net/caif/cfsrvl.c

   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/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/errno.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 SRVL_CTRL_PKT_SIZE 1
  16 #define SRVL_FLOW_OFF 0x81
  17 #define SRVL_FLOW_ON  0x80
  18 #define SRVL_SET_PIN  0x82
  19 #define SRVL_CTRL_PKT_SIZE 1
  20
  21 #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  22
  23 static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  24                                 int phyid)
  25 {
  26         struct cfsrvl *service = container_obj(layr);
  27         caif_assert(layr->up != NULL);
  28         caif_assert(layr->up->ctrlcmd != NULL);
  29         switch (ctrl) {
  30         case CAIF_CTRLCMD_INIT_RSP:
  31                 service->open = true;
  32                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  33                 break;
  34         case CAIF_CTRLCMD_DEINIT_RSP:
  35         case CAIF_CTRLCMD_INIT_FAIL_RSP:
  36                 service->open = false;
  37                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  38                 break;
  39         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  40                 if (phyid != service->dev_info.id)
  41                         break;
  42                 if (service->modem_flow_on)
  43                         layr->up->ctrlcmd(layr->up,
  44                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  45                 service->phy_flow_on = false;
  46                 break;
  47         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  48                 if (phyid != service->dev_info.id)
  49                         return;
  50                 if (service->modem_flow_on) {
  51                         layr->up->ctrlcmd(layr->up,
  52                                            CAIF_CTRLCMD_FLOW_ON_IND,
  53                                            phyid);
  54                 }
  55                 service->phy_flow_on = true;
  56                 break;
  57         case CAIF_CTRLCMD_FLOW_OFF_IND:
  58                 if (service->phy_flow_on) {
  59                         layr->up->ctrlcmd(layr->up,
  60                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  61                 }
  62                 service->modem_flow_on = false;
  63                 break;
  64         case CAIF_CTRLCMD_FLOW_ON_IND:
  65                 if (service->phy_flow_on) {
  66                         layr->up->ctrlcmd(layr->up,
  67                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  68                 }
  69                 service->modem_flow_on = true;
  70                 break;
  71         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  72                 /* In case interface is down, let's fake a remove shutdown */
  73                 layr->up->ctrlcmd(layr->up,
  74                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  75                 break;
  76         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  77                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  78                 break;
  79         default:
  80                 pr_warning("CAIF: %s(): "
  81                            "Unexpected ctrl in cfsrvl (%d)\n", __func__, ctrl);
  82                 /* We have both modem and phy flow on, send flow on */
  83                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  84                 service->phy_flow_on = true;
  85                 break;
  86         }
  87 }
  88
  89 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  90 {
  91         struct cfsrvl *service = container_obj(layr);
  92         caif_assert(layr != NULL);
  93         caif_assert(layr->dn != NULL);
  94         caif_assert(layr->dn->transmit != NULL);
  95         switch (ctrl) {
  96         case CAIF_MODEMCMD_FLOW_ON_REQ:
  97                 {
  98                         struct cfpkt *pkt;
  99                         struct caif_payload_info *info;
 100                         u8 flow_on = SRVL_FLOW_ON;
 101                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 102                         if (!pkt) {
 103                                 pr_warning("CAIF: %s(): Out of memory\n",
 104                                         __func__);
 105                                 return -ENOMEM;
 106                         }
 107
 108                         if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
 109                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
 110                                         __func__);
 111                                 cfpkt_destroy(pkt);
 112                                 return -EPROTO;
 113                         }
 114                         info = cfpkt_info(pkt);
 115                         info->channel_id = service->layer.id;
 116                         info->hdr_len = 1;
 117                         info->dev_info = &service->dev_info;
 118                         return layr->dn->transmit(layr->dn, pkt);
 119                 }
 120         case CAIF_MODEMCMD_FLOW_OFF_REQ:
 121                 {
 122                         struct cfpkt *pkt;
 123                         struct caif_payload_info *info;
 124                         u8 flow_off = SRVL_FLOW_OFF;
 125                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 126                         if (!pkt) {
 127                                 pr_warning("CAIF: %s(): Out of memory\n",
 128                                         __func__);
 129                                 return -ENOMEM;
 130                         }
 131
 132                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
 133                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
 134                                         __func__);
 135                                 cfpkt_destroy(pkt);
 136                                 return -EPROTO;
 137                         }
 138                         info = cfpkt_info(pkt);
 139                         info->channel_id = service->layer.id;
 140                         info->hdr_len = 1;
 141                         info->dev_info = &service->dev_info;
 142                         return layr->dn->transmit(layr->dn, pkt);
 143                 }
 144         default:
 145           break;
 146         }
 147         return -EINVAL;
 148 }
 149
 150 void cfservl_destroy(struct cflayer *layer)
 151 {
 152         kfree(layer);
 153 }
 154
 155 void cfsrvl_init(struct cfsrvl *service,
 156                  u8 channel_id,
 157                  struct dev_info *dev_info)
 158 {
 159         caif_assert(offsetof(struct cfsrvl, layer) == 0);
 160         service->open = false;
 161         service->modem_flow_on = true;
 162         service->phy_flow_on = true;
 163         service->layer.id = channel_id;
 164         service->layer.ctrlcmd = cfservl_ctrlcmd;
 165         service->layer.modemcmd = cfservl_modemcmd;
 166         service->dev_info = *dev_info;
 167         kref_init(&service->ref);
 168 }
 169
 170 void cfsrvl_release(struct kref *kref)
 171 {
 172         struct cfsrvl *service = container_of(kref, struct cfsrvl, ref);
 173         kfree(service);
 174 }
 175
 176 bool cfsrvl_ready(struct cfsrvl *service, int *err)
 177 {
 178         if (service->open && service->modem_flow_on && service->phy_flow_on)
 179                 return true;
 180         if (!service->open) {
 181                 *err = -ENOTCONN;
 182                 return false;
 183         }
 184         caif_assert(!(service->modem_flow_on && service->phy_flow_on));
 185         *err = -EAGAIN;
 186         return false;
 187 }
 188 u8 cfsrvl_getphyid(struct cflayer *layer)
 189 {
 190         struct cfsrvl *servl = container_obj(layer);
 191         return servl->dev_info.id;
 192 }
 193
 194 bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
 195 {
 196         struct cfsrvl *servl = container_obj(layer);
 197         return servl->dev_info.id == phyid;
 198 }