642 lines
16 KiB
C
Executable File
642 lines
16 KiB
C
Executable File
/*
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* Copyright (C) ST-Ericsson AB 2010
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* Author: Sjur Brendeland
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/stddef.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/pkt_sched.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfpkt.h>
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#include <net/caif/cfctrl.h>
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#define container_obj(layr) container_of(layr, struct cfctrl, serv.layer)
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#define UTILITY_NAME_LENGTH 16
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#define CFPKT_CTRL_PKT_LEN 20
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#ifdef CAIF_NO_LOOP
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static int handle_loop(struct cfctrl *ctrl,
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int cmd, struct cfpkt *pkt){
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return -1;
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}
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#else
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static int handle_loop(struct cfctrl *ctrl,
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int cmd, struct cfpkt *pkt);
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#endif
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static int cfctrl_recv(struct cflayer *layr, struct cfpkt *pkt);
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static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
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int phyid);
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struct cflayer *cfctrl_create(void)
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{
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struct dev_info dev_info;
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struct cfctrl *this =
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kzalloc(sizeof(struct cfctrl), GFP_ATOMIC);
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if (!this)
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return NULL;
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caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
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memset(&dev_info, 0, sizeof(dev_info));
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dev_info.id = 0xff;
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cfsrvl_init(&this->serv, 0, &dev_info, false);
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atomic_set(&this->req_seq_no, 1);
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atomic_set(&this->rsp_seq_no, 1);
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this->serv.layer.receive = cfctrl_recv;
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sprintf(this->serv.layer.name, "ctrl");
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this->serv.layer.ctrlcmd = cfctrl_ctrlcmd;
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#ifndef CAIF_NO_LOOP
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spin_lock_init(&this->loop_linkid_lock);
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this->loop_linkid = 1;
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#endif
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spin_lock_init(&this->info_list_lock);
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INIT_LIST_HEAD(&this->list);
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return &this->serv.layer;
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}
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void cfctrl_remove(struct cflayer *layer)
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{
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struct cfctrl_request_info *p, *tmp;
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struct cfctrl *ctrl = container_obj(layer);
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spin_lock_bh(&ctrl->info_list_lock);
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list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
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list_del(&p->list);
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kfree(p);
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}
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spin_unlock_bh(&ctrl->info_list_lock);
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kfree(layer);
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}
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static bool param_eq(const struct cfctrl_link_param *p1,
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const struct cfctrl_link_param *p2)
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{
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bool eq =
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p1->linktype == p2->linktype &&
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p1->priority == p2->priority &&
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p1->phyid == p2->phyid &&
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p1->endpoint == p2->endpoint && p1->chtype == p2->chtype;
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if (!eq)
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return false;
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switch (p1->linktype) {
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case CFCTRL_SRV_VEI:
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return true;
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case CFCTRL_SRV_DATAGRAM:
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return p1->u.datagram.connid == p2->u.datagram.connid;
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case CFCTRL_SRV_RFM:
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return
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p1->u.rfm.connid == p2->u.rfm.connid &&
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strcmp(p1->u.rfm.volume, p2->u.rfm.volume) == 0;
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case CFCTRL_SRV_UTIL:
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return
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p1->u.utility.fifosize_kb == p2->u.utility.fifosize_kb
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&& p1->u.utility.fifosize_bufs ==
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p2->u.utility.fifosize_bufs
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&& strcmp(p1->u.utility.name, p2->u.utility.name) == 0
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&& p1->u.utility.paramlen == p2->u.utility.paramlen
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&& memcmp(p1->u.utility.params, p2->u.utility.params,
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p1->u.utility.paramlen) == 0;
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case CFCTRL_SRV_VIDEO:
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return p1->u.video.connid == p2->u.video.connid;
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case CFCTRL_SRV_DBG:
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return true;
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case CFCTRL_SRV_DECM:
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return false;
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default:
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return false;
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}
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return false;
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}
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static bool cfctrl_req_eq(const struct cfctrl_request_info *r1,
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const struct cfctrl_request_info *r2)
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{
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if (r1->cmd != r2->cmd)
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return false;
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if (r1->cmd == CFCTRL_CMD_LINK_SETUP)
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return param_eq(&r1->param, &r2->param);
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else
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return r1->channel_id == r2->channel_id;
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}
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/* Insert request at the end */
