4dbc107f4683 ("cmd: gpio: Correct do_gpio() return value") correctly changed the behaviour of the gpio command to return CMD_RET_SUCCESS or CMD_RET_FAILURE, but any existing script which expects the return value to be the pin value is broken by this change.

Reinstate the legacy behaviour for `gpio input` only.

Fixes: 4dbc107f4683 ("cmd: gpio: Correct do_gpio() return value") Signed-off-by: Alex Kiernan alex.kiernan@gmail.com Signed-off-by: Alex Kiernan alex.kiernan@hivehome.com Reviewed-by: Simon Glass sjg@chromium.org ---

Changes in v2: - add test

cmd/gpio.c | 7 ++++++- test/py/tests/test_gpio.py | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 43 insertions(+), 1 deletion(-) create mode 100644 test/py/tests/test_gpio.py

diff --git a/cmd/gpio.c b/cmd/gpio.c index 16c2cebb3d4b..408a942455b5 100644 --- a/cmd/gpio.c +++ b/cmd/gpio.c @@ -248,7 +248,12 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) if (ret != -EBUSY) gpio_free(gpio);

- return CMD_RET_SUCCESS; + /* + * Whilst wrong, the legacy gpio input command returns the pin + * value, or CMD_RET_FAILURE (which is indistinguishable from a + * valid pin value). + */ + return (sub_cmd == GPIOC_INPUT) ? value : CMD_RET_SUCCESS;

err: if (ret != -EBUSY) diff --git a/test/py/tests/test_gpio.py b/test/py/tests/test_gpio.py new file mode 100644 index 000000000000..8c64f686b0ba --- /dev/null +++ b/test/py/tests/test_gpio.py @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: GPL-2.0+ + +import pytest + +@pytest.mark.boardspec('sandbox') +@pytest.mark.buildconfigspec('cmd_gpio') +def test_gpio_input(u_boot_console): + """Test that gpio input correctly returns the value of a gpio pin.""" + + response = u_boot_console.run_command('gpio input 0; echo rc:$?') + expected_response = 'rc:0' + assert(expected_response in response) + response = u_boot_console.run_command('gpio toggle 0; gpio input 0; echo rc:$?') + expected_response = 'rc:1' + assert(expected_response in response) + +@pytest.mark.boardspec('sandbox') +@pytest.mark.buildconfigspec('cmd_gpio') +def test_gpio_exit_statuses(u_boot_console): + """Test that non-input gpio commands correctly return the command + success/failure status.""" + + expected_response = 'rc:0' + response = u_boot_console.run_command('gpio clear 0; echo rc:$?') + assert(expected_response in response) + response = u_boot_console.run_command('gpio set 0; echo rc:$?') + assert(expected_response in response) + response = u_boot_console.run_command('gpio toggle 0; echo rc:$?') + assert(expected_response in response) + response = u_boot_console.run_command('gpio status -a; echo rc:$?') + assert(expected_response in response) + + expected_response = 'rc:1' + response = u_boot_console.run_command('gpio nonexistent-command; echo rc:$?') + assert(expected_response in response) + response = u_boot_console.run_command('gpio input 200; echo rc:$?') + assert(expected_response in response)