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
  28         caif_assert(layr->up != NULL);
  29         caif_assert(layr->up->ctrlcmd != NULL);
  30
  31         switch (ctrl) {
  32         case CAIF_CTRLCMD_INIT_RSP:
  33                 service->open = true;
  34                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  35                 break;
  36         case CAIF_CTRLCMD_DEINIT_RSP:
  37         case CAIF_CTRLCMD_INIT_FAIL_RSP:
  38                 service->open = false;
  39                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  40                 break;
  41         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  42                 if (phyid != service->dev_info.id)
  43                         break;
  44                 if (service->modem_flow_on)
  45                         layr->up->ctrlcmd(layr->up,
  46                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  47                 service->phy_flow_on = false;
  48                 break;
  49         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  50                 if (phyid != service->dev_info.id)
  51                         return;
  52                 if (service->modem_flow_on) {
  53                         layr->up->ctrlcmd(layr->up,
  54                                            CAIF_CTRLCMD_FLOW_ON_IND,
  55                                            phyid);
  56                 }
  57                 service->phy_flow_on = true;
  58                 break;
  59         case CAIF_CTRLCMD_FLOW_OFF_IND:
  60                 if (service->phy_flow_on) {
  61                         layr->up->ctrlcmd(layr->up,
  62                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  63                 }
  64                 service->modem_flow_on = false;
  65                 break;
  66         case CAIF_CTRLCMD_FLOW_ON_IND:
  67                 if (service->phy_flow_on) {
  68                         layr->up->ctrlcmd(layr->up,
  69                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  70                 }
  71                 service->modem_flow_on = true;
  72                 break;
  73         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  74                 /* In case interface is down, let's fake a remove shutdown */
  75                 layr->up->ctrlcmd(layr->up,
  76                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  77                 break;
  78         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  79                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  80                 break;
  81         default:
  82                 pr_warning("CAIF: %s(): "
  83                            "Unexpected ctrl in cfsrvl (%d)\n", __func__, ctrl);
  84                 /* We have both modem and phy flow on, send flow on */
  85                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  86                 service->phy_flow_on = true;
  87                 break;
  88         }
  89 }
  90
  91 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  92 {
  93         struct cfsrvl *service = container_obj(layr);
  94
  95         caif_assert(layr != NULL);
  96         caif_assert(layr->dn != NULL);
  97         caif_assert(layr->dn->transmit != NULL);
  98
  99         if (!service->supports_flowctrl)
 100                 return 0;
 101
 102         switch (ctrl) {
 103         case CAIF_MODEMCMD_FLOW_ON_REQ:
 104                 {
 105                         struct cfpkt *pkt;
 106                         struct caif_payload_info *info;
 107                         u8 flow_on = SRVL_FLOW_ON;
 108                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 109                         if (!pkt) {
 110                                 pr_warning("CAIF: %s(): Out of memory\n",
 111                                         __func__);
 112                                 return -ENOMEM;
 113                         }
 114
 115                         if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
 116                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
 117                                         __func__);
 118                                 cfpkt_destroy(pkt);
 119                                 return -EPROTO;
 120                         }
 121                         info = cfpkt_info(pkt);
 122                         info->channel_id = service->layer.id;
 123                         info->hdr_len = 1;
 124                         info->dev_info = &service->dev_info;
 125                         return layr->dn->transmit(layr->dn, pkt);
 126                 }
 127         case CAIF_MODEMCMD_FLOW_OFF_REQ:
 128                 {
 129                         struct cfpkt *pkt;
 130                         struct caif_payload_info *info;
 131                         u8 flow_off = SRVL_FLOW_OFF;
 132                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 133                         if (!pkt) {
 134                                 pr_warning("CAIF: %s(): Out of memory\n",
 135                                         __func__);
 136                                 return -ENOMEM;
 137                         }
 138
 139                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
 140                                 pr_err("CAIF: %s(): Packet is erroneous!\n",
 141                                         __func__);
 142                                 cfpkt_destroy(pkt);
 143                                 return -EPROTO;
 144                         }
 145                         info = cfpkt_info(pkt);
 146                         info->channel_id = service->layer.id;
 147                         info->hdr_len = 1;
 148                         info->dev_info = &service->dev_info;
 149                         return layr->dn->transmit(layr->dn, pkt);
 150                 }
 151         default:
 152           break;
 153         }
 154         return -EINVAL;
 155 }
 156
 157 void cfservl_destroy(struct cflayer *layer)
 158 {
 159         kfree(layer);
 160 }
 161
 162 void cfsrvl_release(struct kref *kref)
 163 {
 164         struct cfsrvl *service = container_of(kref, struct cfsrvl, ref);
 165         kfree(service);
 166 }
 167
 168 void cfsrvl_init(struct cfsrvl *service,
 169                         u8 channel_id,
 170                         struct dev_info *dev_info,
 171                         bool supports_flowctrl
 172                         )
 173 {
 174         caif_assert(offsetof(struct cfsrvl, layer) == 0);
 175         service->open = false;
 176         service->modem_flow_on = true;
 177         service->phy_flow_on = true;
 178         service->layer.id = channel_id;
 179         service->layer.ctrlcmd = cfservl_ctrlcmd;
 180         service->layer.modemcmd = cfservl_modemcmd;
 181         service->dev_info = *dev_info;
 182         service->supports_flowctrl = supports_flowctrl;
 183         service->release = cfsrvl_release;
 184         kref_init(&service->ref);
 185 }
 186
 187
 188 bool cfsrvl_ready(struct cfsrvl *service, int *err)
 189 {
 190         if (service->open && service->modem_flow_on && service->phy_flow_on)
 191                 return true;
 192         if (!service->open) {
 193                 *err = -ENOTCONN;
 194                 return false;
 195         }
 196         caif_assert(!(service->modem_flow_on && service->phy_flow_on));
 197         *err = -EAGAIN;
 198         return false;
 199 }
 200 u8 cfsrvl_getphyid(struct cflayer *layer)
 201 {
 202         struct cfsrvl *servl = container_obj(layer);
 203         return servl->dev_info.id;
 204 }
 205
 206 bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
 207 {
 208         struct cfsrvl *servl = container_obj(layer);
 209         return servl->dev_info.id == phyid;
 210 }