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635 lines
16 KiB
635 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson AB 2010 |
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* Author: Sjur Brendeland |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__ |
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|
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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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strlcpy(utility_name, param->u.utility.name, |
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UTILITY_NAME_LENGTH); |
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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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u8 len; |
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u8 param[255]; |
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u8 linkid = 0; |
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struct cfctrl *cfctrl = container_obj(layer); |
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struct cfctrl_request_info rsp, *req; |
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cmdrsp = cfpkt_extr_head_u8(pkt); |
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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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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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tmp = cfpkt_extr_head_u8(pkt); |
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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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tmp = cfpkt_extr_head_u8(pkt); |
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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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endpoint = cfpkt_extr_head_u8(pkt); |
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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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linkid = cfpkt_extr_head_u8(pkt); |
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break; |
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case CFCTRL_SRV_VIDEO: |
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tmp = cfpkt_extr_head_u8(pkt); |
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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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linkid = cfpkt_extr_head_u8(pkt); |
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break; |
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case CFCTRL_SRV_DATAGRAM: |
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linkparam.u.datagram.connid = |
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cfpkt_extr_head_u32(pkt); |
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if (CFCTRL_ERR_BIT & cmdrsp) |
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break; |
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/* Link ID */ |
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linkid = cfpkt_extr_head_u8(pkt); |
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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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linkparam.u.rfm.connid = |
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cfpkt_extr_head_u32(pkt); |
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cp = (u8 *) linkparam.u.rfm.volume; |
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for (tmp = cfpkt_extr_head_u8(pkt); |
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cfpkt_more(pkt) && tmp != '\0'; |
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tmp = cfpkt_extr_head_u8(pkt)) |
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*cp++ = tmp; |
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*cp = '\0'; |
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|
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if (CFCTRL_ERR_BIT & cmdrsp) |
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break; |
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/* Link ID */ |
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linkid = cfpkt_extr_head_u8(pkt); |
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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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linkparam.u.utility.fifosize_kb = |
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cfpkt_extr_head_u16(pkt); |
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/* Fifosize bufs */ |
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linkparam.u.utility.fifosize_bufs = |
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cfpkt_extr_head_u16(pkt); |
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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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tmp = cfpkt_extr_head_u8(pkt); |
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*cp++ = tmp; |
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} |
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/* Length */ |
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len = cfpkt_extr_head_u8(pkt); |
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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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tmp = cfpkt_extr_head_u8(pkt); |
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*cp++ = tmp; |
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} |
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if (CFCTRL_ERR_BIT & cmdrsp) |
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break; |
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/* Link ID */ |
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linkid = cfpkt_extr_head_u8(pkt); |
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/* Length */ |
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len = cfpkt_extr_head_u8(pkt); |
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/* Param Data */ |
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cfpkt_extr_head(pkt, ¶m, len); |
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break; |
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default: |
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pr_warn("Request setup, invalid type (%d)\n", |
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serv); |
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goto error; |
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} |
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|
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rsp.cmd = cmd; |
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rsp.param = linkparam; |
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spin_lock_bh(&cfctrl->info_list_lock); |
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req = cfctrl_remove_req(cfctrl, &rsp); |
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|
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if (CFCTRL_ERR_BIT == (CFCTRL_ERR_BIT & cmdrsp) || |
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cfpkt_erroneous(pkt)) { |
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pr_err("Invalid O/E bit or parse error " |
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"on CAIF control channel\n"); |
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cfctrl->res.reject_rsp(cfctrl->serv.layer.up, |
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0, |
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req ? req->client_layer |
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: NULL); |
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} else { |
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cfctrl->res.linksetup_rsp(cfctrl->serv. |
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layer.up, linkid, |
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serv, physlinkid, |
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req ? req-> |
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client_layer : NULL); |
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} |
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|
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kfree(req); |
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|
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spin_unlock_bh(&cfctrl->info_list_lock); |
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} |
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break; |
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case CFCTRL_CMD_LINK_DESTROY: |
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linkid = cfpkt_extr_head_u8(pkt); |
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cfctrl->res.linkdestroy_rsp(cfctrl->serv.layer.up, linkid); |
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break; |
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case CFCTRL_CMD_LINK_ERR: |
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pr_err("Frame Error Indication received\n"); |
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cfctrl->res.linkerror_ind(); |
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break; |
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case CFCTRL_CMD_ENUM: |
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cfctrl->res.enum_rsp(); |
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break; |
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case CFCTRL_CMD_SLEEP: |
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cfctrl->res.sleep_rsp(); |
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break; |
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case CFCTRL_CMD_WAKE: |
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cfctrl->res.wake_rsp(); |
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break; |
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case CFCTRL_CMD_LINK_RECONF: |
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cfctrl->res.restart_rsp(); |
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break; |
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case CFCTRL_CMD_RADIO_SET: |
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cfctrl->res.radioset_rsp(); |
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break; |
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default: |
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pr_err("Unrecognized Control Frame\n"); |
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goto error; |
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} |
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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
|
|
|