linux/net/caif/cfveil.c
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   1/*
   2 * Copyright (C) ST-Ericsson AB 2010
   3 * Author:      Sjur Brendeland/sjur.brandeland@stericsson.com
   4 * License terms: GNU General Public License (GPL) version 2
   5 */
   6
   7#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
   8
   9#include <linux/stddef.h>
  10#include <linux/slab.h>
  11#include <net/caif/caif_layer.h>
  12#include <net/caif/cfsrvl.h>
  13#include <net/caif/cfpkt.h>
  14
  15#define VEI_PAYLOAD  0x00
  16#define VEI_CMD_BIT  0x80
  17#define VEI_FLOW_OFF 0x81
  18#define VEI_FLOW_ON  0x80
  19#define VEI_SET_PIN  0x82
  20#define VEI_CTRL_PKT_SIZE 1
  21#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  22
  23static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
  24static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
  25
  26struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
  27{
  28        struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  29        if (!vei) {
  30                pr_warn("Out of memory\n");
  31                return NULL;
  32        }
  33        caif_assert(offsetof(struct cfsrvl, layer) == 0);
  34        memset(vei, 0, sizeof(struct cfsrvl));
  35        cfsrvl_init(vei, channel_id, dev_info, true);
  36        vei->layer.receive = cfvei_receive;
  37        vei->layer.transmit = cfvei_transmit;
  38        snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id);
  39        return &vei->layer;
  40}
  41
  42static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
  43{
  44        u8 cmd;
  45        int ret;
  46        caif_assert(layr->up != NULL);
  47        caif_assert(layr->receive != NULL);
  48        caif_assert(layr->ctrlcmd != NULL);
  49
  50
  51        if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
  52                pr_err("Packet is erroneous!\n");
  53                cfpkt_destroy(pkt);
  54                return -EPROTO;
  55        }
  56        switch (cmd) {
  57        case VEI_PAYLOAD:
  58                ret = layr->up->receive(layr->up, pkt);
  59                return ret;
  60        case VEI_FLOW_OFF:
  61                layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
  62                cfpkt_destroy(pkt);
  63                return 0;
  64        case VEI_FLOW_ON:
  65                layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
  66                cfpkt_destroy(pkt);
  67                return 0;
  68        case VEI_SET_PIN:       /* SET RS232 PIN */
  69                cfpkt_destroy(pkt);
  70                return 0;
  71        default:                /* SET RS232 PIN */
  72                pr_warn("Unknown VEI control packet %d (0x%x)!\n", cmd, cmd);
  73                cfpkt_destroy(pkt);
  74                return -EPROTO;
  75        }
  76}
  77
  78static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
  79{
  80        u8 tmp = 0;
  81        struct caif_payload_info *info;
  82        int ret;
  83        struct cfsrvl *service = container_obj(layr);
  84        if (!cfsrvl_ready(service, &ret))
  85                return ret;
  86        caif_assert(layr->dn != NULL);
  87        caif_assert(layr->dn->transmit != NULL);
  88
  89        if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
  90                pr_err("Packet is erroneous!\n");
  91                return -EPROTO;
  92        }
  93
  94        /* Add info-> for MUX-layer to route the packet out. */
  95        info = cfpkt_info(pkt);
  96        info->channel_id = service->layer.id;
  97        info->hdr_len = 1;
  98        info->dev_info = &service->dev_info;
  99        ret = layr->dn->transmit(layr->dn, pkt);
 100        if (ret < 0)
 101                cfpkt_extr_head(pkt, &tmp, 1);
 102        return ret;
 103}
 104