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static void cfctrl_insert_req(struct cfctrl *ctrl,
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struct cfctrl_request_info *req)
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{
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spin_lock_bh(&ctrl->info_list_lock);
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atomic_inc(&ctrl->req_seq_no);
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req->sequence_no = atomic_read(&ctrl->req_seq_no);
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list_add_tail(&req->list, &ctrl->list);
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spin_unlock_bh(&ctrl->info_list_lock);
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}
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/* Compare and remove request */
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static struct cfctrl_request_info *cfctrl_remove_req(struct cfctrl *ctrl,
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struct cfctrl_request_info *req)
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{
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struct cfctrl_request_info *p, *tmp, *first;
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first = list_first_entry(&ctrl->list, struct cfctrl_request_info, list);
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list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
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if (cfctrl_req_eq(req, p)) {
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if (p != first)
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pr_warn("Requests are not received in order\n");
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atomic_set(&ctrl->rsp_seq_no,
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p->sequence_no);
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list_del(&p->list);
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goto out;
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}
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}
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p = NULL;
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out:
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return p;
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}
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struct cfctrl_rsp *cfctrl_get_respfuncs(struct cflayer *layer)
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{
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struct cfctrl *this = container_obj(layer);
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return &this->res;
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}
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static void init_info(struct caif_payload_info *info, struct cfctrl *cfctrl)
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{
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info->hdr_len = 0;
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info->channel_id = cfctrl->serv.layer.id;
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info->dev_info = &cfctrl->serv.dev_info;
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}
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void cfctrl_enum_req(struct cflayer *layer, u8 physlinkid)
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{
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struct cfpkt *pkt;
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struct cfctrl *cfctrl = container_obj(layer);
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struct cflayer *dn = cfctrl->serv.layer.dn;
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if (!dn) {
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pr_debug("not able to send enum request\n");
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return;
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}
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pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
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if (!pkt)
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return;
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caif_assert(offsetof(struct cfctrl, serv.layer) == 0);
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init_info(cfpkt_info(pkt), cfctrl);
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cfpkt_info(pkt)->dev_info->id = physlinkid;
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cfctrl->serv.dev_info.id = physlinkid;
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cfpkt_addbdy(pkt, CFCTRL_CMD_ENUM);
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cfpkt_addbdy(pkt, physlinkid);
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cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
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dn->transmit(dn, pkt);
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}
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int cfctrl_linkup_request(struct cflayer *layer,
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struct cfctrl_link_param *param,
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struct cflayer *user_layer)
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{
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struct cfctrl *cfctrl = container_obj(layer);
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u32 tmp32;
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u16 tmp16;
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u8 tmp8;
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struct cfctrl_request_info *req;
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int ret;
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char utility_name[16];
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struct cfpkt *pkt;
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struct cflayer *dn = cfctrl->serv.layer.dn;
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if (!dn) {
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pr_debug("not able to send linkup request\n");
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return -ENODEV;
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}
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if (cfctrl_cancel_req(layer, user_layer) > 0) {
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/* Slight Paranoia, check if already connecting */
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pr_err("Duplicate connect request for same client\n");
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WARN_ON(1);
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return -EALREADY;
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}
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pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
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if (!pkt)
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return -ENOMEM;
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cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_SETUP);
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cfpkt_addbdy(pkt, (param->chtype << 4) | param->linktype);
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cfpkt_addbdy(pkt, (param->priority << 3) | param->phyid);
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cfpkt_addbdy(pkt, param->endpoint & 0x03);
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switch (param->linktype) {
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case CFCTRL_SRV_VEI:
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break;
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case CFCTRL_SRV_VIDEO:
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cfpkt_addbdy(pkt, (u8) param->u.video.connid);
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break;
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case CFCTRL_SRV_DBG:
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break;
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case CFCTRL_SRV_DATAGRAM:
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tmp32 = cpu_to_le32(param->u.datagram.connid);
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cfpkt_add_body(pkt, &tmp32, 4);
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break;
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case CFCTRL_SRV_RFM:
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/* Construct a frame, convert DatagramConnectionID to network
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* format long and copy it out...
