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 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 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 177bool cfsrvl_ready(struct cfsrvl *service, int *err) 178{ 179 if (!service->open) { 180 *err = -ENOTCONN; 181 return false; 182 } 183 return true; 184} 185 186u8 cfsrvl_getphyid(struct cflayer *layer) 187{ 188 struct cfsrvl *servl = container_obj(layer); 189 return servl->dev_info.id; 190} 191 192bool 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 198void 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} 206EXPORT_SYMBOL(caif_free_client); 207 208void 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} 220EXPORT_SYMBOL(caif_client_register_refcnt); 221