drivers/isdn/mISDN/layer1.c

   1 /*
   2  *
   3  * Author       Karsten Keil <kkeil@novell.com>
   4  *
   5  * Copyright 2008  by Karsten Keil <kkeil@novell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18
  19 #include <linux/module.h>
  20 #include <linux/mISDNhw.h>
  21 #include "core.h"
  22 #include "layer1.h"
  23 #include "fsm.h"
  24
  25 static u_int *debug;
  26
  27 struct layer1 {
  28         u_long                  Flags;
  29         struct FsmInst          l1m;
  30         struct FsmTimer         timer;
  31         int                     delay;
  32         struct dchannel         *dch;
  33         dchannel_l1callback     *dcb;
  34 };
  35
  36 #define TIMER3_VALUE 7000
  37
  38 static
  39 struct Fsm l1fsm_s = {NULL, 0, 0, NULL, NULL};
  40
  41 enum {
  42         ST_L1_F2,
  43         ST_L1_F3,
  44         ST_L1_F4,
  45         ST_L1_F5,
  46         ST_L1_F6,
  47         ST_L1_F7,
  48         ST_L1_F8,
  49 };
  50
  51 #define L1S_STATE_COUNT (ST_L1_F8+1)
  52
  53 static char *strL1SState[] =
  54 {
  55         "ST_L1_F2",
  56         "ST_L1_F3",
  57         "ST_L1_F4",
  58         "ST_L1_F5",
  59         "ST_L1_F6",
  60         "ST_L1_F7",
  61         "ST_L1_F8",
  62 };
  63
  64 enum {
  65         EV_PH_ACTIVATE,
  66         EV_PH_DEACTIVATE,
  67         EV_RESET_IND,
  68         EV_DEACT_CNF,
  69         EV_DEACT_IND,
  70         EV_POWER_UP,
  71         EV_ANYSIG_IND,
  72         EV_INFO2_IND,
  73         EV_INFO4_IND,
  74         EV_TIMER_DEACT,
  75         EV_TIMER_ACT,
  76         EV_TIMER3,
  77 };
  78
  79 #define L1_EVENT_COUNT (EV_TIMER3 + 1)
  80
  81 static char *strL1Event[] =
  82 {
  83         "EV_PH_ACTIVATE",
  84         "EV_PH_DEACTIVATE",
  85         "EV_RESET_IND",
  86         "EV_DEACT_CNF",
  87         "EV_DEACT_IND",
  88         "EV_POWER_UP",
  89         "EV_ANYSIG_IND",
  90         "EV_INFO2_IND",
  91         "EV_INFO4_IND",
  92         "EV_TIMER_DEACT",
  93         "EV_TIMER_ACT",
  94         "EV_TIMER3",
  95 };
  96
  97 static void
  98 l1m_debug(struct FsmInst *fi, char *fmt, ...)
  99 {
 100         struct layer1 *l1 = fi->userdata;
 101         va_list va;
 102
 103         va_start(va, fmt);
 104         printk(KERN_DEBUG "%s: ", l1->dch->dev.name);
 105         vprintk(fmt, va);
 106         printk("\n");
 107         va_end(va);
 108 }
 109
 110 static void
 111 l1_reset(struct FsmInst *fi, int event, void *arg)
 112 {
 113         mISDN_FsmChangeState(fi, ST_L1_F3);
 114 }
 115
 116 static void
 117 l1_deact_cnf(struct FsmInst *fi, int event, void *arg)
 118 {
 119         struct layer1 *l1 = fi->userdata;
 120
 121         mISDN_FsmChangeState(fi, ST_L1_F3);
 122         if (test_bit(FLG_L1_ACTIVATING, &l1->Flags))
 123                 l1->dcb(l1->dch, HW_POWERUP_REQ);
 124 }
 125
 126 static void
 127 l1_deact_req_s(struct FsmInst *fi, int event, void *arg)
 128 {
 129         struct layer1 *l1 = fi->userdata;
 130
 131         mISDN_FsmChangeState(fi, ST_L1_F3);
 132         mISDN_FsmRestartTimer(&l1->timer, 550, EV_TIMER_DEACT, NULL, 2);
 133         test_and_set_bit(FLG_L1_DEACTTIMER, &l1->Flags);
 134 }
 135
 136 static void
 137 l1_power_up_s(struct FsmInst *fi, int event, void *arg)
 138 {
 139         struct layer1 *l1 = fi->userdata;
