// 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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#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/cfsrvl.h>
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#include <net/caif/cfpkt.h>
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#define container_obj(layr) ((struct cfsrvl *) layr)
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#define UTIL_PAYLOAD 0x00
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#define UTIL_CMD_BIT 0x80
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#define UTIL_REMOTE_SHUTDOWN 0x82
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#define UTIL_FLOW_OFF 0x81
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#define UTIL_FLOW_ON 0x80
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static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt);
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static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt);
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struct cflayer *cfutill_create(u8 channel_id, struct dev_info *dev_info)
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{
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struct cfsrvl *util = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
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if (!util)
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return NULL;
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caif_assert(offsetof(struct cfsrvl, layer) == 0);
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cfsrvl_init(util, channel_id, dev_info, true);
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util->layer.receive = cfutill_receive;
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util->layer.transmit = cfutill_transmit;
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snprintf(util->layer.name, CAIF_LAYER_NAME_SZ, "util1");
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return &util->layer;
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}
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static int cfutill_receive(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 cmd = -1;
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struct cfsrvl *service = container_obj(layr);
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caif_assert(layr != NULL);
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caif_assert(layr->up != NULL);
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caif_assert(layr->up->receive != NULL);
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caif_assert(layr->up->ctrlcmd != NULL);
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if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
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pr_err("Packet is erroneous!\n");
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cfpkt_destroy(pkt);
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return -EPROTO;
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}
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switch (cmd) {
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case UTIL_PAYLOAD:
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return layr->up->receive(layr->up, pkt);
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case UTIL_FLOW_OFF:
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layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
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cfpkt_destroy(pkt);
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return 0;
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case UTIL_FLOW_ON:
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layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
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cfpkt_destroy(pkt);
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return 0;
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case UTIL_REMOTE_SHUTDOWN: /* Remote Shutdown Request */
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pr_err("REMOTE SHUTDOWN REQUEST RECEIVED\n");
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layr->ctrlcmd(layr, CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, 0);
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service->open = false;
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cfpkt_destroy(pkt);
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return 0;
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default:
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cfpkt_destroy(pkt);
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pr_warn("Unknown service control %d (0x%x)\n", cmd, cmd);
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return -EPROTO;
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}
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}
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static int cfutill_transmit(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 zero = 0;
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struct caif_payload_info *info;
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int ret;
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struct cfsrvl *service = container_obj(layr);
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caif_assert(layr != NULL);
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caif_assert(layr->dn != NULL);
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caif_assert(layr->dn->transmit != NULL);
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if (!cfsrvl_ready(service, &ret)) {
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cfpkt_destroy(pkt);
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return ret;
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}
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cfpkt_add_head(pkt, &zero, 1);
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/* Add info for MUX-layer to route the packet out. */
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info = cfpkt_info(pkt);
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info->channel_id = service->layer.id;
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/*
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* To optimize alignment, we add up the size of CAIF header before
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* payload.
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*/
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info->hdr_len = 1;
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info->dev_info = &service->dev_info;
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return layr->dn->transmit(layr->dn, pkt);
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}
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