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, write to the Free Software
  26  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  *     MA 02111-1307 USA
  28  *
  29  ********************************************************************/
  30
  31 #include <linux/proc_fs.h>
  32 #include <linux/init.h>
  33
  34 #include <net/irda/irda.h>
  35 #include <net/irda/irlmp.h>
  36 #include <net/irda/iriap.h>
  37 #include <net/irda/irttp.h>
  38 #include <net/irda/irias_object.h>
  39
  40 #include <net/irda/ircomm_core.h>
  41 #include <net/irda/ircomm_event.h>
  42
  43 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
  44                              struct sk_buff *skb, struct ircomm_info *info);
  45 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
  46                               struct sk_buff *skb, struct ircomm_info *info);
  47 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
  48                               struct sk_buff *skb, struct ircomm_info *info);
  49 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
  50                              struct sk_buff *skb, struct ircomm_info *info);
  51
  52 const char *const ircomm_state[] = {
  53         "IRCOMM_IDLE",
  54         "IRCOMM_WAITI",
  55         "IRCOMM_WAITR",
  56         "IRCOMM_CONN",
  57 };
  58
  59 #ifdef CONFIG_IRDA_DEBUG
  60 static const char *const ircomm_event[] = {
  61         "IRCOMM_CONNECT_REQUEST",
  62         "IRCOMM_CONNECT_RESPONSE",
  63         "IRCOMM_TTP_CONNECT_INDICATION",
  64         "IRCOMM_LMP_CONNECT_INDICATION",
  65         "IRCOMM_TTP_CONNECT_CONFIRM",
  66         "IRCOMM_LMP_CONNECT_CONFIRM",
  67
  68         "IRCOMM_LMP_DISCONNECT_INDICATION",
  69         "IRCOMM_TTP_DISCONNECT_INDICATION",
  70         "IRCOMM_DISCONNECT_REQUEST",
  71
  72         "IRCOMM_TTP_DATA_INDICATION",
  73         "IRCOMM_LMP_DATA_INDICATION",
  74         "IRCOMM_DATA_REQUEST",
  75         "IRCOMM_CONTROL_REQUEST",
  76         "IRCOMM_CONTROL_INDICATION",
  77 };
  78 #endif /* CONFIG_IRDA_DEBUG */
  79
  80 static int (*state[])(struct ircomm_cb *self, IRCOMM_EVENT event,
  81                       struct sk_buff *skb, struct ircomm_info *info) =
  82 {
  83         ircomm_state_idle,
  84         ircomm_state_waiti,
  85         ircomm_state_waitr,
  86         ircomm_state_conn,
  87 };
  88
  89 /*
  90  * Function ircomm_state_idle (self, event, skb)
  91  *
  92  *    IrCOMM is currently idle
  93  *
  94  */
  95 static int ircomm_state_idle(struct ircomm_cb *self, IRCOMM_EVENT event,
  96                              struct sk_buff *skb, struct ircomm_info *info)
  97 {
  98         int ret = 0;
  99
 100         switch (event) {
 101         case IRCOMM_CONNECT_REQUEST:
 102                 ircomm_next_state(self, IRCOMM_WAITI);
 103                 ret = self->issue.connect_request(self, skb, info);
 104                 break;
 105         case IRCOMM_TTP_CONNECT_INDICATION:
 106         case IRCOMM_LMP_CONNECT_INDICATION:
 107                 ircomm_next_state(self, IRCOMM_WAITR);
 108                 ircomm_connect_indication(self, skb, info);
 109                 break;
 110         default:
 111                 IRDA_DEBUG(4, "%s(), unknown event: %s\n", __func__ ,
 112                            ircomm_event[event]);
 113                 ret = -EINVAL;
 114         }
 115         return ret;
 116 }
 117
 118 /*
 119  * Function ircomm_state_waiti (self, event, skb)
 120  *
 121  *    The IrCOMM user has requested an IrCOMM connection to the remote
 122  *    device and is awaiting confirmation
 123  */
 124 static int ircomm_state_waiti(struct ircomm_cb *self, IRCOMM_EVENT event,
 125                               struct sk_buff *skb, struct ircomm_info *info)
 126 {
 127         int ret = 0;
 128
 129         switch (event) {
 130         case IRCOMM_TTP_CONNECT_CONFIRM:
 131         case IRCOMM_LMP_CONNECT_CONFIRM:
 132                 ircomm_next_state(self, IRCOMM_CONN);
 133                 ircomm_connect_confirm(self, skb, info);
 134                 break;
 135         case IRCOMM_TTP_DISCONNECT_INDICATION:
 136         case IRCOMM_LMP_DISCONNECT_INDICATION:
 137                 ircomm_next_state(self, IRCOMM_IDLE);
