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#include <linux/stddef.h>
   8#include <linux/slab.h>
   9#include <net/caif/caif_layer.h>
  10#include <net/caif/cfsrvl.h>
  11#include <net/caif/cfpkt.h>
  12
  13#define VEI_PAYLOAD  0x00
  14#define VEI_CMD_BIT  0x80
  15#define VEI_FLOW_OFF 0x81
  16#define VEI_FLOW_ON  0x80
  17#define VEI_SET_PIN  0x82
  18#define VEI_CTRL_PKT_SIZE 1
  19#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  20
  21static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt);
  22static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt);
  23
  24struct cflayer *cfvei_create(u8 channel_id, struct dev_info *dev_info)
  25{
  26        struct cfsrvl *vei = kmalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
  27        if (!vei) {
  28                pr_warning("CAIF: %s(): Out of memory\n", __func__);
  29                return NULL;
  30        }
  31        caif_assert(offsetof(struct cfsrvl, layer) == 0);
  32        memset(vei, 0, sizeof(struct cfsrvl));
  33        cfsrvl_init(vei, channel_id, dev_info);
  34        vei->layer.receive = cfvei_receive;
  35        vei->layer.transmit = cfvei_transmit;
  36        snprintf(vei->layer.name, CAIF_LAYER_NAME_SZ - 1, "vei%d", channel_id);
  37        return &vei->layer;
  38}
  39
  40static int cfvei_receive(struct cflayer *layr, struct cfpkt *pkt)
  41{
  42        u8 cmd;
  43        int ret;
  44        caif_assert(layr->up != NULL);
  45        caif_assert(layr->receive != NULL);
  46        caif_assert(layr->ctrlcmd != NULL);
  47
  48
  49        if (cfpkt_extr_head(pkt, &cmd, 1) < 0) {
  50                pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
  51                cfpkt_destroy(pkt);
  52                return -EPROTO;
  53        }
  54        switch (cmd) {
  55        case VEI_PAYLOAD:
  56                ret = layr->up->receive(layr->up, pkt);
  57                return ret;
  58        case VEI_FLOW_OFF:
  59                layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_OFF_IND, 0);
  60                cfpkt_destroy(pkt);
  61                return 0;
  62        case VEI_FLOW_ON:
  63                layr->ctrlcmd(layr, CAIF_CTRLCMD_FLOW_ON_IND, 0);
  64                cfpkt_destroy(pkt);
  65                return 0;
  66        case VEI_SET_PIN:       /* SET RS232 PIN */
  67                cfpkt_destroy(pkt);
  68                return 0;
  69        default:                /* SET RS232 PIN */
  70                pr_warning("CAIF: %s():Unknown VEI control packet %d (0x%x)!\n",
  71                           __func__, cmd, cmd);
  72                cfpkt_destroy(pkt);
  73                return -EPROTO;
  74        }
  75}
  76
  77static int cfvei_transmit(struct cflayer *layr, struct cfpkt *pkt)
  78{
  79        u8 tmp = 0;
  80        struct caif_payload_info *info;
  81        int ret;
  82        struct cfsrvl *service = container_obj(layr);
  83        if (!cfsrvl_ready(service, &ret))
  84                return ret;
  85        caif_assert(layr->dn != NULL);
  86        caif_assert(layr->dn->transmit != NULL);
  87        if (cfpkt_getlen(pkt) > CAIF_MAX_PAYLOAD_SIZE) {
  88                pr_warning("CAIF: %s(): Packet too large - size=%d\n",
  89                           __func__, cfpkt_getlen(pkt));
  90                return -EOVERFLOW;
  91        }
  92
  93        if (cfpkt_add_head(pkt, &tmp, 1) < 0) {
  94                pr_err("CAIF: %s(): Packet is erroneous!\n", __func__);
  95                return -EPROTO;
  96        }
  97
  98        /* Add info-> for MUX-layer to route the packet out. */
  99        info = cfpkt_info(pkt);
 100        info->channel_id = service->layer.id;
 101        info->hdr_len = 1;
 102        info->dev_info = &service->dev_info;
 103        ret = layr->dn->transmit(layr->dn, pkt);
 104        if (ret < 0)
 105                cfpkt_extr_head(pkt, &tmp, 1);
 106        return ret;
 107}
 108