projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| a972b8d7 MF |
1 | /* |
| 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 | ||
| 18 | enum gpio_cmd { | |
| 19 | GPIO_INPUT, | |
| 20 | GPIO_SET, | |
| 21 | GPIO_CLEAR, | |
| 22 | GPIO_TOGGLE, | |
| 23 | }; | |
| 24 | ||
| 25 | static 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: | |
| 41 | return cmd_usage(cmdtp); | |
| 42 | 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 */ | |
| 60 | gpio_request(gpio, "cmd_gpio"); | |
| 61 | ||
| 62 | /* finally, let's do it: set direction and exec command */ | |
| 63 | if (sub_cmd == GPIO_INPUT) { | |
| 64 | gpio_direction_input(gpio); | |
| 65 | value = gpio_get_value(gpio); | |
| 66 | } else { | |
| 67 | switch (sub_cmd) { | |
| 68 | case GPIO_SET: value = 1; break; | |
| 69 | case GPIO_CLEAR: value = 0; break; | |
| 70 | case GPIO_TOGGLE: value = !gpio_get_value(gpio); break; | |
| 71 | default: goto show_usage; | |
| 72 | } | |
| 73 | gpio_direction_output(gpio, value); | |
| 74 | } | |
| 75 | printf("gpio: pin %s (gpio %i) value is %lu\n", | |
| 76 | str_gpio, gpio, value); | |
| 77 | ||
| 78 | gpio_free(gpio); | |
| 79 | ||
| 80 | return value; | |
| 81 | } | |
| 82 | ||
| 83 | U_BOOT_CMD(gpio, 3, 0, do_gpio, | |
| 84 | "input/set/clear/toggle gpio pins", | |
| 85 | "<input|set|clear|toggle> <pin>\n" | |
| 86 | " - input/set/clear/toggle the specified pin"); |