1 /*
2 * Copyright (c) 2015 Christopher Anderson
3 *
4 * Use of this source code is governed by a MIT-style
5 * license that can be found in the LICENSE file or at
6 * https://opensource.org/licenses/MIT
7 */
8
9 #include <dev/gpio.h>
10 #include <lk/console_cmd.h>
11 #include <string.h>
12 #include <stdio.h>
13
14 struct flag_labels {
15 unsigned id;
16 const char *label;
17 };
18
19 struct flag_labels gpio_flag_labels[] = {
20 { GPIO_INPUT, "input" },
21 { GPIO_OUTPUT, "output" },
22 { GPIO_LEVEL, "level" },
23 { GPIO_EDGE, "edge" },
24 { GPIO_RISING, "rising" },
25 { GPIO_FALLING, "falling" },
26 { GPIO_HIGH, "high" },
27 { GPIO_LOW, "low" },
28 { GPIO_PULLUP, "pullup" },
29 { GPIO_PULLDOWN, "pulldown" },
30 };
31
get_flag_value(const char * str)32 static unsigned int get_flag_value(const char *str) {
33 for (unsigned i = 0; i < countof(gpio_flag_labels); i++) {
34 if (!strcmp(str, gpio_flag_labels[i].label)) {
35 return gpio_flag_labels[i].id;
36 }
37 }
38
39 return 0;
40 }
41
42 /* Ideally this would be generic, but different platforms have varying manners of handling gpio
43 * numbers / banks etc. Nvidia uses A-F, ST uses # and ports, Xilinx uses #s and banks. Etc.
44 */
cmd_gpio(int argc,const console_cmd_args * argv)45 static int cmd_gpio(int argc, const console_cmd_args *argv) {
46 if (argc == 4 && !strcmp(argv[1].str,"set")) {
47 unsigned int gpio = argv[2].u;
48 unsigned int value = argv[3].u;
49
50 gpio_set(gpio, value);
51 } else if (argc == 3 && !strcmp(argv[1].str,"get")) {
52 unsigned int gpio = argv[2].u;
53
54 printf("gpio %u: %d\n", gpio, gpio_get(gpio));
55 } else if (argc >= 3 && !strcmp(argv[1].str,"cfg")) {
56 unsigned int gpio = argv[2].u;
57 unsigned int flags = 0;
58
59 for (int i = 3; i < argc; i++) {
60 flags |= get_flag_value(argv[i].str);
61 }
62
63 gpio_config(gpio, flags);
64 } else {
65 printf("gpio set <gpio #> <value>\n");
66 printf("gpio get <gpio #>\n");
67 printf("gpio cfg <gpio #> [flags: ");
68 for (unsigned int i = 0; i < countof(gpio_flag_labels); i++) {
69 printf("%s ", gpio_flag_labels[i].label);
70 }
71 putchar(']');
72 putchar('\n');
73 }
74
75 return 0;
76 }
77 STATIC_COMMAND_START
78 STATIC_COMMAND("gpio", "commands for manipulating system gpios", &cmd_gpio)
79 STATIC_COMMAND_END(gpio);
80