blob: 47eee89221fff34bb704a5fc5b6269f72234da19 [file] [log] [blame]
Mike Frysingera972b8d2011-04-03 04:40:46 -04001/*
2 * Control GPIO pins on the fly
3 *
4 * Copyright (c) 2008-2011 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <common.h>
10#include <command.h>
11
12#include <asm/gpio.h>
13
14#ifndef name_to_gpio
15#define name_to_gpio(name) simple_strtoul(name, NULL, 10)
16#endif
17
18enum gpio_cmd {
19 GPIO_INPUT,
20 GPIO_SET,
21 GPIO_CLEAR,
22 GPIO_TOGGLE,
23};
24
25static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
26{
27 int gpio;
28 enum gpio_cmd sub_cmd;
29 ulong value;
30 const char *str_cmd, *str_gpio;
31
32#ifdef gpio_status
33 if (argc == 2 && !strcmp(argv[1], "status")) {
34 gpio_status();
35 return 0;
36 }
37#endif
38
39 if (argc != 3)
40 show_usage:
Simon Glass4c12eeb2011-12-10 08:44:01 +000041 return CMD_RET_USAGE;
Mike Frysingera972b8d2011-04-03 04:40:46 -040042 str_cmd = argv[1];
43 str_gpio = argv[2];
44
45 /* parse the behavior */
46 switch (*str_cmd) {
47 case 'i': sub_cmd = GPIO_INPUT; break;
48 case 's': sub_cmd = GPIO_SET; break;
49 case 'c': sub_cmd = GPIO_CLEAR; break;
50 case 't': sub_cmd = GPIO_TOGGLE; break;
51 default: goto show_usage;
52 }
53
54 /* turn the gpio name into a gpio number */
55 gpio = name_to_gpio(str_gpio);
56 if (gpio < 0)
57 goto show_usage;
58
59 /* grab the pin before we tweak it */
Mike Frysinger68012012011-04-12 03:02:11 -040060 if (gpio_request(gpio, "cmd_gpio")) {
61 printf("gpio: requesting pin %u failed\n", gpio);
62 return -1;
63 }
Mike Frysingera972b8d2011-04-03 04:40:46 -040064
65 /* finally, let's do it: set direction and exec command */
66 if (sub_cmd == GPIO_INPUT) {
67 gpio_direction_input(gpio);
68 value = gpio_get_value(gpio);
69 } else {
70 switch (sub_cmd) {
71 case GPIO_SET: value = 1; break;
72 case GPIO_CLEAR: value = 0; break;
73 case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
74 default: goto show_usage;
75 }
76 gpio_direction_output(gpio, value);
77 }
78 printf("gpio: pin %s (gpio %i) value is %lu\n",
79 str_gpio, gpio, value);
80
81 gpio_free(gpio);
82
83 return value;
84}
85
86U_BOOT_CMD(gpio, 3, 0, do_gpio,
87 "input/set/clear/toggle gpio pins",
88 "<input|set|clear|toggle> <pin>\n"
89 " - input/set/clear/toggle the specified pin");