common/iomux.c

   1 /*
   2  * (C) Copyright 2008
   3  * Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <serial.h>
  26 #include <malloc.h>
  27
  28 #ifdef CONFIG_CONSOLE_MUX
  29 void iomux_printdevs(const int console)
  30 {
  31         int i;
  32         struct stdio_dev *dev;
  33
  34         for (i = 0; i < cd_count[console]; i++) {
  35                 dev = console_devices[console][i];
  36                 printf("%s ", dev->name);
  37         }
  38         printf("\n");
  39 }
  40
  41 /* This tries to preserve the old list if an error occurs. */
  42 int iomux_doenv(const int console, const char *arg)
  43 {
  44         char *console_args, *temp, **start;
  45         int i, j, k, io_flag, cs_idx, repeat;
  46         struct stdio_dev *dev;
  47         struct stdio_dev **cons_set;
  48
  49         console_args = strdup(arg);
  50         if (console_args == NULL)
  51                 return 1;
  52         /*
  53          * Check whether a comma separated list of devices was
  54          * entered and count how many devices were entered.
  55          * The array start[] has pointers to the beginning of
  56          * each device name (up to MAX_CONSARGS devices).
  57          *
  58          * Have to do this twice - once to count the number of
  59          * commas and then again to populate start.
  60          */
  61         i = 0;
  62         temp = console_args;
  63         for (;;) {
  64                 temp = strchr(temp, ',');
  65                 if (temp != NULL) {
  66                         i++;
  67                         temp++;
  68                         continue;
  69                 }
  70                 /* There's always one entry more than the number of commas. */
  71                 i++;
  72                 break;
  73         }
  74         start = (char **)malloc(i * sizeof(char *));
  75         if (start == NULL) {
  76                 free(console_args);
  77                 return 1;
  78         }
  79         i = 0;
  80         start[0] = console_args;
  81         for (;;) {
  82                 temp = strchr(start[i++], ',');
  83                 if (temp == NULL)
  84                         break;
  85                 *temp = '\0';
  86                 start[i] = temp + 1;
  87         }
  88         cons_set = (struct stdio_dev **)calloc(i, sizeof(struct stdio_dev *));
  89         if (cons_set == NULL) {
  90                 free(start);
  91                 free(console_args);
  92                 return 1;
  93         }
  94
  95         switch (console) {
  96         case stdin:
  97                 io_flag = DEV_FLAGS_INPUT;
  98                 break;
  99         case stdout:
 100         case stderr:
 101                 io_flag = DEV_FLAGS_OUTPUT;
 102                 break;
 103         default:
 104                 free(start);
 105                 free(console_args);
 106                 free(cons_set);
 107                 return 1;
 108         }
 109
 110         cs_idx = 0;
 111         for (j = 0; j < i; j++) {
 112                 /*
 113                  * Check whether the device exists and is valid.
 114                  * console_assign() also calls search_device(),
 115                  * but I need the pointer to the device.
 116                  */
 117                 dev = search_device(io_flag, start[j]);
 118                 if (dev == NULL)
 119                         continue;
 120                 /*
 121                  * Prevent multiple entries for a device.
 122                  */
 123                  repeat = 0;
 124                  for (k = 0; k < cs_idx; k++) {
 125                         if (dev == cons_set[k]) {
 126                                 repeat++;
 127                                 break;
 128                         }
 129                  }
 130                  if (repeat)
 131                         continue;
 132                 /*
 133                  * Try assigning the specified device.
 134                  * This could screw up the console settings for apps.
 135                  */
 136                 if (console_assign(console, start[j]) < 0)
 137                         continue;
 138 #ifdef CONFIG_SERIAL_MULTI
 139                 /*
 140                  * This was taken from common/cmd_nvedit.c.
 141                  * This will never work because serial_assign() returns
 142                  * 1 upon error, not -1.
 143                  * This would almost always return an error anyway because
 144                  * serial_assign() expects the name of a serial device, like
 145                  * serial_smc, but the user generally only wants to set serial.
 146                  */
 147                 if (serial_assign(start[j]) < 0)
 148                         continue;
 149 #endif
 150                 cons_set[cs_idx++] = dev;
 151         }
 152         free(console_args);
 153         free(start);
 154         /* failed to set any console */
 155         if (cs_idx == 0) {
 156                 free(cons_set);
 157                 return 1;
 158         } else {
 159                 /* Works even if console_devices[console] is NULL. */
 160                 console_devices[console] =
 161                         (struct stdio_dev **)realloc(console_devices[console],
 162                         cs_idx * sizeof(struct stdio_dev *));
 163                 if (console_devices[console] == NULL) {
 164                         free(cons_set);
 165                         return 1;
 166                 }
 167                 memcpy(console_devices[console], cons_set, cs_idx *
 168                         sizeof(struct stdio_dev *));
 169
 170                 cd_count[console] = cs_idx;
 171         }
 172         free(cons_set);
 173         return 0;
 174 }
 175 #endif /* CONFIG_CONSOLE_MUX */