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
iomux_printdevs(const int console)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. */
iomux_doenv(const int console,const char * arg)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 */
148