// 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/stddef.h>
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#include <linux/slab.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 VEI_PAYLOAD 0x00
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#define VEI_CMD_BIT 0x80
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#define VEI_FLOW_OFF 0x81
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#define VEI_FLOW_ON 0x80
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#define VEI_SET_PIN 0x82
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#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
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static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
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static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
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struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
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{
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struct cfsrvl *vei = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
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if (!vei)
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return NULL;
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caif_assert(offsetof(struct cfsrvl, layer) == 0);
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cfsrvl_init(vei, channel_id, dev_info, true);
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vei->layer.receive = cfvei_receive;
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vei->layer.transmit = cfvei_transmit;
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snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ, "vei%d", channel_id);
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return &vei->layer;
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}
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static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 cmd;
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int ret;
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caif_assert(layr->up != NULL);
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caif_assert(layr->receive != NULL);
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caif_assert(layr->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 VEI_PAYLOAD:
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ret = layr->up->receive(layr->up, pkt);
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return ret;
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case VEI_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 VEI_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 VEI_SET_PIN: /* SET RS232 PIN */
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cfpkt_destroy(pkt);
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return 0;
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default: /* SET RS232 PIN */
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pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd);
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cfpkt_destroy(pkt);
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return -EPROTO;
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}
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}
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static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
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{
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u8 tmp = 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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if (!cfsrvl_ready(service, &ret))
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goto err;
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caif_assert(layr->dn != NULL);
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caif_assert(layr->dn->transmit != NULL);
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if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
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pr_err("Packet is erroneous!\n");
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ret = -EPROTO;
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goto err;
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}
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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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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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err:
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cfpkt_destroy(pkt);
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return ret;
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}
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