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*/
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tmp32 = cpu_to_le32(param->u.rfm.connid);
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cfpkt_add_body(pkt, &tmp32, 4);
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/* Add volume name, including zero termination... */
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cfpkt_add_body(pkt, param->u.rfm.volume,
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strlen(param->u.rfm.volume) + 1);
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break;
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case CFCTRL_SRV_UTIL:
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tmp16 = cpu_to_le16(param->u.utility.fifosize_kb);
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cfpkt_add_body(pkt, &tmp16, 2);
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tmp16 = cpu_to_le16(param->u.utility.fifosize_bufs);
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cfpkt_add_body(pkt, &tmp16, 2);
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memset(utility_name, 0, sizeof(utility_name));
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strncpy(utility_name, param->u.utility.name,
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UTILITY_NAME_LENGTH - 1);
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cfpkt_add_body(pkt, utility_name, UTILITY_NAME_LENGTH);
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tmp8 = param->u.utility.paramlen;
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cfpkt_add_body(pkt, &tmp8, 1);
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cfpkt_add_body(pkt, param->u.utility.params,
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param->u.utility.paramlen);
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break;
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default:
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pr_warn("Request setup of bad link type = %d\n",
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param->linktype);
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return -EINVAL;
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}
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req = kzalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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req->client_layer = user_layer;
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req->cmd = CFCTRL_CMD_LINK_SETUP;
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req->param = *param;
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cfctrl_insert_req(cfctrl, req);
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init_info(cfpkt_info(pkt), cfctrl);
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/*
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* NOTE:Always send linkup and linkdown request on the same
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* device as the payload. Otherwise old queued up payload
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* might arrive with the newly allocated channel ID.
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*/
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cfpkt_info(pkt)->dev_info->id = param->phyid;
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cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
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ret =
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dn->transmit(dn, pkt);
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if (ret < 0) {
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int count;
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count = cfctrl_cancel_req(&cfctrl->serv.layer,
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user_layer);
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if (count != 1) {
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pr_err("Could not remove request (%d)", count);
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return -ENODEV;
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}
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}
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return 0;
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}
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int cfctrl_linkdown_req(struct cflayer *layer, u8 channelid,
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struct cflayer *client)
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{
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int ret;
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struct cfpkt *pkt;
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struct cfctrl *cfctrl = container_obj(layer);
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struct cflayer *dn = cfctrl->serv.layer.dn;
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if (!dn) {
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pr_debug("not able to send link-down request\n");
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return -ENODEV;
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}
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pkt = cfpkt_create(CFPKT_CTRL_PKT_LEN);
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if (!pkt)
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return -ENOMEM;
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cfpkt_addbdy(pkt, CFCTRL_CMD_LINK_DESTROY);
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cfpkt_addbdy(pkt, channelid);
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init_info(cfpkt_info(pkt), cfctrl);
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cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
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ret =
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dn->transmit(dn, pkt);
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#ifndef CAIF_NO_LOOP
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cfctrl->loop_linkused[channelid] = 0;
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#endif
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return ret;
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}
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int cfctrl_cancel_req(struct cflayer *layr, struct cflayer *adap_layer)
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{
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struct cfctrl_request_info *p, *tmp;
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struct cfctrl *ctrl = container_obj(layr);
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int found = 0;
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spin_lock_bh(&ctrl->info_list_lock);
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list_for_each_entry_safe(p, tmp, &ctrl->list, list) {
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if (p->client_layer == adap_layer) {
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list_del(&p->list);
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kfree(p);
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found++;
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}
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}
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spin_unlock_bh(&ctrl->info_list_lock);
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return found;
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}
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static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
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{
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u8 cmdrsp;
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u8 cmd;
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int ret = -1;
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u16 tmp16;
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u8 len;
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u8 param[255];
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u8 linkid;
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struct cfctrl *cfctrl = container_obj(layer);
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struct cfctrl_request_info rsp, *req;
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cfpkt_extr_head(pkt, &cmdrsp, 1);
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cmd = cmdrsp & CFCTRL_CMD_MASK;
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if (cmd != CFCTRL_CMD_LINK_ERR
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&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
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&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
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if (handle_loop(cfctrl, cmd, pkt) != 0)
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cmdrsp |= CFCTRL_ERR_BIT;
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}
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switch (cmd) {
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case CFCTRL_CMD_LINK_SETUP:
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{
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enum cfctrl_srv serv;
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enum cfctrl_srv servtype;
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u8 endpoint;
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u8 physlinkid;
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u8 prio;
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u8 tmp;
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u32 tmp32;
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u8 *cp;
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int i;
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struct cfctrl_link_param linkparam;
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memset(&linkparam, 0, sizeof(linkparam));
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cfpkt_extr_head(pkt, &tmp, 1);
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serv = tmp & CFCTRL_SRV_MASK;
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linkparam.linktype = serv;
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servtype = tmp >> 4;
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linkparam.chtype = servtype;
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cfpkt_extr_head(pkt, &tmp, 1);
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physlinkid = tmp & 0x07;
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prio = tmp >> 3;
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linkparam.priority = prio;
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linkparam.phyid = physlinkid;
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cfpkt_extr_head(pkt, &endpoint, 1);
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linkparam.endpoint = endpoint & 0x03;
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switch (serv) {
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case CFCTRL_SRV_VEI:
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case CFCTRL_SRV_DBG:
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if (CFCTRL_ERR_BIT & cmdrsp)
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break;
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/* Link ID */
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cfpkt_extr_head(pkt, &linkid, 1);
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break;
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case CFCTRL_SRV_VIDEO:
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cfpkt_extr_head(pkt, &tmp, 1);
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linkparam.u.video.connid = tmp;
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if (CFCTRL_ERR_BIT & cmdrsp)
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break;
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/* Link ID */
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cfpkt_extr_head(pkt, &linkid, 1);
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break;
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case CFCTRL_SRV_DATAGRAM:
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cfpkt_extr_head(pkt, &tmp32, 4);
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linkparam.u.datagram.connid =
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le32_to_cpu(tmp32);
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if (CFCTRL_ERR_BIT & cmdrsp)
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break;
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/* Link ID */
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cfpkt_extr_head(pkt, &linkid, 1);
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break;
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case CFCTRL_SRV_RFM:
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/* Construct a frame, convert
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* DatagramConnectionID
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* to network format long and copy it out...