 138                 ircomm_disconnect_indication(self, skb, info);
 139                 break;
 140         default:
 141                 IRDA_DEBUG(0, "%s(), unknown event: %s\n", __func__ ,
 142                            ircomm_event[event]);
 143                 ret = -EINVAL;
 144         }
 145         return ret;
 146 }
 147
 148 /*
 149  * Function ircomm_state_waitr (self, event, skb)
 150  *
 151  *    IrCOMM has received an incoming connection request and is awaiting
 152  *    response from the user
 153  */
 154 static int ircomm_state_waitr(struct ircomm_cb *self, IRCOMM_EVENT event,
 155                               struct sk_buff *skb, struct ircomm_info *info)
 156 {
 157         int ret = 0;
 158
 159         switch (event) {
 160         case IRCOMM_CONNECT_RESPONSE:
 161                 ircomm_next_state(self, IRCOMM_CONN);
 162                 ret = self->issue.connect_response(self, skb);
 163                 break;
 164         case IRCOMM_DISCONNECT_REQUEST:
 165                 ircomm_next_state(self, IRCOMM_IDLE);
 166                 ret = self->issue.disconnect_request(self, skb, info);
 167                 break;
 168         case IRCOMM_TTP_DISCONNECT_INDICATION:
 169         case IRCOMM_LMP_DISCONNECT_INDICATION:
 170                 ircomm_next_state(self, IRCOMM_IDLE);
 171                 ircomm_disconnect_indication(self, skb, info);
 172                 break;
 173         default:
 174                 IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
 175                            ircomm_event[event]);
 176                 ret = -EINVAL;
 177         }
 178         return ret;
 179 }
 180
 181 /*
 182  * Function ircomm_state_conn (self, event, skb)
 183  *
 184  *    IrCOMM is connected to the peer IrCOMM device
 185  *
 186  */
 187 static int ircomm_state_conn(struct ircomm_cb *self, IRCOMM_EVENT event,
 188                              struct sk_buff *skb, struct ircomm_info *info)
 189 {
 190         int ret = 0;
 191
 192         switch (event) {
 193         case IRCOMM_DATA_REQUEST:
 194                 ret = self->issue.data_request(self, skb, 0);
 195                 break;
 196         case IRCOMM_TTP_DATA_INDICATION:
 197                 ircomm_process_data(self, skb);
 198                 break;
 199         case IRCOMM_LMP_DATA_INDICATION:
 200                 ircomm_data_indication(self, skb);
 201                 break;
 202         case IRCOMM_CONTROL_REQUEST:
 203                 /* Just send a separate frame for now */
 204                 ret = self->issue.data_request(self, skb, skb->len);
 205                 break;
 206         case IRCOMM_TTP_DISCONNECT_INDICATION:
 207         case IRCOMM_LMP_DISCONNECT_INDICATION:
 208                 ircomm_next_state(self, IRCOMM_IDLE);
 209                 ircomm_disconnect_indication(self, skb, info);
 210                 break;
 211         case IRCOMM_DISCONNECT_REQUEST:
 212                 ircomm_next_state(self, IRCOMM_IDLE);
 213                 ret = self->issue.disconnect_request(self, skb, info);
 214                 break;
 215         default:
 216                 IRDA_DEBUG(0, "%s(), unknown event = %s\n", __func__ ,
 217                            ircomm_event[event]);
 218                 ret = -EINVAL;
 219         }
 220         return ret;
 221 }
 222
 223 /*
 224  * Function ircomm_do_event (self, event, skb)
 225  *
 226  *    Process event
 227  *
 228  */
 229 int ircomm_do_event(struct ircomm_cb *self, IRCOMM_EVENT event,
 230                     struct sk_buff *skb, struct ircomm_info *info)
 231 {
 232         IRDA_DEBUG(4, "%s: state=%s, event=%s\n", __func__ ,
 233                    ircomm_state[self->state], ircomm_event[event]);
 234
 235         return (*state[self->state])(self, event, skb, info);
 236 }
 237
 238 /*
 239  * Function ircomm_next_state (self, state)
 240  *
 241  *    Switch state
 242  *
 243  */
 244 void ircomm_next_state(struct ircomm_cb *self, IRCOMM_STATE state)
 245 {
 246         self->state = state;
 247
 248         IRDA_DEBUG(4, "%s: next state=%s, service type=%d\n", __func__ ,
 249                    ircomm_state[self->state], self->service_type);
 250 }