kernel/net/irda/ircomm/ircomm_event.c

   1 /*********************************************************************
   2  *
   3  * Filename:      ircomm_event.c
   4  * Version:       1.0
   5  * Description:   IrCOMM layer state machine
   6  * Status:        Stable
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Jun  6 20:33:11 1999
   9  * Modified at:   Sun Dec 12 13:44:32 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
  13  *
  14  *     This program is free software; you can redistribute it and/or
  15  *     modify it under the terms of the GNU General Public License as
  16  *     published by the Free Software Foundation; either version 2 of
  17  *     the License, or (at your option) any later version.
  18  *
  19  *     This program is distributed in the hope that it will be useful,
  20  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  *     GNU General Public License for more details.
  23  *
  24  *     You should have received a copy of the GNU General Public License
  25  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  26  *
  27  ********************************************************************/
  28
  29 #include <linux/proc_fs.h>
  30 #include <linux/init.h>
  31
  32 #include <net/irda/irda.h>
  33 #include <net/irda/irlmp.h>
  34 #include <net/irda/iriap.h>
  35 #include <net/irda/irttp.h>
  36 #include <net/irda/irias_object.h>
  37
  38 #include <net/irda/ircomm_core.h>
  39 #include <net/irda/ircomm_event.h>
  40
  41 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
  42                              struct sk_buff *skb, struct ircomm_info *info);
  43 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
  44                               struct sk_buff *skb, struct ircomm_info *info);
  45 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
  46                               struct sk_buff *skb, struct ircomm_info *info);
  47 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
  48                              struct sk_buff *skb, struct ircomm_info *info);
  49
  50 const char *const ircomm_state[] = {
  51         "IRCOMM_IDLE",
  52         "IRCOMM_WAITI",
  53         "IRCOMM_WAITR",
  54         "IRCOMM_CONN",
  55 };
  56
  57 static const char *const ircomm_event[] __maybe_unused = {
  58         "IRCOMM_CONNECT_REQUEST",
  59         "IRCOMM_CONNECT_RESPONSE",
  60         "IRCOMM_TTP_CONNECT_INDICATION",
  61         "IRCOMM_LMP_CONNECT_INDICATION",
  62         "IRCOMM_TTP_CONNECT_CONFIRM",
  63         "IRCOMM_LMP_CONNECT_CONFIRM",
  64
  65         "IRCOMM_LMP_DISCONNECT_INDICATION",
  66         "IRCOMM_TTP_DISCONNECT_INDICATION",
  67         "IRCOMM_DISCONNECT_REQUEST",
  68
  69         "IRCOMM_TTP_DATA_INDICATION",
  70         "IRCOMM_LMP_DATA_INDICATION",
  71         "IRCOMM_DATA_REQUEST",
  72         "IRCOMM_CONTROL_REQUEST",
  73         "IRCOMM_CONTROL_INDICATION",
  74 };
  75
  76 static int (*state[])(struct ircomm_cb *self, IRCOMM_EVENT event,
  77                       struct sk_buff *skb, struct ircomm_info *info) =
  78 {
  79         ircomm_state_idle,
  80         ircomm_state_waiti,
  81         ircomm_state_waitr,
  82         ircomm_state_conn,
  83 };
  84
  85 /*
  86  * Function ircomm_state_idle (self, event, skb)
  87  *
  88  *    IrCOMM is currently idle
  89  *
  90  */
  91 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
  92                              struct sk_buff *skb, struct ircomm_info *info)
  93 {
  94         int ret = 0;
  95
  96         switch (event) {
  97         case IRCOMM_CONNECT_REQUEST:
  98                 ircomm_next_state(self, IRCOMM_WAITI);
  99                 ret = self->issue.connect_request(self, skb, info);
 100                 break;
 101         case IRCOMM_TTP_CONNECT_INDICATION:
 102         case IRCOMM_LMP_CONNECT_INDICATION:
 103                 ircomm_next_state(self, IRCOMM_WAITR);
 104                 ircomm_connect_indication(self, skb, info);
 105                 break;
 106         default:
 107                 pr_debug("%s(), unknown event: %s\n", __func__ ,
 108                          ircomm_event[event]);
 109                 ret = -EINVAL;
 110         }
 111         return ret;
 112 }
 113
 114 /*
 115  * Function ircomm_state_waiti (self, event, skb)
 116  *
 117  *    The IrCOMM user has requested an IrCOMM connection to the remote
 118  *    device and is awaiting confirmation
 119  */
 120 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
 121                               struct sk_buff *skb, struct ircomm_info *info)
 122 {