 140
 141         if (test_bit(FLG_L1_ACTIVATING, &l1->Flags)) {
 142                 mISDN_FsmChangeState(fi, ST_L1_F4);
 143                 l1->dcb(l1->dch, INFO3_P8);
 144         } else
 145                 mISDN_FsmChangeState(fi, ST_L1_F3);
 146 }
 147
 148 static void
 149 l1_go_F5(struct FsmInst *fi, int event, void *arg)
 150 {
 151         mISDN_FsmChangeState(fi, ST_L1_F5);
 152 }
 153
 154 static void
 155 l1_go_F8(struct FsmInst *fi, int event, void *arg)
 156 {
 157         mISDN_FsmChangeState(fi, ST_L1_F8);
 158 }
 159
 160 static void
 161 l1_info2_ind(struct FsmInst *fi, int event, void *arg)
 162 {
 163         struct layer1 *l1 = fi->userdata;
 164
 165         mISDN_FsmChangeState(fi, ST_L1_F6);
 166         l1->dcb(l1->dch, INFO3_P8);
 167 }
 168
 169 static void
 170 l1_info4_ind(struct FsmInst *fi, int event, void *arg)
 171 {
 172         struct layer1 *l1 = fi->userdata;
 173
 174         mISDN_FsmChangeState(fi, ST_L1_F7);
 175         l1->dcb(l1->dch, INFO3_P8);
 176         if (test_and_clear_bit(FLG_L1_DEACTTIMER, &l1->Flags))
 177                 mISDN_FsmDelTimer(&l1->timer, 4);
 178         if (!test_bit(FLG_L1_ACTIVATED, &l1->Flags)) {
 179                 if (test_and_clear_bit(FLG_L1_T3RUN, &l1->Flags))
 180                         mISDN_FsmDelTimer(&l1->timer, 3);
 181                 mISDN_FsmRestartTimer(&l1->timer, 110, EV_TIMER_ACT, NULL, 2);
 182                 test_and_set_bit(FLG_L1_ACTTIMER, &l1->Flags);
 183         }
 184 }
 185
 186 static void
 187 l1_timer3(struct FsmInst *fi, int event, void *arg)
 188 {
 189         struct layer1 *l1 = fi->userdata;
 190
 191         test_and_clear_bit(FLG_L1_T3RUN, &l1->Flags);
 192         if (test_and_clear_bit(FLG_L1_ACTIVATING, &l1->Flags)) {
 193                 if (test_and_clear_bit(FLG_L1_DBLOCKED, &l1->Flags))
 194                         l1->dcb(l1->dch, HW_D_NOBLOCKED);
 195                 l1->dcb(l1->dch, PH_DEACTIVATE_IND);
 196         }
 197         if (l1->l1m.state != ST_L1_F6) {
 198                 mISDN_FsmChangeState(fi, ST_L1_F3);
 199                 l1->dcb(l1->dch, HW_POWERUP_REQ);
 200         }
 201 }
 202
 203 static void
 204 l1_timer_act(struct FsmInst *fi, int event, void *arg)
 205 {
 206         struct layer1 *l1 = fi->userdata;
 207
 208         test_and_clear_bit(FLG_L1_ACTTIMER, &l1->Flags);
 209         test_and_set_bit(FLG_L1_ACTIVATED, &l1->Flags);
 210         l1->dcb(l1->dch, PH_ACTIVATE_IND);
 211 }
 212
 213 static void
 214 l1_timer_deact(struct FsmInst *fi, int event, void *arg)
 215 {
 216         struct layer1 *l1 = fi->userdata;
 217
 218         test_and_clear_bit(FLG_L1_DEACTTIMER, &l1->Flags);
 219         test_and_clear_bit(FLG_L1_ACTIVATED, &l1->Flags);
 220         if (test_and_clear_bit(FLG_L1_DBLOCKED, &l1->Flags))
 221                 l1->dcb(l1->dch, HW_D_NOBLOCKED);
 222         l1->dcb(l1->dch, PH_DEACTIVATE_IND);
 223         l1->dcb(l1->dch, HW_DEACT_REQ);
 224 }
 225
 226 static void
 227 l1_activate_s(struct FsmInst *fi, int event, void *arg)
 228 {
 229         struct layer1 *l1 = fi->userdata;
 230
 231         mISDN_FsmRestartTimer(&l1->timer, TIMER3_VALUE, EV_TIMER3, NULL, 2);
 232         test_and_set_bit(FLG_L1_T3RUN, &l1->Flags);
 233         l1->dcb(l1->dch, HW_RESET_REQ);
