I’ve been trying to configure an antique Wacom serial tablet I got in
the lower oölitic silurian. This one gets its power from the PS/2 mouse
or keyboard socket and transfers data through the serial port. First:
$ udevadm info --path=/sys/class/tty/ttyS0/ --attribute-walk
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/pnp0/00:07/tty/ttyS0':
KERNEL==ttyS0
SUBSYSTEM==tty
DRIVER==
looking at parent device '/devices/pnp0/00:07':
KERNELS==00:07
SUBSYSTEMS==pnp
DRIVERS==serial
ATTRS{id}==PNP0501
looking at parent device '/devices/pnp0':
KERNELS==pnp0
SUBSYSTEMS==
DRIVERS==
The only identifying attribute is PNP0501. So I adjust
/etc/udev/rules.d/65-xorg-wacom.rules:
ACTION==add|change, SUBSYSTEM==pnp, ATTR{id}==WACf*, ENV{NAME}=Serial
Wacom Tablet
ACTION==add|change, SUBSYSTEM==pnp, ATTR{id}==FUJ*,
ENV{NAME}=Serial Wacom Tablet
ACTION==add|change, SUBSYSTEM==pnp, ATTR{id}==PNP0501,
ENV{NAME}=Serial Wacom Tablet
ACTION==add|change, SUBSYSTEMS==pnp, ATTRS{id}==WACf*,
ENV{ID_INPUT}=1, ENV{ID_INPUT_TABLET}=1, ENV{x11_driver}=wacom
ACTION==add|change, SUBSYSTEMS==pnp, ATTRS{id}==FUJ*,
ENV{ID_INPUT}=1, ENV{ID_INPUT_TABLET}=1, ENV{x11_driver}=wacom
ACTION==add|change, SUBSYSTEMS==pnp, ATTRS{id}==PNP0501,
ENV{ID_INPUT}=1, ENV{ID_INPUT_TABLET}=1, ENV{x11_driver}=wacom
Now test:
$ udevadm test /class/tty/ttyS0
…
parse_file: reading '/etc/udev/rules.d/65-xorg-wacom.rules' as rules file
…
parse_file: reading '/lib/udev/rules.d/69-xserver-xorg-input-wacom.rules' as
rules file
…
udev_rules_new: can not read '/etc/udev/rules.d/z80_user.rules'
udev_rules_new: rules use 215040 bytes tokens (17920 * 12 bytes), 35059
bytes buffer
udev_rules_new: temporary index used 57380 bytes (2869 * 20 bytes)
udev_device_new_from_syspath: device 0x217b1800 has devpath
'/devices/pnp0/00:07/tty/ttyS0'
udev_device_new_from_syspath: device 0x217bab70 has devpath
'/devices/pnp0/00:07/tty/ttyS0'
udev_device_read_db: device 0x217bab70 filled with db file data
udev_device_new_from_syspath: device 0x217bac80 has devpath
'/devices/pnp0/00:07'
udev_device_new_from_syspath: device 0x217baf48 has devpath
'/devices/pnp0'
udev_rules_apply_to_event: LINK 'char/4:64' /lib/udev/rules.d/50-udev-
default.rules:4
udev_rules_apply_to_event: GROUP 20 /lib/udev/rules.d/50-udev-
default.rules:15
udev_rules_apply_to_event: RUN 'socket:@/org/freedesktop/hal/udev_event'
/lib/udev/rules.d/90-hal.rules:2
udev_event_execute_rules: no node name set, will use kernel supplied
name 'ttyS0'
udev_device_update_db: created db file for
'/devices/pnp0/00:07/tty/ttyS0' in '/dev/.udev/db/tty:ttyS0'
udev_node_add: creating device node '/dev/ttyS0', devnum=4:64,
mode=0660, uid=0, gid=20
udev_node_mknod: preserve file '/dev/ttyS0', because it has correct
dev_t
node_symlink: preserve already existing symlink '/dev/char/4:64' to
'../ttyS0'
udevadm_test: UDEV_LOG=6
udevadm_test: DEVPATH=/devices/pnp0/00:07/tty/ttyS0
udevadm_test: MAJOR=4
udevadm_test: MINOR=64
udevadm_test: DEVNAME=/dev/ttyS0
udevadm_test: ACTION=add
udevadm_test: SUBSYSTEM=tty
udevadm_test: DEVLINKS=/dev/char/4:64
udevadm_test: ID_INPUT=1
udevadm_test: ID_INPUT_TABLET=1
udevadm_test: x11_driver=wacom
udevadm_test: run: 'socket:@/org/freedesktop/hal/udev_event'
I think I should be expecting more than this.
Now /var/log/Xorg.0.log gives (for example):
(WW) Serial Wacom Tablet: Waited too long for answer (failed after 3 tries).
(WW) Serial Wacom Tablet: Waited too long for answer (failed after 3
tries).
(WW) Serial Wacom Tablet: Waited too long for answer (failed after 3
tries).
(II) Serial Wacom Tablet: serial tablet id 0x90.
(EE) Couldn't init device Serial Wacom Tablet
(II) Serial Wacom Tablet: removing automatically added devices.
(II) UnloadModule: wacom
Not surprisingly the tablet doesn’t work.
--
Serial Tablet PCs not supported in lucid
https://bugs.launchpad.net/bugs/522318
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