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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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>
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
21 static int handle_loop(struct cfctrl *ctrl,
22 int cmd, struct cfpkt *pkt){
26 static int handle_loop(struct cfctrl *ctrl,
27 int cmd, struct cfpkt *pkt);
29 static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
30 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
34 struct cflayer *cfctrl_create(void)
36 struct dev_info dev_info;
38 kmalloc(sizeof(struct cfctrl), GFP_ATOMIC);
40 pr_warn("Out of memory\n");
43 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
44 memset(&dev_info, 0, sizeof(dev_info));
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;
54 spin_lock_init(&this->loop_linkid_lock);
55 this->loop_linkid = 1;
57 spin_lock_init(&this->info_list_lock);
58 INIT_LIST_HEAD(&this->list);
59 return &this->serv.layer;
62 void cfctrl_remove(struct cflayer *layer)
64 struct cfctrl_request_info *p, *tmp;
65 struct cfctrl *ctrl = container_obj(layer);
67 spin_lock_bh(&ctrl->info_list_lock);
68 list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
72 spin_unlock_bh(&ctrl->info_list_lock);
76 static bool param_eq(const struct cfctrl_link_param *p1,
77 const struct cfctrl_link_param *p2)
80 p1->linktype == p2->linktype &&
81 p1->priority == p2->priority &&
82 p1->phyid == p2->phyid &&
83 p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
88 switch (p1->linktype) {
91 case CFCTRL_SRV_DATAGRAM:
92 return p1->u.datagram.connid == p2->u.datagram.connid;
95 p1->u.rfm.connid == p2->u.rfm.connid &&
96 strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
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;
107 case CFCTRL_SRV_VIDEO:
108 return p1->u.video.connid == p2->u.video.connid;
111 case CFCTRL_SRV_DECM:
119 static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
120 const struct cfctrl_request_info *r2)
122 if (r1->cmd != r2->cmd)
124 if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
125 return param_eq(&r1->param, &r2->param);
127 return r1->channel_id == r2->channel_id;
130 /* Insert request at the end */
131 static void cfctrl_insert_req(struct cfctrl *ctrl,
132 struct cfctrl_request_info *req)
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);
141 /* Compare and remove request */
142 static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
143 struct cfctrl_request_info *req)
145 struct cfctrl_request_info *p, *tmp, *first;
147 first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
149 list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
150 if (cfctrl_req_eq(req, p)) {
152 pr_warn("Requests are not received in order\n");
154 atomic_set(&ctrl->rsp_seq_no,
165 struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
167 struct cfctrl *this = container_obj(layer);
171 static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
174 info->channel_id = cfctrl->serv.layer.id;
175 info->dev_info = &cfctrl->serv.dev_info;
178 void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
180 struct cfctrl *cfctrl = container_obj(layer);
182 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
184 pr_warn("Out of memory\n");
187 caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
188 init_info(cfpkt_info(pkt), cfctrl);
189 cfpkt_info(pkt)->dev_info->id = physlinkid;
190 cfctrl->serv.dev_info.id = physlinkid;
191 cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
192 cfpkt_addbdy(pkt, physlinkid);
194 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
197 int cfctrl_linkup_request(struct cflayer *layer,
198 struct cfctrl_link_param *param,
199 struct cflayer *user_layer)
201 struct cfctrl *cfctrl = container_obj(layer);
205 struct cfctrl_request_info *req;
207 char utility_name[16];
210 if (cfctrl_cancel_req(layer, user_layer) > 0) {
211 /* Slight Paranoia, check if already connecting */
212 pr_err("Duplicate connect request for same client\n");
217 pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
219 pr_warn("Out of memory\n");
222 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
223 cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
224 cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
225 cfpkt_addbdy(pkt, param->endpoint & 0x03);
227 switch (param->linktype) {
230 case CFCTRL_SRV_VIDEO:
231 cfpkt_addbdy(pkt, (u8) param->u.video.connid);
235 case CFCTRL_SRV_DATAGRAM:
236 tmp32 = cpu_to_le32(param->u.datagram.connid);
237 cfpkt_add_body(pkt, &tmp32, 4);
240 /* Construct a frame, convert DatagramConnectionID to network
241 * format long and copy it out...
