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cmd: gpio: Correct do_gpio() return value

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Use the correct return value in function do_gpio() and update
commands documentation with the return values from command_ret_t enum.

CMD_RET_SUCCESS is returned on command success and CMD_RET_FAILURE is
returned on command failure.

The command was returning the pin value, which caused confusion when
debugging (#define DEBUG).

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Tested-by: Robert Marko <robert.marko@sartura.hr>
This commit is contained in:
Luka Kovacic 2020-01-05 20:10:56 +01:00 committed by Tom Rini
parent 96ff825d31
commit 4dbc107f46
2 changed files with 19 additions and 7 deletions
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22
cmd/gpio.c
View File

@ -223,23 +223,35 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
gpio_direction_output(gpio, value);
}
printf("gpio: pin %s (gpio %u) value is ", str_gpio, gpio);
if (IS_ERR_VALUE(value))
if (IS_ERR_VALUE(value)) {
printf("unknown (ret=%d)\n", value);
else
goto err;
} else {
printf("%d\n", value);
}
if (sub_cmd != GPIOC_INPUT && !IS_ERR_VALUE(value)) {
int nval = gpio_get_value(gpio);
if (IS_ERR_VALUE(nval))
if (IS_ERR_VALUE(nval)) {
printf(" Warning: no access to GPIO output value\n");
else if (nval != value)
goto err;
} else if (nval != value) {
printf(" Warning: value of pin is still %d\n", nval);
goto err;
}
}
if (ret != -EBUSY)
gpio_free(gpio);
return value;
return CMD_RET_SUCCESS;
err:
if (ret != -EBUSY)
gpio_free(gpio);
return CMD_RET_FAILURE;
}
U_BOOT_CMD(gpio, 4, 0, do_gpio,

4
doc/README.commands
View File

@ -83,9 +83,9 @@ argv: Arguments.
Allowable return value are:
CMD_SUCCESS The command was successfully executed.
CMD_RET_SUCCESS The command was successfully executed.
CMD_FAILURE The command failed.
CMD_RET_FAILURE The command failed.
CMD_RET_USAGE The command was called with invalid parameters. This value
leads to the display of the usage string.