net/caif/cfsrvl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson AB 2010
   4  * Author:      Sjur Brendeland
   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 <linux/pkt_sched.h>
  15 #include <net/caif/caif_layer.h>
  16 #include <net/caif/cfsrvl.h>
  17 #include <net/caif/cfpkt.h>
  18 #include <net/caif/caif_dev.h>
  19
  20 #define SRVL_CTRL_PKT_SIZE 1
  21 #define SRVL_FLOW_OFF 0x81
  22 #define SRVL_FLOW_ON  0x80
  23 #define SRVL_SET_PIN  0x82
  24
  25 #define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  26
  27 static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
  28                             int phyid)
  29 {
  30         struct cfsrvl *service = container_obj(layr);
  31
  32         if (layr->up == NULL || layr->up->ctrlcmd == NULL)
  33                 return;
  34
  35         switch (ctrl) {
  36         case CAIF_CTRLCMD_INIT_RSP:
  37                 service->open = true;
  38                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  39                 break;
  40         case CAIF_CTRLCMD_DEINIT_RSP:
  41         case CAIF_CTRLCMD_INIT_FAIL_RSP:
  42                 service->open = false;
  43                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  44                 break;
  45         case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
  46                 if (phyid != service->dev_info.id)
  47                         break;
  48                 if (service->modem_flow_on)
  49                         layr->up->ctrlcmd(layr->up,
  50                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  51                 service->phy_flow_on = false;
  52                 break;
  53         case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
  54                 if (phyid != service->dev_info.id)
  55                         return;
  56                 if (service->modem_flow_on) {
  57                         layr->up->ctrlcmd(layr->up,
  58                                            CAIF_CTRLCMD_FLOW_ON_IND,
  59                                            phyid);
  60                 }
  61                 service->phy_flow_on = true;
  62                 break;
  63         case CAIF_CTRLCMD_FLOW_OFF_IND:
  64                 if (service->phy_flow_on) {
  65                         layr->up->ctrlcmd(layr->up,
  66                                           CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
  67                 }
  68                 service->modem_flow_on = false;
  69                 break;
  70         case CAIF_CTRLCMD_FLOW_ON_IND:
  71                 if (service->phy_flow_on) {
  72                         layr->up->ctrlcmd(layr->up,
  73                                           CAIF_CTRLCMD_FLOW_ON_IND, phyid);
  74                 }
  75                 service->modem_flow_on = true;
  76                 break;
  77         case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
  78                 /* In case interface is down, let's fake a remove shutdown */
  79                 layr->up->ctrlcmd(layr->up,
  80                                 CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
  81                 break;
  82         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
  83                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  84                 break;
  85         default:
  86                 pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
  87                 /* We have both modem and phy flow on, send flow on */
  88                 layr->up->ctrlcmd(layr->up, ctrl, phyid);
  89                 service->phy_flow_on = true;
  90                 break;
  91         }
  92 }
  93
  94 static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
  95 {
  96         struct cfsrvl *service = container_obj(layr);
  97
  98         caif_assert(layr != NULL);
  99         caif_assert(layr->dn != NULL);
 100         caif_assert(layr->dn->transmit != NULL);
 101
 102         if (!service->supports_flowctrl)
 103                 return 0;
 104
 105         switch (ctrl) {
 106         case CAIF_MODEMCMD_FLOW_ON_REQ:
 107                 {
 108                         struct cfpkt *pkt;
 109                         struct caif_payload_info *info;
 110                         u8 flow_on = SRVL_FLOW_ON;
 111                         pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
 112                         if (!pkt)
 113                                 return -ENOMEM;
 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                         cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
 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                                 return -ENOMEM;
 135
 136                         if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
 137                                 pr_err("Packet is erroneous!\n");
 138                                 cfpkt_destroy(pkt);
 139                                 return -EPROTO;
 140                         }
 141                         info = cfpkt_info(pkt);
 142                         info->channel_id = service->layer.id;
 143                         info->hdr_len = 1;
 144                         info->dev_info = &service->dev_info;
 145                         cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
 146                         return layr->dn->transmit(layr->dn, pkt);
 147                 }
 148         default:
 149           break;
 150         }
 151         return -EINVAL;
 152 }
 153
 154 static void cfsrvl_release(struct cflayer *layer)
 155 {
 156         struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
 157         kfree(service);
 158 }
 159
 160 void cfsrvl_init(struct cfsrvl *service,
 161                  u8 channel_id,
 162                  struct dev_info *dev_info,
 163                  bool supports_flowctrl)
 164 {
 165         caif_assert(offsetof(struct cfsrvl, layer) == 0);
 166         service->open = false;
 167         service->modem_flow_on = true;
 168         service->phy_flow_on = true;
 169         service->layer.id = channel_id;
 170         service->layer.ctrlcmd = cfservl_ctrlcmd;
 171         service->layer.modemcmd = cfservl_modemcmd;
 172         service->dev_info = *dev_info;
 173         service->supports_flowctrl = supports_flowctrl;
 174         service->release = cfsrvl_release;
 175 }
 176
 177 bool cfsrvl_ready(struct cfsrvl *service, int *err)
 178 {
 179         if (!service->open) {
 180                 *err = -ENOTCONN;
 181                 return false;
 182         }
 183         return true;
 184 }
 185
 186 u8 cfsrvl_getphyid(struct cflayer *layer)
 187 {
 188         struct cfsrvl *servl = container_obj(layer);
 189         return servl->dev_info.id;
 190 }
 191
 192 bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
 193 {
 194         struct cfsrvl *servl = container_obj(layer);
 195         return servl->dev_info.id == phyid;
 196 }
 197
 198 void caif_free_client(struct cflayer *adap_layer)
 199 {
 200         struct cfsrvl *servl;
 201         if (adap_layer == NULL || adap_layer->dn == NULL)
 202                 return;
 203         servl = container_obj(adap_layer->dn);
 204         servl->release(&servl->layer);
 205 }
 206 EXPORT_SYMBOL(caif_free_client);
 207
 208 void caif_client_register_refcnt(struct cflayer *adapt_layer,
 209                                  void (*hold)(struct cflayer *lyr),
 210                                  void (*put)(struct cflayer *lyr))
 211 {
 212         struct cfsrvl *service;
 213
 214         if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
 215                 return;
 216         service = container_of(adapt_layer->dn, struct cfsrvl, layer);
 217         service->hold = hold;
 218         service->put = put;
 219 }
 220 EXPORT_SYMBOL(caif_client_register_refcnt);