linux/net/caif/cfsrvl.c
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   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 <linux/pkt_sched.h>
  15#include <net/caif/caif_layer.h>
  16#include <net/caif/cfsrvl.h>
  17#include <net/caif/cfpkt.h>
  18
  19#define SRVL_CTRL_PKT_SIZE 1
  20#define SRVL_FLOW_OFF 0x81
  21#define SRVL_FLOW_ON  0x80
  22#define SRVL_SET_PIN  0x82
  23#define SRVL_CTRL_PKT_SIZE 1
  24
  25#define container_obj(layr) container_of(layr, struct cfsrvl, layer)
  26
  27static 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
  94static 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
 154static void cfsrvl_release(struct cflayer *layer)
 155{
 156        struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
 157        kfree(service);
 158}
 159
 160void cfsrvl_init(struct cfsrvl *service,
 161                        u8 channel_id,
 162                        struct dev_info *dev_info,
 163                        bool supports_flowctrl
 164                        )
 165{
 166        caif_assert(offsetof(struct cfsrvl, layer) == 0);
 167        service->open = false;
 168        service->modem_flow_on = true;
 169        service->phy_flow_on = true;
 170        service->layer.id = channel_id;
 171        service->layer.ctrlcmd = cfservl_ctrlcmd;
 172        service->layer.modemcmd = cfservl_modemcmd;
 173        service->dev_info = *dev_info;
 174        service->supports_flowctrl = supports_flowctrl;
 175        service->release = cfsrvl_release;
 176}
 177
 178bool cfsrvl_ready(struct cfsrvl *service, int *err)
 179{
 180        if (!service->open) {
 181                *err = -ENOTCONN;
 182                return false;
 183        }
 184        return true;
 185}
 186
 187u8 cfsrvl_getphyid(struct cflayer *layer)
 188{
 189        struct cfsrvl *servl = container_obj(layer);
 190        return servl->dev_info.id;
 191}
 192
 193bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
 194{
 195        struct cfsrvl *servl = container_obj(layer);
 196        return servl->dev_info.id == phyid;
 197}
 198
 199void caif_free_client(struct cflayer *adap_layer)
 200{
 201        struct cfsrvl *servl;
 202        if (adap_layer == NULL || adap_layer->dn == NULL)
 203                return;
 204        servl = container_obj(adap_layer->dn);
 205        servl->release(&servl->layer);
 206}
 207EXPORT_SYMBOL(caif_free_client);
 208
 209void caif_client_register_refcnt(struct cflayer *adapt_layer,
 210                                        void (*hold)(struct cflayer *lyr),
 211                                        void (*put)(struct cflayer *lyr))
 212{
 213        struct cfsrvl *service;
 214
 215        if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
 216                return;
 217        service = container_of(adapt_layer->dn, struct cfsrvl, layer);
 218        service->hold = hold;
 219        service->put = put;
 220}
 221EXPORT_SYMBOL(caif_client_register_refcnt);
 222
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