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*/
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cfpkt_extr_head(pkt, &tmp32, 4);
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linkparam.u.rfm.connid =
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le32_to_cpu(tmp32);
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cp = (u8 *) linkparam.u.rfm.volume;
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for (cfpkt_extr_head(pkt, &tmp, 1);
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cfpkt_more(pkt) && tmp != '\0';
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cfpkt_extr_head(pkt, &tmp, 1))
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*cp++ = tmp;
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*cp = '\0';
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if (CFCTRL_ERR_BIT & cmdrsp)
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break;
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/* Link ID */
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cfpkt_extr_head(pkt, &linkid, 1);
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break;
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case CFCTRL_SRV_UTIL:
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/* Construct a frame, convert
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* DatagramConnectionID
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* to network format long and copy it out...
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*/
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/* Fifosize KB */
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cfpkt_extr_head(pkt, &tmp16, 2);
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linkparam.u.utility.fifosize_kb =
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le16_to_cpu(tmp16);
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/* Fifosize bufs */
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cfpkt_extr_head(pkt, &tmp16, 2);
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linkparam.u.utility.fifosize_bufs =
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le16_to_cpu(tmp16);
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/* name */
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cp = (u8 *) linkparam.u.utility.name;
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caif_assert(sizeof(linkparam.u.utility.name)
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>= UTILITY_NAME_LENGTH);
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for (i = 0;
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i < UTILITY_NAME_LENGTH
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&& cfpkt_more(pkt); i++) {
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cfpkt_extr_head(pkt, &tmp, 1);
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*cp++ = tmp;
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}
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/* Length */
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cfpkt_extr_head(pkt, &len, 1);
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linkparam.u.utility.paramlen = len;
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/* Param Data */
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cp = linkparam.u.utility.params;
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while (cfpkt_more(pkt) && len--) {
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cfpkt_extr_head(pkt, &tmp, 1);
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*cp++ = tmp;
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}
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if (CFCTRL_ERR_BIT & cmdrsp)
|
|
break;
|
|
/* Link ID */
|
|
cfpkt_extr_head(pkt, &linkid, 1);
|
|
/* Length */
|
|
cfpkt_extr_head(pkt, &len, 1);
|
|
/* Param Data */
|
|
cfpkt_extr_head(pkt, ¶m, len);
|
|
break;
|
|
default:
|
|
pr_warn("Request setup, invalid type (%d)\n",
|
|
serv);
|
|
goto error;
|
|
}
|
|
|
|
rsp.cmd = cmd;
|
|
rsp.param = linkparam;
|
|
spin_lock_bh(&cfctrl->info_list_lock);
|
|
req = cfctrl_remove_req(cfctrl, &rsp);
|
|
|
|
if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) ||
|
|
cfpkt_erroneous(pkt)) {
|
|
pr_err("Invalid O/E bit or parse error "
|
|
"on CAIF control channel\n");
|
|
cfctrl->res.reject_rsp(cfctrl->serv.layer.up,
|
|
0,
|
|
req ? req->client_layer
|
|
: NULL);
|
|
} else {
|
|
cfctrl->res.linksetup_rsp(cfctrl->serv.
