lincan/src/devcommon.c

   1 /* devcommon.c - common device code
   2  * Linux CAN-bus device driver.
   3  * New CAN queues by Pavel Pisa - OCERA team member
   4  * email:pisa@cmp.felk.cvut.cz
   5  * This software is released under the GPL-License.
   6  * Version lincan-0.2  9 Jul 2003
   7  */
   8
   9 #include "../include/can.h"
  10 #include "../include/can_sysdep.h"
  11 #include "../include/can_queue.h"
  12 #include "../include/main.h"
  13 #include "../include/devcommon.h"
  14
  15 /**
  16  * canqueue_notify_chip - notification callback handler for CAN chips ends of queues
  17  * @qends: pointer to the callback side ends structure
  18  * @qedge: edge which invoked notification
  19  * @what: notification type
  20  *
  21  * This function has to deal with more possible cases. It can be called from
  22  * the kernel or interrupt context for Linux only compilation of driver.
  23  * The function can be called from kernel context or RT-Linux thread context
  24  * for mixed mode Linux/RT-Linux compilation.
  25  */
  26 void canqueue_notify_chip(struct canque_ends_t *qends, struct canque_edge_t *qedge, int what)
  27 {
  28         struct chip_t *chip=qends->endinfo.chipinfo.chip;
  29         struct msgobj_t *obj=qends->endinfo.chipinfo.msgobj;
  30
  31         DEBUGMSG("canqueue_notify_chip for edge %d and event %d\n",qedge->edge_num,what);
  32         switch(what){
  33                 /*case CANQUEUE_NOTIFY_EMPTY:*/
  34                 /*case CANQUEUE_NOTIFY_SPACE:*/
  35                 /*case CANQUEUE_NOTIFY_NOUSR:
  36                         wake_up(&qends->endinfo.chipinfo.daemonq);
  37                         break;*/
  38                 case CANQUEUE_NOTIFY_PROC:
  39                     #ifndef CAN_WITH_RTL
  40                         /*wake_up(&qends->endinfo.chipinfo.daemonq);*/
  41                         chip->chipspecops->wakeup_tx(chip, obj);
  42                     #else /*CAN_WITH_RTL*/
  43                         can_msgobj_set_fl(obj,TX_REQUEST);
  44                         if(qends->endinfo.chipinfo.worker_thread){
  45                                 can_msgobj_set_fl(obj,WORKER_WAKE);
  46                                 pthread_kill(qends->endinfo.chipinfo.worker_thread,RTL_SIGNAL_WAKEUP);
  47                                 rtl_schedule();
  48                         } else {
  49                                 set_bit(MSGOBJ_TX_REQUEST_b,&chip->pend_flags);
  50
  51                                 if(chip->worker_thread) {
  52                                         set_bit(MSGOBJ_WORKER_WAKE_b,&chip->pend_flags);
  53                                         pthread_kill(chip->worker_thread,RTL_SIGNAL_WAKEUP);
  54                                         rtl_schedule();
  55                                 }
  56                         }
  57                     #endif /*CAN_WITH_RTL*/
  58                         break;
  59                 case CANQUEUE_NOTIFY_DEAD_WANTED:
  60                 case CANQUEUE_NOTIFY_DEAD:
  61                         if(canque_fifo_test_and_clear_fl(&qedge->fifo, READY))
  62                                 canque_edge_decref(qedge);
  63                         break;
  64                 case CANQUEUE_NOTIFY_ATTACH:
  65                         break;
  66         }
  67 }
  68
  69
  70 /**
  71  * canqueue_ends_init_chip - CAN chip specific ends initialization
  72  * @qends: pointer to the ends structure
  73  * @chip: pointer to the corresponding CAN chip structure
  74  * @obj: pointer to the corresponding message object structure
  75  */
  76 int canqueue_ends_init_chip(struct canque_ends_t *qends, struct chip_t *chip, struct msgobj_t *obj)
  77 {
  78         int ret;
  79         ret=canqueue_ends_init_gen(qends);
  80         if(ret<0) return ret;
  81
  82         qends->context=NULL;
  83     #ifndef CAN_WITH_RTL
  84         init_waitqueue_head(&qends->endinfo.chipinfo.daemonq);
  85     #endif /*CAN_WITH_RTL*/
  86         qends->endinfo.chipinfo.chip=chip;
  87         qends->endinfo.chipinfo.msgobj=obj;
  88         qends->notify=canqueue_notify_chip;
  89
  90         DEBUGMSG("canqueue_ends_init_chip\n");
  91         return 0;
  92 }
  93
  94
  95 /**
  96  * canqueue_ends_done_chip - finalizing of the ends structure for CAN chips
  97  * @qends: pointer to ends structure
  98  *
  99  * Return Value: Function should be designed such way to not fail.
 100  */
 101 int canqueue_ends_done_chip(struct canque_ends_t *qends)
 102 {
 103         int delayed;
 104
 105         /* Finish or kill all outgoing edges listed in inends */
 106         delayed=canqueue_ends_kill_inlist(qends, 1);
 107         /* Kill all incoming edges listed in outends */
 108         delayed|=canqueue_ends_kill_outlist(qends);
 109
 110         return delayed;
 111 }