 234 }
 235
 236 static void
 237 l1_activate_no(struct FsmInst *fi, int event, void *arg)
 238 {
 239         struct layer1 *l1 = fi->userdata;
 240
 241         if ((!test_bit(FLG_L1_DEACTTIMER, &l1->Flags)) &&
 242             (!test_bit(FLG_L1_T3RUN, &l1->Flags))) {
 243                 test_and_clear_bit(FLG_L1_ACTIVATING, &l1->Flags);
 244                 if (test_and_clear_bit(FLG_L1_DBLOCKED, &l1->Flags))
 245                         l1->dcb(l1->dch, HW_D_NOBLOCKED);
 246                 l1->dcb(l1->dch, PH_DEACTIVATE_IND);
 247         }
 248 }
 249
 250 static struct FsmNode L1SFnList[] =
 251 {
 252         {ST_L1_F3, EV_PH_ACTIVATE, l1_activate_s},
 253         {ST_L1_F6, EV_PH_ACTIVATE, l1_activate_no},
 254         {ST_L1_F8, EV_PH_ACTIVATE, l1_activate_no},
 255         {ST_L1_F3, EV_RESET_IND, l1_reset},
 256         {ST_L1_F4, EV_RESET_IND, l1_reset},
 257         {ST_L1_F5, EV_RESET_IND, l1_reset},
 258         {ST_L1_F6, EV_RESET_IND, l1_reset},
 259         {ST_L1_F7, EV_RESET_IND, l1_reset},
 260         {ST_L1_F8, EV_RESET_IND, l1_reset},
 261         {ST_L1_F3, EV_DEACT_CNF, l1_deact_cnf},
 262         {ST_L1_F4, EV_DEACT_CNF, l1_deact_cnf},
 263         {ST_L1_F5, EV_DEACT_CNF, l1_deact_cnf},
 264         {ST_L1_F6, EV_DEACT_CNF, l1_deact_cnf},
 265         {ST_L1_F7, EV_DEACT_CNF, l1_deact_cnf},
 266         {ST_L1_F8, EV_DEACT_CNF, l1_deact_cnf},
 267         {ST_L1_F6, EV_DEACT_IND, l1_deact_req_s},
 268         {ST_L1_F7, EV_DEACT_IND, l1_deact_req_s},
 269         {ST_L1_F8, EV_DEACT_IND, l1_deact_req_s},
 270         {ST_L1_F3, EV_POWER_UP,  l1_power_up_s},
 271         {ST_L1_F4, EV_ANYSIG_IND, l1_go_F5},
 272         {ST_L1_F6, EV_ANYSIG_IND, l1_go_F8},
 273         {ST_L1_F7, EV_ANYSIG_IND, l1_go_F8},
 274         {ST_L1_F3, EV_INFO2_IND, l1_info2_ind},
 275         {ST_L1_F4, EV_INFO2_IND, l1_info2_ind},
 276         {ST_L1_F5, EV_INFO2_IND, l1_info2_ind},
 277         {ST_L1_F7, EV_INFO2_IND, l1_info2_ind},
 278         {ST_L1_F8, EV_INFO2_IND, l1_info2_ind},
 279         {ST_L1_F3, EV_INFO4_IND, l1_info4_ind},
 280         {ST_L1_F4, EV_INFO4_IND, l1_info4_ind},
 281         {ST_L1_F5, EV_INFO4_IND, l1_info4_ind},
 282         {ST_L1_F6, EV_INFO4_IND, l1_info4_ind},
 283         {ST_L1_F8, EV_INFO4_IND, l1_info4_ind},
 284         {ST_L1_F3, EV_TIMER3, l1_timer3},
 285         {ST_L1_F4, EV_TIMER3, l1_timer3},
 286         {ST_L1_F5, EV_TIMER3, l1_timer3},
 287         {ST_L1_F6, EV_TIMER3, l1_timer3},
 288         {ST_L1_F8, EV_TIMER3, l1_timer3},
 289         {ST_L1_F7, EV_TIMER_ACT, l1_timer_act},
 290         {ST_L1_F3, EV_TIMER_DEACT, l1_timer_deact},
 291         {ST_L1_F4, EV_TIMER_DEACT, l1_timer_deact},
 292         {ST_L1_F5, EV_TIMER_DEACT, l1_timer_deact},
 293         {ST_L1_F6, EV_TIMER_DEACT, l1_timer_deact},
 294         {ST_L1_F7, EV_TIMER_DEACT, l1_timer_deact},
 295         {ST_L1_F8, EV_TIMER_DEACT, l1_timer_deact},
 296 };
 297
 298 static void
 299 release_l1(struct layer1 *l1) {
 300         mISDN_FsmDelTimer(&l1->timer, 0);
 301         if (l1->dch)
 302                 l1->dch->l1 = NULL;
 303         module_put(THIS_MODULE);
 304         kfree(l1);
 305 }
 306
 307 int
 308 l1_event(struct layer1 *l1, u_int event)
 309 {
 310         int             err = 0;
 311
 312         if (!l1)
