Flow control settings for RS232 modems

[Aleksander Morgado]

On Mon, Mar 27, 2017 at 3:52 PM, Carlo Lobrano <c.lobrano at gmail.com> wrote:
> I've got some problems configuring MM for this test. This is the message I
> got just after applying the patch:
>
> ModemManager[28005]: <debug> [1490621030.009049] [mm-base-manager.c:263]
> device_added(): (tty/ttyS0): adding device at sysfs path:
> /sys/devices/pnp0/00:05/tty/ttyS0
> ModemManager[28005]: <debug> [1490621030.009100]
> [kerneldevice/mm-kernel-device-udev.c:474] kernel_device_is_candidate():
> (tty/ttyS0): port's parent platform driver is not whitelisted
>
> I saw the other email about udev rule to whitelist the serial device, but it
> seems I could not get it right.
>
> This is the udevadm info about the serial that responds to AT commands
>
> $ udevadm info --attribute-walk /sys/class/tty/ttyS0
>
> Udevadm info starts with the device specified by the devpath and then
> walks up the chain of parent devices. It prints for every device
> found, all possible attributes in the udev rules key format.
> A rule to match, can be composed by the attributes of the device
> and the attributes from one single parent device.
>
>   looking at device '/devices/pnp0/00:05/tty/ttyS0':
>     KERNEL=="ttyS0"
>     SUBSYSTEM=="tty"
>     DRIVER==""
>
>   looking at parent device '/devices/pnp0/00:05':
>     KERNELS=="00:05"
>     SUBSYSTEMS=="pnp"
>     DRIVERS=="serial"
>     ATTRS{id}=="PNP0501"
>
>   looking at parent device '/devices/pnp0':
>     KERNELS=="pnp0"
>     SUBSYSTEMS==""
>     DRIVERS==""
>
> I tried adding the line
>
>     DRIVERS=="serial", ENV{ID_MM_PLATFORM_DRIVER_PROBE}="1"
>
> to 77-mm-platform-serial-whitelist.rules and reloading the rules, but it
> doesn't seem the correct way to do it.
>
> What am I doing wrong?

Does this work?

# cat <<EOF > /lib/udev/rules.d/78-mm-serial.rules
ACTION!="add|change|move", GOTO="mm_serial_end"
DEVPATH=”/devices/pnp0/00:05/tty/ttyS0” ENV{ID_MM_PLATFORM_DRIVER_PROBE}=”1”
LABEL=”mm_serial_end"
EOF
# udevadm control --reload
# udevadm trigger
// Relaunch MM


-- 
Aleksander
https://aleksander.es