_BIT & cmdrsp)
489 cfpkt_extr_head(pkt, &linkid, 1);
492 case CFCTRL_SRV_DATAGRAM:
493 cfpkt_extr_head(pkt, &tmp32, 4);
494 linkparam.u.datagram.connid =
496 if (CFCTRL_ERR_BIT & cmdrsp)
499 cfpkt_extr_head(pkt, &linkid, 1);
502 /* Construct a frame, convert
503 * DatagramConnectionID
504 * to network format long and copy it out...
506 cfpkt_extr_head(pkt, &tmp32, 4);
507 linkparam.u.rfm.connid =
509 cp = (u8 *) linkparam.u.rfm.volume;
510 for (cfpkt_extr_head(pkt, &tmp, 1);
511 cfpkt_more(pkt) && tmp != '\0';
512 cfpkt_extr_head(pkt, &tmp, 1))
516 if (CFCTRL_ERR_BIT & cmdrsp)
519 cfpkt_extr_head(pkt, &linkid, 1);
522 case CFCTRL_SRV_UTIL:
523 /* Construct a frame, convert
524 * DatagramConnectionID
525 * to network format long and copy it out...
528 cfpkt_extr_head(pkt, &tmp16, 2);
529 linkparam.u.utility.fifosize_kb =
532 cfpkt_extr_head(pkt, &tmp16, 2);
533 linkparam.u.utility.fifosize_bufs =
536 cp = (u8 *) linkparam.u.utility.name;
537 caif_assert(sizeof(linkparam.u.utility.name)
538 >= UTILITY_NAME_LENGTH);
540 i < UTILITY_NAME_LENGTH
541 && cfpkt_more(pkt); i++) {
542 cfpkt_extr_head(pkt, &tmp, 1);
546 cfpkt_extr_head(pkt, &len, 1);
547 linkparam.u.utility.paramlen = len;
549 cp = linkparam.u.utility.params;
550 while (cfpkt_more(pkt) && len--) {
551 cfpkt_extr_head(pkt, &tmp, 1);
554 if (CFCTRL_ERR_BIT & cmdrsp)
557 cfpkt_extr_head(pkt, &linkid, 1);
559 cfpkt_extr_head(pkt, &len, 1);
561 cfpkt_extr_head(pkt, ¶m, len);
564 pr_warning("CAIF: %s(): Request setup "
565 "- invalid link type (%d)",
571 rsp.param = linkparam;
572 req = cfctrl_remove_req(cfctrl, &rsp);
574 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
575 cfpkt_erroneous(pkt)) {
576 pr_err("CAIF: %s(): Invalid O/E bit or parse "
577 "error on CAIF control channel",
579 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
581 req ? req->client_layer
584 cfctrl->res.linksetup_rsp(cfctrl->serv.
588 client_layer : NULL);
595 case CFCTRL_CMD_LINK_DESTROY:
596 cfpkt_extr_head(pkt, &linkid, 1);
597 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
599 case CFCTRL_CMD_LINK_ERR:
600 pr_err("CAIF: %s(): Frame Error Indication received\n",
602 cfctrl->res.linkerror_ind();
604 case CFCTRL_CMD_ENUM:
605 cfctrl->res.enum_rsp();
607 case CFCTRL_CMD_SLEEP:
608 cfctrl->res.sleep_rsp();
610 case CFCTRL_CMD_WAKE:
611 cfctrl->res.wake_rsp();
613 case CFCTRL_CMD_LINK_RECONF:
614 cfctrl->res.restart_rsp();
616 case CFCTRL_CMD_RADIO_SET:
617 cfctrl->res.radioset_rsp();
620 pr_err("CAIF: %s(): Unrecognized Control Frame\n", __func__);
630 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
633 struct cfctrl *this = container_obj(layr);
635 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
636 case CAIF_CTRLCMD_FLOW_OFF_IND:
637 spin_lock(&this->info_list_lock);
638 if (this->first_req != NULL) {
639 pr_debug("CAIF: %s(): Received flow off in "
640 "control layer", __func__);
642 spin_unlock(&this->info_list_lock);
650 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
652 static int last_linkid;
653 u8 linkid, linktype, tmp;
655 case CFCTRL_CMD_LINK_SETUP:
656 spin_lock(&ctrl->loop_linkid_lock);
657 for (linkid = last_linkid + 1; linkid < 255; linkid++)
658 if (!ctrl->loop_linkused[linkid])
660 for (linkid = last_linkid - 1; linkid > 0; linkid--)
661 if (!ctrl->loop_linkused[linkid])
663 spin_unlock(&ctrl->loop_linkid_lock);
664 pr_err("CAIF: %s(): Out of link-ids\n", __func__);
667 if (!ctrl->loop_linkused[linkid])
668 ctrl->loop_linkused[linkid] = 1;
670 last_linkid = linkid;
672 cfpkt_add_trail(pkt, &linkid, 1);
673 spin_unlock(&ctrl->loop_linkid_lock);
674 cfpkt_peek_head(pkt, &linktype, 1);
675 if (linktype == CFCTRL_SRV_UTIL) {
677 cfpkt_add_trail(pkt, &tmp, 1);
678 cfpkt_add_trail(pkt, &tmp, 1);
682 case CFCTRL_CMD_LINK_DESTROY:
683 spin_lock(&ctrl->loop_linkid_lock);
684 cfpkt_peek_head(pkt, &linkid, 1);
685 ctrl->loop_linkused[linkid] = 0;
686 spin_unlock(&ctrl->loop_linkid_lock);