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6801201ee7
Make sure the pin request passed before attempting to use it later on. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
/*
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* Control GPIO pins on the fly
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*
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* Copyright (c) 2008-2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/gpio.h>
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#ifndef name_to_gpio
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#define name_to_gpio(name) simple_strtoul(name, NULL, 10)
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#endif
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enum gpio_cmd {
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GPIO_INPUT,
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GPIO_SET,
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GPIO_CLEAR,
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GPIO_TOGGLE,
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};
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static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int gpio;
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enum gpio_cmd sub_cmd;
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ulong value;
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const char *str_cmd, *str_gpio;
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#ifdef gpio_status
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if (argc == 2 && !strcmp(argv[1], "status")) {
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gpio_status();
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return 0;
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}
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#endif
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if (argc != 3)
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show_usage:
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return cmd_usage(cmdtp);
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str_cmd = argv[1];
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str_gpio = argv[2];
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/* parse the behavior */
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switch (*str_cmd) {
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case 'i': sub_cmd = GPIO_INPUT; break;
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case 's': sub_cmd = GPIO_SET; break;
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case 'c': sub_cmd = GPIO_CLEAR; break;
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case 't': sub_cmd = GPIO_TOGGLE; break;
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default: goto show_usage;
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}
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/* turn the gpio name into a gpio number */
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gpio = name_to_gpio(str_gpio);
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if (gpio < 0)
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goto show_usage;
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/* grab the pin before we tweak it */
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if (gpio_request(gpio, "cmd_gpio")) {
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printf("gpio: requesting pin %u failed\n", gpio);
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return -1;
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}
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/* finally, let's do it: set direction and exec command */
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if (sub_cmd == GPIO_INPUT) {
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gpio_direction_input(gpio);
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value = gpio_get_value(gpio);
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} else {
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switch (sub_cmd) {
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case GPIO_SET: value = 1; break;
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case GPIO_CLEAR: value = 0; break;
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case GPIO_TOGGLE: value = !gpio_get_value(gpio); break;
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default: goto show_usage;
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}
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gpio_direction_output(gpio, value);
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}
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printf("gpio: pin %s (gpio %i) value is %lu\n",
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str_gpio, gpio, value);
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gpio_free(gpio);
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return value;
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}
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U_BOOT_CMD(gpio, 3, 0, do_gpio,
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"input/set/clear/toggle gpio pins",
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"<input|set|clear|toggle> <pin>\n"
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" - input/set/clear/toggle the specified pin");
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