172 lines
4.3 KiB
C
172 lines
4.3 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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#include <gpio.h>
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static int do_gpio_get_value(int argc, char *argv[])
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{
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int gpio, value;
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if (argc < 2)
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return COMMAND_ERROR_USAGE;
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gpio = simple_strtoul(argv[1], NULL, 0);
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value = gpio_get_value(gpio);
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if (value < 0)
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return 1;
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return value;
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}
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BAREBOX_CMD_START(gpio_get_value)
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.cmd = do_gpio_get_value,
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BAREBOX_CMD_DESC("return value of a GPIO pin")
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BAREBOX_CMD_OPTS("GPIO")
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BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
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BAREBOX_CMD_END
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static int do_gpio_set_value(int argc, char *argv[])
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{
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int gpio, value;
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if (argc < 3)
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return COMMAND_ERROR_USAGE;
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gpio = simple_strtoul(argv[1], NULL, 0);
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value = simple_strtoul(argv[2], NULL, 0);
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gpio_set_value(gpio, value);
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return 0;
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}
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BAREBOX_CMD_START(gpio_set_value)
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.cmd = do_gpio_set_value,
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BAREBOX_CMD_DESC("set a GPIO's output value")
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BAREBOX_CMD_OPTS("GPIO VALUE")
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BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
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BAREBOX_CMD_END
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static int do_gpio_direction_input(int argc, char *argv[])
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{
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int gpio, ret;
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if (argc < 2)
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return COMMAND_ERROR_USAGE;
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gpio = simple_strtoul(argv[1], NULL, 0);
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ret = gpio_direction_input(gpio);
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if (ret)
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return 1;
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return 0;
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}
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BAREBOX_CMD_START(gpio_direction_input)
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.cmd = do_gpio_direction_input,
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BAREBOX_CMD_DESC("set direction of a GPIO pin to input")
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BAREBOX_CMD_OPTS("GPIO")
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BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
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BAREBOX_CMD_END
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static int do_gpio_direction_output(int argc, char *argv[])
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{
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int gpio, value, ret;
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if (argc < 3)
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return COMMAND_ERROR_USAGE;
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gpio = simple_strtoul(argv[1], NULL, 0);
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value = simple_strtoul(argv[2], NULL, 0);
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ret = gpio_direction_output(gpio, value);
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if (ret)
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return 1;
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return 0;
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}
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BAREBOX_CMD_START(gpio_direction_output)
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.cmd = do_gpio_direction_output,
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BAREBOX_CMD_DESC("set direction of a GPIO pin to output")
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BAREBOX_CMD_OPTS("GPIO")
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BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
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BAREBOX_CMD_END
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/**
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* @page gpio_for_users GPIO Handling
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@section regular_gpio General usage information
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These commands are available if the symbol @b CONFIG_GENERIC_GPIO and @b
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CONFIG_CMD_GPIO are enabled in Kconfig.
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@note All gpio related commands take a number to identify the pad. This
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number is architecture dependent and may not directly correlate with the
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pad numbers. Due to this, it is also possible that the numbers changes
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between @b barebox releases.
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@section gpio_dir_out Use Pad as GPIO Output
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@verbatim
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# gpio_direction_output <gpio_no> <initial_value>
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@endverbatim
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- gpio_no: Architecture dependend GPIO number
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- initial_value: Output value
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<p> To avoid glitches on the pad the routines will first set up the
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pad's value and afterwards switch the pad to output (if the silicon is
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able to do so). If the pad is already configured in non-GPIO mode (if
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available), this command may silently fail. </p>
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@section gpio_dir_in Use Pad as GPIO Input
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@verbatim
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# gpio_direction_input <gpio_no>
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@endverbatim
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- gpio_no: Architecture dependent GPIO number
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<p> If the pad is already configured in non-GPIO mode (if available),
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this command may silently fail. </p>
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@section gpio_get_value Read Input Value from GPIO Pin
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@verbatim
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# gpio_get_value <gpio_no>
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@endverbatim
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<p> Reads the current value of a GPIO pin and return the value as a
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shell return code. There is no visible output on stdout. You can check
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the return value by using "echo $?". </p>
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<p> A return code other than '0' or '1' specifies an error code. </p>
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<p> If the pad is not configured in GPIO mode, this command may silently
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fail and return garbage. </p>
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@section gpio_set_value Set Output Value on GPIO Pin
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@verbatim
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# gpio_set_value <gpio_no> <value>
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@endverbatim
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- gpio_no: Architecture dependent GPIO number
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- value: Output value
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<p> Set a new output value on pad with GPIO number \<gpio_no>. </p>
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<p> If the pad is not configured in GPIO-mode, this command may silently
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fail. </p>
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*/
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