common/iomux.c

   1 /*
   2  * (C) Copyright 2008
   3  * Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <serial.h>
  10 #include <malloc.h>
  11
  12 #ifdef CONFIG_CONSOLE_MUX
  13 void iomux_printdevs(const int console)
  14 {
  15         int i;
  16         struct stdio_dev *dev;
  17
  18         for (i = 0; i < cd_count[console]; i++) {
  19                 dev = console_devices[console][i];
  20                 printf("%s ", dev->name);
  21         }
  22         printf("\n");
  23 }
  24
  25 /* This tries to preserve the old list if an error occurs. */
  26 int iomux_doenv(const int console, const char *arg)
  27 {
  28         char *console_args, *temp, **start;
  29         int i, j, k, io_flag, cs_idx, repeat;
  30         struct stdio_dev *dev;
  31         struct stdio_dev **cons_set;
  32
  33         console_args = strdup(arg);
  34         if (console_args == NULL)
  35                 return 1;
  36         /*
  37          * Check whether a comma separated list of devices was
  38          * entered and count how many devices were entered.
  39          * The array start[] has pointers to the beginning of
  40          * each device name (up to MAX_CONSARGS devices).
  41          *
  42          * Have to do this twice - once to count the number of
  43          * commas and then again to populate start.
  44          */
  45         i = 0;
  46         temp = console_args;
  47         for (;;) {
  48                 temp = strchr(temp, ',');
  49                 if (temp != NULL) {
  50                         i++;
  51                         temp++;
  52                         continue;
  53                 }
  54                 /* There's always one entry more than the number of commas. */
  55                 i++;
  56                 break;
  57         }
  58         start = (char **)malloc(i * sizeof(char *));
  59         if (start == NULL) {
  60                 free(console_args);
  61                 return 1;
  62         }
  63         i = 0;
  64         start[0] = console_args;
  65         for (;;) {
  66                 temp = strchr(start[i++], ',');
  67                 if (temp == NULL)
  68                         break;
  69                 *temp = '\0';
  70                 start[i] = temp + 1;
  71         }
  72         cons_set = (struct stdio_dev **)calloc(i, sizeof(struct stdio_dev *));
  73         if (cons_set == NULL) {
  74                 free(start);
  75                 free(console_args);
  76                 return 1;
  77         }
  78
  79         switch (console) {
  80         case stdin:
  81                 io_flag = DEV_FLAGS_INPUT;
  82                 break;
  83         case stdout:
  84         case stderr:
  85                 io_flag = DEV_FLAGS_OUTPUT;
  86                 break;
  87         default:
  88                 free(start);
  89                 free(console_args);
  90                 free(cons_set);
  91                 return 1;
  92         }
  93
  94         cs_idx = 0;
  95         for (j = 0; j < i; j++) {
  96                 /*
  97                  * Check whether the device exists and is valid.
  98                  * console_assign() also calls search_device(),
  99                  * but I need the pointer to the device.
 100                  */
 101                 dev = search_device(io_flag, start[j]);
 102                 if (dev == NULL)
 103                         continue;
 104                 /*
 105                  * Prevent multiple entries for a device.
 106                  */
 107                  repeat = 0;
 108                  for (k = 0; k < cs_idx; k++) {
 109                         if (dev == cons_set[k]) {
 110                                 repeat++;
 111                                 break;
 112                         }
 113                  }
 114                  if (repeat)
 115                         continue;
 116                 /*
 117                  * Try assigning the specified device.
 118                  * This could screw up the console settings for apps.
 119                  */
 120                 if (console_assign(console, start[j]) < 0)
 121                         continue;
 122                 cons_set[cs_idx++] = dev;
 123         }
 124         free(console_args);
 125         free(start);
 126         /* failed to set any console */
 127         if (cs_idx == 0) {
 128                 free(cons_set);
 129                 return 1;
 130         } else {
 131                 /* Works even if console_devices[console] is NULL. */
 132                 console_devices[console] =
 133                         (struct stdio_dev **)realloc(console_devices[console],
 134                         cs_idx * sizeof(struct stdio_dev *));
 135                 if (console_devices[console] == NULL) {
 136                         free(cons_set);
 137                         return 1;
 138                 }
 139                 memcpy(console_devices[console], cons_set, cs_idx *
 140                         sizeof(struct stdio_dev *));
 141
 142                 cd_count[console] = cs_idx;
 143         }
 144         free(cons_set);
 145         return 0;
 146 }
 147 #endif /* CONFIG_CONSOLE_MUX */