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 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
   8
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <net/caif/caif_layer.h>
  14 #include <net/caif/cfsrvl.h>
  15 #include <net/caif/cfpkt.h>
  16
  17 #define SRVL_CTRL_PKT_SIZE 1
  18 #define SRVL_FLOW_OFF 0x81
  19 #define SRVL_FLOW_ON  0x80
  20 #define SRVL_SET_PIN  0x82
  21 #define SRVL_CTRL_PKT_SIZE 1
  22
  23 #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  24
  25 static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  26                                 int phyid)
  27 {
  28         struct cfsrvl *service = container_obj(layr);
  29
  30         caif_assert(layr->up != NULL);
  31         caif_assert(layr->up->ctrlcmd != NULL);
  32
  33         switch (ctrl) {
  34         case CAIF_CTRLCMD_INIT_RSP:
  35                 service->open = true;
  36                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  37                 break;
  38         case CAIF_CTRLCMD_DEINIT_RSP:
  39         case CAIF_CTRLCMD_INIT_FAIL_RSP:
  40                 service->open = false;
  41                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  42                 break;
  43         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  44                 if (phyid != service->dev_info.id)
  45                         break;
  46                 if (service->modem_flow_on)
  47                         layr->up->ctrlcmd(layr->up,
  48                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  49                 service->phy_flow_on = false;
  50                 break;
  51         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  52                 if (phyid != service->dev_info.id)
  53                         return;
  54                 if (service->modem_flow_on) {
  55                         layr->up->ctrlcmd(layr->up,
  56                                            CAIF_CTRLCMD_FLOW_ON_IND,
  57                                            phyid);
  58                 }
  59                 service->phy_flow_on = true;
  60                 break;
  61         case CAIF_CTRLCMD_FLOW_OFF_IND:
  62                 if (service->phy_flow_on) {
  63                         layr->up->ctrlcmd(layr->up,
  64                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  65                 }
  66                 service->modem_flow_on = false;
  67                 break;
  68         case CAIF_CTRLCMD_FLOW_ON_IND:
  69                 if (service->phy_flow_on) {
  70                         layr->up->ctrlcmd(layr->up,
  71                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  72                 }
  73                 service->modem_flow_on = true;
  74                 break;
  75         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  76                 /* In case interface is down, let's fake a remove shutdown */
  77                 layr->up->ctrlcmd(layr->up,
  78                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  79                 break;
  80         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  81                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  82                 break;
  83         default:
  84                 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
  85                 /* We have both modem and phy flow on, send flow on */
  86                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  87                 service->phy_flow_on = true;
  88                 break;
  89         }
  90 }
  91
  92 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  93 {
  94         struct cfsrvl *service = container_obj(layr);
  95
  96         caif_assert(layr != NULL);
  97         caif_assert(layr->dn != NULL);
  98         caif_assert(layr->dn->transmit != NULL);
  99
 100         if (!service->supports_flowctrl)
 101                 return 0;
 102
 103         switch (ctrl) {
 104         case CAIF_MODEMCMD_FLOW_ON_REQ:
 105                 {
 106                         struct cfpkt *pkt;
 107                         struct caif_payload_info *info;
 108                         u8 flow_on = SRVL_FLOW_ON;
 109                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 110                         if (!pkt) {
 111                                 pr_warn("Out of memory\n");
 112                                 return -ENOMEM;
 113                         }
 114
 115                         if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
 116                                 pr_err("Packet is erroneous!\n");
 117                                 cfpkt_destroy(pkt);
 118                                 return -EPROTO;
 119                         }
 120                         info = cfpkt_info(pkt);
 121                         info->channel_id = service->layer.id;
 122                         info->hdr_len = 1;
 123                         info->dev_info = &service->dev_info;
 124                         return layr->dn->transmit(layr->dn, pkt);
 125                 }
 126         case CAIF_MODEMCMD_FLOW_OFF_REQ:
 127                 {
 128                         struct cfpkt *pkt;
 129                         struct caif_payload_info *info;
 130                         u8 flow_off = SRVL_FLOW_OFF;
 131                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 132                         if (!pkt) {
 133                                 pr_warn("Out of memory\n");
 134                                 return -ENOMEM;
 135                         }
 136
 137                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
 138                                 pr_err("Packet is erroneous!\n");
 139                                 cfpkt_destroy(pkt);
 140                                 return -EPROTO;
 141                         }
 142                         info = cfpkt_info(pkt);
 143                         info->channel_id = service->layer.id;
 144                         info->hdr_len = 1;
 145                         info->dev_info = &service->dev_info;
 146                         return layr->dn->transmit(layr->dn, pkt);
 147                 }
 148         default:
 149           break;
 150         }
 151         return -EINVAL;
 152 }
 153
 154 void cfservl_destroy(struct cflayer *layer)
 155 {
 156         kfree(layer);
 157 }
 158
 159 void cfsrvl_release(struct kref *kref)
 160 {
 161         struct cfsrvl *service = container_of(kref, struct cfsrvl, ref);
 162         kfree(service);
 163 }
 164
 165 void cfsrvl_init(struct cfsrvl *service,
 166                         u8 channel_id,
 167                         struct dev_info *dev_info,
 168                         bool supports_flowctrl
 169                         )
 170 {
 171         caif_assert(offsetof(struct cfsrvl, layer) == 0);
 172         service->open = false;
 173         service->modem_flow_on = true;
 174         service->phy_flow_on = true;
 175         service->layer.id = channel_id;
 176         service->layer.ctrlcmd = cfservl_ctrlcmd;
 177         service->layer.modemcmd = cfservl_modemcmd;
 178         service->dev_info = *dev_info;
 179         service->supports_flowctrl = supports_flowctrl;
 180         service->release = cfsrvl_release;
 181         kref_init(&service->ref);
 182 }
 183
 184
 185 bool cfsrvl_ready(struct cfsrvl *service, int *err)
 186 {
 187         if (service->open && service->modem_flow_on && service->phy_flow_on)
 188                 return true;
 189         if (!service->open) {
 190                 *err = -ENOTCONN;
 191                 return false;
 192         }
 193         caif_assert(!(service->modem_flow_on && service->phy_flow_on));
 194         *err = -EAGAIN;
 195         return false;
 196 }
 197 u8 cfsrvl_getphyid(struct cflayer *layer)
 198 {
 199         struct cfsrvl *servl = container_obj(layer);
 200         return servl->dev_info.id;
 201 }
 202
 203 bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
 204 {
 205         struct cfsrvl *servl = container_obj(layer);
 206         return servl->dev_info.id == phyid;
 207 }