|
|
layer.up, linkid,
|
|
serv, physlinkid,
|
|
req ? req->
|
|
client_layer : NULL);
|
|
}
|
|
|
|
kfree(req);
|
|
|
|
spin_unlock_bh(&cfctrl->info_list_lock);
|
|
}
|
|
break;
|
|
case CFCTRL_CMD_LINK_DESTROY:
|
|
cfpkt_extr_head(pkt, &linkid, 1);
|
|
cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid);
|
|
break;
|
|
case CFCTRL_CMD_LINK_ERR:
|
|
pr_err("Frame Error Indication received\n");
|
|
cfctrl->res.linkerror_ind();
|
|
break;
|
|
case CFCTRL_CMD_ENUM:
|
|
cfctrl->res.enum_rsp();
|
|
break;
|
|
case CFCTRL_CMD_SLEEP:
|
|
cfctrl->res.sleep_rsp();
|
|
break;
|
|
case CFCTRL_CMD_WAKE:
|
|
cfctrl->res.wake_rsp();
|
|
break;
|
|
case CFCTRL_CMD_LINK_RECONF:
|
|
cfctrl->res.restart_rsp();
|
|
break;
|
|
case CFCTRL_CMD_RADIO_SET:
|
|
cfctrl->res.radioset_rsp();
|
|
break;
|
|
default:
|
|
pr_err("Unrecognized Control Frame\n");
|
|
goto error;
|
|
}
|
|
ret = 0;
|
|
error:
|
|
cfpkt_destroy(pkt);
|
|
return ret;
|
|
}
|
|
|
|
static void cfctrl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
|
|
int phyid)
|
|
{
|
|
struct cfctrl *this = container_obj(layr);
|
|
switch (ctrl) {
|
|
case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
|
|
case CAIF_CTRLCMD_FLOW_OFF_IND:
|
|
spin_lock_bh(&this->info_list_lock);
|
|
if (!list_empty(&this->list))
|
|
pr_debug("Received flow off in control layer\n");
|
|
spin_unlock_bh(&this->info_list_lock);
|
|
break;
|
|
case _CAIF_CTRLCMD_PHYIF_DOWN_IND: {
|
|
struct cfctrl_request_info *p, *tmp;
|
|
|
|
/* Find all connect request and report failure */
|
|
spin_lock_bh(&this->info_list_lock);
|
|
list_for_each_entry_safe(p, tmp, &this->list, list) {
|
|
if (p->param.phyid == phyid) {
|
|
list_del(&p->list);
|
|
p->client_layer->ctrlcmd(p->client_layer,
|
|
CAIF_CTRLCMD_INIT_FAIL_RSP,
|
|
phyid);
|
|
kfree(p);
|
|
}
|
|
}
|
|
spin_unlock_bh(&this->info_list_lock);
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifndef CAIF_NO_LOOP
|
|
static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
|
|
{
|
|
static int last_linkid;
|
|
static int dec;
|
|
u8 linkid, linktype, tmp;
|
|
switch (cmd) {
|
|
case CFCTRL_CMD_LINK_SETUP:
|
|
spin_lock_bh(&ctrl->loop_linkid_lock);
|
|
if (!dec) {
|
|
for (linkid = last_linkid + 1; linkid < 254; linkid++)
|
|
if (!ctrl->loop_linkused[linkid])
|
|
goto found;
|
|
}
|
|
dec = 1;
|
|
for (linkid = last_linkid - 1; linkid > 1; linkid--)
|
|
if (!ctrl->loop_linkused[linkid])
|
|
goto found;
|
|
spin_unlock_bh(&ctrl->loop_linkid_lock);
|
|
return -1;
|
|
found:
|
|
if (linkid < 10)
|
|
dec = 0;
|
|
|
|
if (!ctrl->loop_linkused[linkid])
|
|
ctrl->loop_linkused[linkid] = 1;
|
|
|
|
last_linkid = linkid;
|
|
|
|
cfpkt_add_trail(pkt, &linkid, 1);
|
|
spin_unlock_bh(&ctrl->loop_linkid_lock);
|
|
cfpkt_peek_head(pkt, &linktype, 1);
|
|
if (linktype == CFCTRL_SRV_UTIL) {
|
|
tmp = 0x01;
|
|
cfpkt_add_trail(pkt, &tmp, 1);
|
|
cfpkt_add_trail(pkt, &tmp, 1);
|
|
}
|
|
break;
|
|
|
|
case CFCTRL_CMD_LINK_DESTROY:
|
|
spin_lock_bh(&ctrl->loop_linkid_lock);
|
|
cfpkt_peek_head(pkt, &linkid, 1);
|
|
ctrl->loop_linkused[linkid] = 0;
|
|
spin_unlock_bh(&ctrl->loop_linkid_lock);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|