git.sur5r.net Git - cc65/blob - libsrc/serial/ser_load.c

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                ser_load.c                                 */
   4 /*                                                                           */
   5 /*                     Loader module for serial drivers                      */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2003      Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 52                                             */
  11 /*               D-70794 Filderstadt                                         */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <fcntl.h>
  39 #include <modload.h>
  40 #include <serial.h>
  41
  42
  43
  44 /*****************************************************************************/
  45 /*                                   Data                                    */
  46 /*****************************************************************************/
  47
  48
  49
  50 /* Pointer to serial driver, exported from ser-kernel.s */
  51 extern void* ser_drv;
  52
  53
  54
  55 /*****************************************************************************/
  56 /*                                   Code                                    */
  57 /*****************************************************************************/
  58
  59
  60
  61 unsigned char __fastcall__ ser_load_driver (const char* name)
  62 /* Load a serial driver and return an error code */
  63 {
  64     static struct mod_ctrl ctrl = {
  65         read            /* Read from disk */
  66     };
  67     unsigned char Res;
  68
  69     /* Check if we do already have a driver loaded. If so, remove it. */
  70     if (ser_drv != 0) {
  71         ser_uninstall ();
  72     }
  73
  74     /* Now open the file */
  75     ctrl.callerdata = open (name, O_RDONLY);
  76     if (ctrl.callerdata >= 0) {
  77
  78         /* Load the module */
  79         Res = mod_load (&ctrl);
  80
  81         /* Close the input file */
  82         close (ctrl.callerdata);
  83
  84         /* Check the return code */
  85         if (Res == MLOAD_OK) {
  86
  87             /* Check the driver signature, install the driver */
  88             return ser_install (ctrl.module);
  89
  90         }
  91     }
  92
  93     /* Error loading the driver */
  94     return SER_ERR_CANNOT_LOAD;
  95 }
  96
  97
  98