243 tmp32 = cpu_to_le32(param->u.rfm.connid);
244 cfpkt_add_body(pkt, &tmp32, 4);
245 /* Add volume name, including zero termination... */
246 cfpkt_add_body(pkt, param->u.rfm.volume,
247 strlen(param->u.rfm.volume) + 1);
249 case CFCTRL_SRV_UTIL:
250 tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
251 cfpkt_add_body(pkt, &tmp16, 2);
252 tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
253 cfpkt_add_body(pkt, &tmp16, 2);
254 memset(utility_name, 0, sizeof(utility_name));
255 strncpy(utility_name, param->u.utility.name,
256 UTILITY_NAME_LENGTH - 1);
257 cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
258 tmp8 = param->u.utility.paramlen;
259 cfpkt_add_body(pkt, &tmp8, 1);
260 cfpkt_add_body(pkt, param->u.utility.params,
261 param->u.utility.paramlen);
264 pr_warn("Request setup of bad link type = %d\n",
268 req = kzalloc(sizeof(*req), GFP_KERNEL);
270 pr_warn("Out of memory\n");
273 req->client_layer = user_layer;
274 req->cmd = CFCTRL_CMD_LINK_SETUP;
276 cfctrl_insert_req(cfctrl, req);
277 init_info(cfpkt_info(pkt), cfctrl);
279 * NOTE:Always send linkup and linkdown request on the same
280 * device as the payload. Otherwise old queued up payload
281 * might arrive with the newly allocated channel ID.
283 cfpkt_info(pkt)->dev_info->id = param->phyid;
285 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
289 count = cfctrl_cancel_req(&cfctrl->serv.layer,
292 pr_err("Could not remove request (%d)", count);
298 int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
299 struct cflayer *client)
302 struct cfctrl *cfctrl = container_obj(layer);
303 struct cfpkt *pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
305 pr_warn("Out of memory\n");
308 cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
309 cfpkt_addbdy(pkt, channelid);
310 init_info(cfpkt_info(pkt), cfctrl);
312 cfctrl->serv.layer.dn->transmit(cfctrl->serv.layer.dn, pkt);
314 cfctrl->loop_linkused[channelid] = 0;
319 int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
321 struct cfctrl_request_info *p, *tmp;
322 struct cfctrl *ctrl = container_obj(layr);
324 spin_lock_bh(&ctrl->info_list_lock);
326 list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
327 if (p->client_layer == adap_layer) {
334 spin_unlock_bh(&ctrl->info_list_lock);
338 static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
347 struct cfctrl *cfctrl = container_obj(layer);
348 struct cfctrl_request_info rsp, *req;
351 cfpkt_extr_head(pkt, &cmdrsp, 1);
352 cmd = cmdrsp & CFCTRL_CMD_MASK;
353 if (cmd != CFCTRL_CMD_LINK_ERR
354 && CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
355 if (handle_loop(cfctrl, cmd, pkt) != 0)
356 cmdrsp |= CFCTRL_ERR_BIT;
360 case CFCTRL_CMD_LINK_SETUP:
362 enum cfctrl_srv serv;
363 enum cfctrl_srv servtype;
371 struct cfctrl_link_param linkparam;
372 memset(&linkparam, 0, sizeof(linkparam));
374 cfpkt_extr_head(pkt, &tmp, 1);
376 serv = tmp & CFCTRL_SRV_MASK;
377 linkparam.linktype = serv;
380 linkparam.chtype = servtype;
382 cfpkt_extr_head(pkt, &tmp, 1);
383 physlinkid = tmp & 0x07;
386 linkparam.priority = prio;
387 linkparam.phyid = physlinkid;
388 cfpkt_extr_head(pkt, &endpoint, 1);
389 linkparam.endpoint = endpoint & 0x03;
394 if (CFCTRL_ERR_BIT & cmdrsp)
397 cfpkt_extr_head(pkt, &linkid, 1);
399 case CFCTRL_SRV_VIDEO:
400 cfpkt_extr_head(pkt, &tmp, 1);
401 linkparam.u.video.connid = tmp;
402 if (CFCTRL_ERR_BIT & cmdrsp)
405 cfpkt_extr_head(pkt, &linkid, 1);
408 case CFCTRL_SRV_DATAGRAM:
409 cfpkt_extr_head(pkt, &tmp32, 4);
410 linkparam.u.datagram.connid =
412 if (CFCTRL_ERR_BIT & cmdrsp)
415 cfpkt_extr_head(pkt, &linkid, 1);
418 /* Construct a frame, convert
419 * DatagramConnectionID
420 * to network format long and copy it out...
422 cfpkt_extr_head(pkt, &tmp32, 4);
423 linkparam.u.rfm.connid =
425 cp = (u8 *) linkparam.u.rfm.volume;
426 for (cfpkt_extr_head(pkt, &tmp, 1);
427 cfpkt_more(pkt) && tmp != '\0';
428 cfpkt_extr_head(pkt, &tmp, 1))
432 if (CFCTRL_ERR_BIT & cmdrsp)
435 cfpkt_extr_head(pkt, &linkid, 1);
438 case CFCTRL_SRV_UTIL:
439 /* Construct a frame, convert
440 * DatagramConnectionID
441 * to network format long and copy it out...