 123         int ret = 0;
 124
 125         switch (event) {
 126         case IRCOMM_TTP_CONNECT_CONFIRM:
 127         case IRCOMM_LMP_CONNECT_CONFIRM:
 128                 ircomm_next_state(self, IRCOMM_CONN);
 129                 ircomm_connect_confirm(self, skb, info);
 130                 break;
 131         case IRCOMM_TTP_DISCONNECT_INDICATION:
 132         case IRCOMM_LMP_DISCONNECT_INDICATION:
 133                 ircomm_next_state(self, IRCOMM_IDLE);
 134                 ircomm_disconnect_indication(self, skb, info);
 135                 break;
 136         default:
 137                 pr_debug("%s(), unknown event: %s\n", __func__ ,
 138                          ircomm_event[event]);
 139                 ret = -EINVAL;
 140         }
 141         return ret;
 142 }
 143
 144 /*
 145  * Function ircomm_state_waitr (self, event, skb)
 146  *
 147  *    IrCOMM has received an incoming connection request and is awaiting
 148  *    response from the user
 149  */
 150 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
 151                               struct sk_buff *skb, struct ircomm_info *info)
 152 {
 153         int ret = 0;
 154
 155         switch (event) {
 156         case IRCOMM_CONNECT_RESPONSE:
 157                 ircomm_next_state(self, IRCOMM_CONN);
 158                 ret = self->issue.connect_response(self, skb);
 159                 break;
 160         case IRCOMM_DISCONNECT_REQUEST:
 161                 ircomm_next_state(self, IRCOMM_IDLE);
 162                 ret = self->issue.disconnect_request(self, skb, info);
 163                 break;
 164         case IRCOMM_TTP_DISCONNECT_INDICATION:
 165         case IRCOMM_LMP_DISCONNECT_INDICATION:
 166                 ircomm_next_state(self, IRCOMM_IDLE);
 167                 ircomm_disconnect_indication(self, skb, info);
 168                 break;
 169         default:
 170                 pr_debug("%s(), unknown event = %s\n", __func__ ,
 171                          ircomm_event[event]);
 172                 ret = -EINVAL;
 173         }
 174         return ret;
 175 }
 176
 177 /*
 178  * Function ircomm_state_conn (self, event, skb)
 179  *
 180  *    IrCOMM is connected to the peer IrCOMM device
 181  *
 182  */
 183 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
 184                              struct sk_buff *skb, struct ircomm_info *info)
 185 {
 186         int ret = 0;
 187
 188         switch (event) {
 189         case IRCOMM_DATA_REQUEST:
 190                 ret = self->issue.data_request(self, skb, 0);
 191                 break;
 192         case IRCOMM_TTP_DATA_INDICATION:
 193                 ircomm_process_data(self, skb);
 194                 break;
 195         case IRCOMM_LMP_DATA_INDICATION:
 196                 ircomm_data_indication(self, skb);
 197                 break;
 198         case IRCOMM_CONTROL_REQUEST:
 199                 /* Just send a separate frame for now */
 200                 ret = self->issue.data_request(self, skb, skb->len);
 201                 break;
 202         case IRCOMM_TTP_DISCONNECT_INDICATION:
 203         case IRCOMM_LMP_DISCONNECT_INDICATION:
 204                 ircomm_next_state(self, IRCOMM_IDLE);
 205                 ircomm_disconnect_indication(self, skb, info);
 206                 break;
 207         case IRCOMM_DISCONNECT_REQUEST:
 208                 ircomm_next_state(self, IRCOMM_IDLE);
 209                 ret = self->issue.disconnect_request(self, skb, info);
 210                 break;
 211         default:
 212                 pr_debug("%s(), unknown event = %s\n", __func__ ,
 213                          ircomm_event[event]);
 214                 ret = -EINVAL;
 215         }
 216         return ret;
 217 }
 218
 219 /*
 220  * Function ircomm_do_event (self, event, skb)
 221  *
 222  *    Process event
 223  *
 224  */
 225 int ircomm_do_event(struct ircomm_cb *self, IRCOMM_EVENT event,
 226                     struct sk_buff *skb, struct ircomm_info *info)
 227 {
 228         pr_debug("%s: state=%s, event=%s\n", __func__ ,
 229                  ircomm_state[self->state], ircomm_event[event]);
 230
 231         return (*state[self->state])(self, event, skb, info);
 232 }
 233
 234 /*
 235  * Function ircomm_next_state (self, state)
 236  *
 237  *    Switch state
 238  *
 239  */
 240 void ircomm_next_state(struct ircomm_cb *self, IRCOMM_STATE state)
 241 {
 242         self->state = state;
 243
 244         pr_debug("%s: next state=%s, service type=%d\n", __func__ ,
 245                  ircomm_state[self->state], self->service_type);
 246 }