 313                 return -EINVAL;
 314         switch (event) {
 315         case HW_RESET_IND:
 316                 mISDN_FsmEvent(&l1->l1m, EV_RESET_IND, NULL);
 317                 break;
 318         case HW_DEACT_IND:
 319                 mISDN_FsmEvent(&l1->l1m, EV_DEACT_IND, NULL);
 320                 break;
 321         case HW_POWERUP_IND:
 322                 mISDN_FsmEvent(&l1->l1m, EV_POWER_UP, NULL);
 323                 break;
 324         case HW_DEACT_CNF:
 325                 mISDN_FsmEvent(&l1->l1m, EV_DEACT_CNF, NULL);
 326                 break;
 327         case ANYSIGNAL:
 328                 mISDN_FsmEvent(&l1->l1m, EV_ANYSIG_IND, NULL);
 329                 break;
 330         case LOSTFRAMING:
 331                 mISDN_FsmEvent(&l1->l1m, EV_ANYSIG_IND, NULL);
 332                 break;
 333         case INFO2:
 334                 mISDN_FsmEvent(&l1->l1m, EV_INFO2_IND, NULL);
 335                 break;
 336         case INFO4_P8:
 337                 mISDN_FsmEvent(&l1->l1m, EV_INFO4_IND, NULL);
 338                 break;
 339         case INFO4_P10:
 340                 mISDN_FsmEvent(&l1->l1m, EV_INFO4_IND, NULL);
 341                 break;
 342         case PH_ACTIVATE_REQ:
 343                 if (test_bit(FLG_L1_ACTIVATED, &l1->Flags))
 344                         l1->dcb(l1->dch, PH_ACTIVATE_IND);
 345                 else {
 346                         test_and_set_bit(FLG_L1_ACTIVATING, &l1->Flags);
 347                         mISDN_FsmEvent(&l1->l1m, EV_PH_ACTIVATE, NULL);
 348                 }
 349                 break;
 350         case CLOSE_CHANNEL:
 351                 release_l1(l1);
 352                 break;
 353         default:
 354                 if (*debug & DEBUG_L1)
 355                         printk(KERN_DEBUG "%s %x unhandled\n",
 356                             __func__, event);
 357                 err = -EINVAL;
 358         }
 359         return err;
 360 }
 361 EXPORT_SYMBOL(l1_event);
 362
 363 int
 364 create_l1(struct dchannel *dch, dchannel_l1callback *dcb) {
 365         struct layer1   *nl1;
 366
 367         nl1 = kzalloc(sizeof(struct layer1), GFP_ATOMIC);
 368         if (!nl1) {
 369                 printk(KERN_ERR "kmalloc struct layer1 failed\n");
 370                 return -ENOMEM;
 371         }
 372         nl1->l1m.fsm = &l1fsm_s;
 373         nl1->l1m.state = ST_L1_F3;
 374         nl1->Flags = 0;
 375         nl1->l1m.debug = *debug & DEBUG_L1_FSM;
 376         nl1->l1m.userdata = nl1;
 377         nl1->l1m.userint = 0;
 378         nl1->l1m.printdebug = l1m_debug;
 379         nl1->dch = dch;
 380         nl1->dcb = dcb;
 381         mISDN_FsmInitTimer(&nl1->l1m, &nl1->timer);
 382         __module_get(THIS_MODULE);
 383         dch->l1 = nl1;
 384         return 0;
 385 }
 386 EXPORT_SYMBOL(create_l1);
 387
 388 int
 389 l1_init(u_int *deb)
 390 {
 391         debug = deb;
 392         l1fsm_s.state_count = L1S_STATE_COUNT;
 393         l1fsm_s.event_count = L1_EVENT_COUNT;
 394         l1fsm_s.strEvent = strL1Event;
 395         l1fsm_s.strState = strL1SState;
 396         mISDN_FsmNew(&l1fsm_s, L1SFnList, ARRAY_SIZE(L1SFnList));
 397         return 0;
 398 }
 399
 400 void
 401 l1_cleanup(void)
 402 {
 403         mISDN_FsmFree(&l1fsm_s);
 404 }