mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-09-07 21:33:24 +09:00
1729615875
The input sub command was missing from the help text, and it didn't show the actual value currently read on the GPIO. This allows people to read the value of input pins. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/*
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* Control GPIO pins on the fly
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*
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* Copyright (c) 2008-2010 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/blackfin.h>
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#include <asm/gpio.h>
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enum {
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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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int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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if (argc == 2 && !strcmp(argv[1], "status")) {
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bfin_gpio_labels();
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return 0;
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}
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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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/* parse the behavior */
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ulong sub_cmd;
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switch (argv[1][0]) {
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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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/* parse the pin with format: [p][port]<#> */
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const char *str_pin = argv[2];
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/* grab the [p]<port> portion */
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ulong port_base;
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if (*str_pin == 'p') ++str_pin;
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switch (*str_pin) {
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#ifdef GPIO_PA0
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case 'a': port_base = GPIO_PA0; break;
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#endif
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#ifdef GPIO_PB0
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case 'b': port_base = GPIO_PB0; break;
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#endif
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#ifdef GPIO_PC0
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case 'c': port_base = GPIO_PC0; break;
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#endif
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#ifdef GPIO_PD0
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case 'd': port_base = GPIO_PD0; break;
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#endif
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#ifdef GPIO_PE0
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case 'e': port_base = GPIO_PE0; break;
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#endif
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#ifdef GPIO_PF0
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case 'f': port_base = GPIO_PF0; break;
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#endif
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#ifdef GPIO_PG0
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case 'g': port_base = GPIO_PG0; break;
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#endif
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#ifdef GPIO_PH0
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case 'h': port_base = GPIO_PH0; break;
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#endif
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#ifdef GPIO_PI0
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case 'i': port_base = GPIO_PI0; break;
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#endif
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#ifdef GPIO_PJ
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case 'j': port_base = GPIO_PJ0; break;
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#endif
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default: goto show_usage;
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}
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/* grab the <#> portion */
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ulong pin = simple_strtoul(str_pin + 1, NULL, 10);
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if (pin > 15)
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goto show_usage;
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/* grab the pin before we tweak it */
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ulong gpio = port_base + pin;
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gpio_request(gpio, "cmd_gpio");
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/* finally, let's do it: set direction and exec command */
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ulong value;
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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 %lu on port %c (gpio %lu) value is %lu\n",
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pin, *str_pin, gpio, value);
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gpio_free(gpio);
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return 0;
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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 output pins",
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"<input|set|clear|toggle> <port><pin>\n"
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" - input/set/clear/toggle the specified pin (e.g. PF10)");
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