ports/175860: multimedia/webcamd: expose Wacom via HAL for hotplugging

[Jan Beich]

>Number:         175860
>Category:       ports
>Synopsis:       multimedia/webcamd: expose Wacom via HAL for hotplugging
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 05 12:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Jan Beich
>Release:        FreeBSD 10.0-CURRENT amd64
>Organization:
>Environment:
$ lshal # from ubuntu
udi = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if1_logicaldev_input'
  info.capabilities = {'input', 'input.touchpad'} (string list)
  info.category = 'input'  (string)
  info.parent = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if1'  (string)
  info.product = 'Wacom Bamboo 16FG 4x5 Finger'  (string)
  info.subsystem = 'input'  (string)
  info.udi = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if1_logicaldev_input'  (string)
  input.device = '/dev/input/event16'  (string)
  input.originating_device = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if1'  (string)
  input.product = 'Wacom Bamboo 16FG 4x5 Finger'  (string)
  linux.device_file = '/dev/input/event16'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'input'  (string)
  linux.sysfs_path = '/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.1/input/input16/event16'  (string)

udi = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if0_logicaldev_input'
  info.capabilities = {'input', 'input.tablet'} (string list)
  info.category = 'input'  (string)
  info.parent = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if0'  (string)
  info.product = 'Wacom Bamboo 16FG 4x5 Pen'  (string)
  info.subsystem = 'input'  (string)
  info.udi = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if0_logicaldev_input'  (string)
  input.device = '/dev/input/event15'  (string)
  input.originating_device = '/org/freedesktop/Hal/devices/usb_device_56a_de_noserial_if0'  (string)
  input.product = 'Wacom Bamboo 16FG 4x5 Pen'  (string)
  linux.device_file = '/dev/input/event15'  (string)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'input'  (string)
  linux.sysfs_path = '/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0/input/input15/event15'  (string)

>Description:
ports/166012 improved configuration by automatically attaching webcamd
to every usb interface a Wacom tablet has. This leads to two issues with
static Xserver configuration (xorg.conf).

- depending on the order of initialization /dev/input/eventN may be
  assigned to different interface(s) after re-attaching the tablet

- running Xserver prevents webcamd (cuse) from reclaiming old
  /dev/input/eventN filenames while not picking up new ones
  when the tablet is re-attached

HAL solves both of them by providing enough information to assign the
right device type(s) for X11 driver (stylus, cursor, etc) and making
Xserver open/close device file(s) on attach/detach.

Note, the first issue cannot be worked around with devd symlinks because
cuse events are too scarce to distinguish different interfaces on
different devices, etc.

  !system=DEVFS subsystem=CDEV type=CREATE cdev=input/event0
  !system=DEVFS subsystem=CDEV type=CREATE cdev=input/event1
>How-To-Repeat:
1. create xorg.conf for a tablet
2. startx, xdm, etc
3. detach the tablet
4. attach the tablet
5. notice input from the tablet no longer works
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: