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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008
* Gary Jennejohn, DENX Software Engineering GmbH, garyj@denx.de.
*/
#include <common.h>
#include <console.h>
#include <serial.h>
#include <malloc.h>
#if CONFIG_IS_ENABLED(CONSOLE_MUX)
void iomux_printdevs(const int console)
{
int i;
struct stdio_dev *dev;
for_each_console_dev(i, console, dev)
printf("%s ", dev->name);
printf("\n");
}
int iomux_match_device(struct stdio_dev **set, const int n, struct stdio_dev *sdev)
{
int i;
for (i = 0; i < n; i++)
if (sdev == set[i])
return i;
return -ENOENT;
}
/* This tries to preserve the old list if an error occurs. */
int iomux_doenv(const int console, const char *arg)
{
char *console_args, *temp, **start;
int i, j, io_flag, cs_idx, repeat;
struct stdio_dev **cons_set, **old_set;
struct stdio_dev *dev;
console_args = strdup(arg);
if (console_args == NULL)
return 1;
/*
* Check whether a comma separated list of devices was
* entered and count how many devices were entered.
* The array start[] has pointers to the beginning of
* each device name (up to MAX_CONSARGS devices).
*
* Have to do this twice - once to count the number of
* commas and then again to populate start.
*/
i = 0;
temp = console_args;
for (;;) {
/* There's always one entry more than the number of commas. */
i++;
temp = strchr(temp, ',');
if (temp == NULL)
break;
temp++;
}
start = (char **)malloc(i * sizeof(char *));
if (start == NULL) {
free(console_args);
return 1;
}
i = 0;
start[0] = console_args;
for (;;) {
temp = strchr(start[i++], ',');
if (temp == NULL)
break;
*temp = '\0';
start[i] = temp + 1;
}
cons_set = (struct stdio_dev **)calloc(i, sizeof(struct stdio_dev *));
if (cons_set == NULL) {
free(start);
free(console_args);
return 1;
}
io_flag = stdio_file_to_flags(console);
if (io_flag < 0) {
free(start);
free(console_args);
free(cons_set);
return 1;
}
cs_idx = 0;
for (j = 0; j < i; j++) {
/*
* Check whether the device exists and is valid.
* console_assign() also calls console_search_dev(),
* but I need the pointer to the device.
*/
dev = console_search_dev(io_flag, start[j]);
if (dev == NULL)
continue;
/*
* Prevent multiple entries for a device.
*/
repeat = iomux_match_device(cons_set, cs_idx, dev);
if (repeat >= 0)
continue;
/*
* Try assigning the specified device.
* This could screw up the console settings for apps.
*/
if (console_assign(console, start[j]) < 0)
continue;
cons_set[cs_idx++] = dev;
}
free(console_args);
free(start);
/* failed to set any console */
if (cs_idx == 0) {
free(cons_set);
return 1;
}
old_set = console_devices[console];
repeat = cd_count[console];
console_devices[console] = cons_set;
cd_count[console] = cs_idx;
/* Stop dropped consoles */
for (i = 0; i < repeat; i++) {
j = iomux_match_device(cons_set, cs_idx, old_set[i]);
if (j == cs_idx)
console_stop(console, old_set[i]);
}
free(old_set);
return 0;
}
int iomux_replace_device(const int console, const char *old, const char *new)
{
struct stdio_dev *dev;
char *arg = NULL; /* Initial empty list */
int size = 1; /* For NUL terminator */
int i, ret;
for_each_console_dev(i, console, dev) {
const char *name = strcmp(dev->name, old) ? dev->name : new;
char *tmp;
/* Append name with a ',' (comma) separator */
tmp = realloc(arg, size + strlen(name) + 1);
if (!tmp) {
free(arg);
return -ENOMEM;
}
if (arg) {
strcat(tmp, ",");
strcat(tmp, name);
}
else
strcpy(tmp, name);
arg = tmp;
size = strlen(tmp) + 1;
}
ret = iomux_doenv(console, arg);
if (ret)
ret = -EINVAL;
free(arg);
return ret;
}
#endif /* CONSOLE_MUX */
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