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 <linux/module.h>
  14 #include <net/caif/caif_layer.h>
  15 #include <net/caif/cfsrvl.h>
  16 #include <net/caif/cfpkt.h>
  17
  18 #define SRVL_CTRL_PKT_SIZE 1
  19 #define SRVL_FLOW_OFF 0x81
  20 #define SRVL_FLOW_ON  0x80
  21 #define SRVL_SET_PIN  0x82
  22 #define SRVL_CTRL_PKT_SIZE 1
  23
  24 #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  25
  26 static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  27                                 int phyid)
  28 {
  29         struct cfsrvl *service = container_obj(layr);
  30
  31         if (layr->up == NULL || layr->up->ctrlcmd == NULL)
  32                 return;
  33
  34         switch (ctrl) {
  35         case CAIF_CTRLCMD_INIT_RSP:
  36                 service->open = true;
  37                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  38                 break;
  39         case CAIF_CTRLCMD_DEINIT_RSP:
  40         case CAIF_CTRLCMD_INIT_FAIL_RSP:
  41                 service->open = false;
  42                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  43                 break;
  44         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  45                 if (phyid != service->dev_info.id)
  46                         break;
  47                 if (service->modem_flow_on)
  48                         layr->up->ctrlcmd(layr->up,
  49                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  50                 service->phy_flow_on = false;
  51                 break;
  52         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  53                 if (phyid != service->dev_info.id)
  54                         return;
  55                 if (service->modem_flow_on) {
  56                         layr->up->ctrlcmd(layr->up,
  57                                            CAIF_CTRLCMD_FLOW_ON_IND,
  58                                            phyid);
  59                 }
  60                 service->phy_flow_on = true;
  61                 break;
  62         case CAIF_CTRLCMD_FLOW_OFF_IND:
  63                 if (service->phy_flow_on) {
  64                         layr->up->ctrlcmd(layr->up,
  65                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  66                 }
  67                 service->modem_flow_on = false;
  68                 break;
  69         case CAIF_CTRLCMD_FLOW_ON_IND:
  70                 if (service->phy_flow_on) {
  71                         layr->up->ctrlcmd(layr->up,
  72                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  73                 }
  74                 service->modem_flow_on = true;
  75                 break;
  76         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  77                 /* In case interface is down, let's fake a remove shutdown */
  78                 layr->up->ctrlcmd(layr->up,
  79                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  80                 break;
  81         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  82                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  83                 break;
  84         default:
  85                 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
  86                 /* We have both modem and phy flow on, send flow on */
  87                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  88                 service->phy_flow_on = true;
  89                 break;
  90         }
  91 }
  92
  93 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  94 {
  95         struct cfsrvl *service = container_obj(layr);
  96
  97         caif_assert(layr != NULL);
  98         caif_assert(layr->dn != NULL);
  99         caif_assert(layr->dn->transmit != NULL);
 100
 101         if (!service->supports_flowctrl)
 102                 return 0;
 103
 104         switch (ctrl) {
 105         case CAIF_MODEMCMD_FLOW_ON_REQ:
 106                 {
 107                         struct cfpkt *pkt;
 108                         struct caif_payload_info *info;
 109                         u8 flow_on = SRVL_FLOW_ON;
 110                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 111                         if (!pkt)
 112                                 return -ENOMEM;
 113
 114                         if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
 115                                 pr_err("Packet is erroneous!\n");
 116                                 cfpkt_destroy(pkt);
 117                                 return -EPROTO;
 118                         }
 119                         info = cfpkt_info(pkt);
 120                         info->channel_id = service->layer.id;
 121                         info->hdr_len = 1;
 122                         info->dev_info = &service->dev_info;
 123                         return layr->dn->transmit(layr->dn, pkt);
 124                 }
 125         case CAIF_MODEMCMD_FLOW_OFF_REQ:
 126                 {
 127                         struct cfpkt *pkt;
 128                         struct caif_payload_info *info;
 129                         u8 flow_off = SRVL_FLOW_OFF;
 130                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 131                         if (!pkt)
 132                                 return -ENOMEM;
 133
 134                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
 135                                 pr_err("Packet is erroneous!\n");
 136                                 cfpkt_destroy(pkt);
 137                                 return -EPROTO;
 138                         }
 139                         info = cfpkt_info(pkt);
 140                         info->channel_id = service->layer.id;
 141                         info->hdr_len = 1;
 142                         info->dev_info = &service->dev_info;
 143                         return layr->dn->transmit(layr->dn, pkt);
 144                 }
 145         default:
 146           break;
 147         }
 148         return -EINVAL;
 149 }
 150
 151 static void cfsrvl_release(struct cflayer *layer)
 152 {
 153         struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
 154         kfree(service);
 155 }
 156
 157 void cfsrvl_init(struct cfsrvl *service,
 158                         u8 channel_id,
 159                         struct dev_info *dev_info,
 160                         bool supports_flowctrl
 161                         )
 162 {
 163         caif_assert(offsetof(struct cfsrvl, layer) == 0);
 164         service->open = false;
 165         service->modem_flow_on = true;
 166         service->phy_flow_on = true;
 167         service->layer.id = channel_id;
 168         service->layer.ctrlcmd = cfservl_ctrlcmd;
 169         service->layer.modemcmd = cfservl_modemcmd;
 170         service->dev_info = *dev_info;
 171         service->supports_flowctrl = supports_flowctrl;
 172         service->release = cfsrvl_release;
 173 }
 174
 175 bool cfsrvl_ready(struct cfsrvl *service, int *err)
 176 {
 177         if (service->open && service->modem_flow_on && service->phy_flow_on)
 178                 return true;
 179         if (!service->open) {
 180                 *err = -ENOTCONN;
 181                 return false;
 182         }
 183         caif_assert(!(service->modem_flow_on && service->phy_flow_on));
 184         *err = -EAGAIN;
 185         return false;
 186 }
 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 }
 199
 200 void caif_free_client(struct cflayer *adap_layer)
 201 {
 202         struct cfsrvl *servl;
 203         if (adap_layer == NULL || adap_layer->dn == NULL)
 204                 return;
 205         servl = container_obj(adap_layer->dn);
 206         servl->release(&servl->layer);
 207 }
 208 EXPORT_SYMBOL(caif_free_client);
 209
 210 void caif_client_register_refcnt(struct cflayer *adapt_layer,
 211                                         void (*hold)(struct cflayer *lyr),
 212                                         void (*put)(struct cflayer *lyr))
 213 {
 214         struct cfsrvl *service;
 215         service = container_of(adapt_layer->dn, struct cfsrvl, layer);
 216
 217         WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL);
 218         service->hold = hold;
 219         service->put = put;
 220 }
 221 EXPORT_SYMBOL(caif_client_register_refcnt);