444 cfpkt_extr_head(pkt, &tmp16, 2);
445 linkparam.u.utility.fifosize_kb =
448 cfpkt_extr_head(pkt, &tmp16, 2);
449 linkparam.u.utility.fifosize_bufs =
452 cp = (u8 *) linkparam.u.utility.name;
453 caif_assert(sizeof(linkparam.u.utility.name)
454 >= UTILITY_NAME_LENGTH);
456 i < UTILITY_NAME_LENGTH
457 && cfpkt_more(pkt); i++) {
458 cfpkt_extr_head(pkt, &tmp, 1);
462 cfpkt_extr_head(pkt, &len, 1);
463 linkparam.u.utility.paramlen = len;
465 cp = linkparam.u.utility.params;
466 while (cfpkt_more(pkt) && len--) {
467 cfpkt_extr_head(pkt, &tmp, 1);
470 if (CFCTRL_ERR_BIT & cmdrsp)
473 cfpkt_extr_head(pkt, &linkid, 1);
475 cfpkt_extr_head(pkt, &len, 1);
477 cfpkt_extr_head(pkt, ¶m, len);
480 pr_warn("Request setup - invalid link type (%d)\n",
486 rsp.param = linkparam;
487 spin_lock_bh(&cfctrl->info_list_lock);
488 req = cfctrl_remove_req(cfctrl, &rsp);
490 if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
491 cfpkt_erroneous(pkt)) {
492 pr_err("Invalid O/E bit or parse error on CAIF control channel\n");
493 cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
495 req ? req->client_layer
498 cfctrl->res.linksetup_rsp(cfctrl->serv.
502 client_layer : NULL);
508 spin_unlock_bh(&cfctrl->info_list_lock);
511 case CFCTRL_CMD_LINK_DESTROY:
512 cfpkt_extr_head(pkt, &linkid, 1);
513 cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
515 case CFCTRL_CMD_LINK_ERR:
516 pr_err("Frame Error Indication received\n");
517 cfctrl->res.linkerror_ind();
519 case CFCTRL_CMD_ENUM:
520 cfctrl->res.enum_rsp();
522 case CFCTRL_CMD_SLEEP:
523 cfctrl->res.sleep_rsp();
525 case CFCTRL_CMD_WAKE:
526 cfctrl->res.wake_rsp();
528 case CFCTRL_CMD_LINK_RECONF:
529 cfctrl->res.restart_rsp();
531 case CFCTRL_CMD_RADIO_SET:
532 cfctrl->res.radioset_rsp();
535 pr_err("Unrecognized Control Frame\n");
545 static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
548 struct cfctrl *this = container_obj(layr);
550 case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
551 case CAIF_CTRLCMD_FLOW_OFF_IND:
552 spin_lock_bh(&this->info_list_lock);
553 if (!list_empty(&this->list)) {
554 pr_debug("Received flow off in control layer\n");
556 spin_unlock_bh(&this->info_list_lock);
558 case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
559 struct cfctrl_request_info *p, *tmp;
561 /* Find all connect request and report failure */
562 spin_lock_bh(&this->info_list_lock);
563 list_for_each_entry_safe(p, tmp, &this->list, list) {
564 if (p->param.phyid == phyid) {
566 p->client_layer->ctrlcmd(p->client_layer,
567 CAIF_CTRLCMD_INIT_FAIL_RSP,
572 spin_unlock_bh(&this->info_list_lock);
581 static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
583 static int last_linkid;
585 u8 linkid, linktype, tmp;
587 case CFCTRL_CMD_LINK_SETUP:
588 spin_lock_bh(&ctrl->loop_linkid_lock);
590 for (linkid = last_linkid + 1; linkid < 255; linkid++)
591 if (!ctrl->loop_linkused[linkid])
595 for (linkid = last_linkid - 1; linkid > 0; linkid--)
596 if (!ctrl->loop_linkused[linkid])
598 spin_unlock_bh(&ctrl->loop_linkid_lock);
604 if (!ctrl->loop_linkused[linkid])
605 ctrl->loop_linkused[linkid] = 1;
607 last_linkid = linkid;
609 cfpkt_add_trail(pkt, &linkid, 1);
610 spin_unlock_bh(&ctrl->loop_linkid_lock);
611 cfpkt_peek_head(pkt, &linktype, 1);
612 if (linktype == CFCTRL_SRV_UTIL) {
614 cfpkt_add_trail(pkt, &tmp, 1);
615 cfpkt_add_trail(pkt, &tmp, 1);
619 case CFCTRL_CMD_LINK_DESTROY:
620 spin_lock_bh(&ctrl->loop_linkid_lock);
621 cfpkt_peek_head(pkt, &linkid, 1);
622 ctrl->loop_linkused[linkid] = 0;
623 spin_unlock_bh(&ctrl->loop_linkid_lock);