lincan/src/finish.c

   1 /**************************************************************************/
   2 /* File: finish.c - finalization of the driver operations                 */
   3 /*                                                                        */
   4 /* LinCAN - (Not only) Linux CAN bus driver                               */
   5 /* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz>   */
   6 /* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz>             */
   7 /* Funded by OCERA and FRESCOR IST projects                               */
   8 /* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl>      */
   9 /*                                                                        */
  10 /* LinCAN is free software; you can redistribute it and/or modify it      */
  11 /* under terms of the GNU General Public License as published by the      */
  12 /* Free Software Foundation; either version 2, or (at your option) any    */
  13 /* later version.  LinCAN is distributed in the hope that it will be      */
  14 /* useful, but WITHOUT ANY WARRANTY; without even the implied warranty    */
  15 /* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU    */
  16 /* General Public License for more details. You should have received a    */
  17 /* copy of the GNU General Public License along with LinCAN; see file     */
  18 /* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave,  */
  19 /* Cambridge, MA 02139, USA.                                              */
  20 /*                                                                        */
  21 /* To allow use of LinCAN in the compact embedded systems firmware        */
  22 /* and RT-executives (RTEMS for example), main authors agree with next    */
  23 /* special exception:                                                     */
  24 /*                                                                        */
  25 /* Including LinCAN header files in a file, instantiating LinCAN generics */
  26 /* or templates, or linking other files with LinCAN objects to produce    */
  27 /* an application image/executable, does not by itself cause the          */
  28 /* resulting application image/executable to be covered by                */
  29 /* the GNU General Public License.                                        */
  30 /* This exception does not however invalidate any other reasons           */
  31 /* why the executable file might be covered by the GNU Public License.    */
  32 /* Publication of enhanced or derived LinCAN files is required although.  */
  33 /**************************************************************************/
  34
  35 #include "../include/can.h"
  36 #include "../include/can_sysdep.h"
  37 #include "../include/main.h"
  38 #include "../include/devcommon.h"
  39 #include "../include/finish.h"
  40 #include "../include/setup.h"
  41
  42 extern int next_minor;
  43 /**
  44  * msgobj_done - destroys one CAN message object
  45  * @obj: pointer to CAN message object structure
  46  */
  47 void msgobj_done(struct msgobj_t *obj)
  48 {
  49         int delayed=0;
  50         if(obj->qends) {
  51                 delayed=canqueue_ends_done_chip(obj->qends);
  52                 if(delayed < 0)
  53                         CANMSG("msgobj_done: problem with chip queue ends\n");
  54         }
  55
  56         if((obj->hostchip) && (obj->object>0)) {
  57                 if(obj->hostchip->msgobj[obj->object-1] == obj)
  58                         obj->hostchip->msgobj[obj->object-1]=NULL;
  59                 else
  60                         CANMSG("msgobj_done: not registered in the canchip_t\n");
  61                 obj->hostchip=NULL;
  62         }
  63
  64         if((obj->minor>=0)) {
  65                 if(objects_p[obj->minor] == obj){
  66                         objects_p[obj->minor] = NULL;
  67                         if (--next_minor<0)
  68                                 next_minor=0;
  69                 }
  70                 else
  71                         CANMSG("msgobj_done: not registered as minor\n");
  72         }
  73
  74         del_timer_sync(&obj->tx_timeout);
  75
  76         if(obj->qends) {
  77                 /*delayed free could be required there in the future,
  78                   actual use patter cannot generate such situation*/
  79                 if(!delayed) {
  80                         can_checked_free(obj->qends);
  81                 }
  82         }
  83         obj->qends=NULL;
  84 }
  85
  86
  87 /**
  88  * canchip_done - destroys one CAN chip representation
  89  * @chip: pointer to CAN chip structure
  90  */
  91 void canchip_done(struct canchip_t *chip)
  92 {
  93
  94         int i;
  95         struct msgobj_t *obj;
  96
  97         if(chip->flags & CHIP_ATTACHED){
  98                 chip->chipspecops->release_chip(chip);
  99                 chip->flags &= ~CHIP_ATTACHED;
 100         }
 101
 102         if((chip->hostdevice) && (chip->chip_idx>=0)) {
 103                 if(chip->hostdevice->chip[chip->chip_idx] == chip)
 104                         chip->hostdevice->chip[chip->chip_idx] = NULL;
 105                 else
 106                         CANMSG("canchip_done: not registered in hostdevice\n");
 107         }
 108
 109         can_chip_free_irq(chip);
 110
 111         can_synchronize_irq(chip->chip_irq);
 112
 113         for(i=0; i<chip->max_objects; i++){
 114                 if((obj=chip->msgobj[i])==NULL)
 115                         continue;
 116                 msgobj_done(obj);
 117                 can_checked_free(obj);
 118         }
 119
 120         can_checked_free(chip->chipspecops);
 121
 122         if(~chip->flags & CHIP_KEEP_DATA)
 123                 can_checked_free(chip->chip_data);
 124         chip->chip_data = NULL;
 125         chip->chipspecops=NULL;
 126
 127 }
 128
 129 /**
 130  * candevice_done - destroys representation of one CAN device/board
 131  * @candev: pointer to CAN device/board structure
 132  */
 133 void candevice_done(struct candevice_t *candev)
 134 {
 135         int i;
 136         struct canchip_t *chip;
 137
 138         for(i=0; i<candev->nr_all_chips; i++){
 139                 if((chip=candev->chip[i])==NULL)
 140                         continue;
 141                 canchip_done(chip);
 142                 can_checked_free(chip);
 143
 144         }
 145         if(candev->flags & CANDEV_IO_RESERVED) {
 146                 candev->hwspecops->release_io(candev);
 147                 candev->flags &= ~CANDEV_IO_RESERVED;
 148         }
 149         if(candev->hwspecops->done_hw_data != NULL)
 150                 candev->hwspecops->done_hw_data(candev);
 151
 152         can_checked_free(candev->hwspecops);
 153         candev->hwspecops=NULL;
 154 }
 155
 156 /**
 157  * candevice_done - destroys representation of all CAN devices/boards
 158  * @canhw: pointer to the root of all CAN hardware representation
 159  */
 160 void canhardware_done(struct canhardware_t *canhw)
 161 {
 162         int i;
 163         struct candevice_t *candev;
 164
 165         for(i=0; i<MAX_HW_CARDS; i++){
 166                 if((candev=canhw->candevice[i])==NULL)
 167                         continue;
 168                 candevice_done(candev);
 169                 can_checked_free(candev);
 170         }
 171
 172 }