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[media] v4l2-core: Add support for touch devices

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Some touch controllers send out touch data in a similar way to a
greyscale frame grabber.

Add new device type VFL_TYPE_TOUCH:
- This uses a new device prefix v4l-touch for these devices, to stop
  generic capture software from treating them as webcams. Otherwise,
  touch is treated similarly to video capture.
- Add V4L2_INPUT_TYPE_TOUCH
- Add MEDIA_INTF_T_V4L_TOUCH
- Add V4L2_CAP_TOUCH to indicate device is a touch device

Add formats:
- V4L2_TCH_FMT_DELTA_TD16 for signed 16-bit touch deltas
- V4L2_TCH_FMT_DELTA_TD08 for signed 16-bit touch deltas
- V4L2_TCH_FMT_TU16 for unsigned 16-bit touch data
- V4L2_TCH_FMT_TU08 for unsigned 8-bit touch data

This support will be used by:
- Atmel maXTouch (atmel_mxt_ts)
- Synaptics RMI4.
- sur40

Signed-off-by: Nick Dyer <nick@shmanahar.org>
Tested-by: Chris Healy <cphealy@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Nick Dyer
2016-07-18 18:10:30 -03:00
committed by Mauro Carvalho Chehab
parent aaf578e12e
commit b2fe22d0cf
7 changed files with 58 additions and 9 deletions
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Documentation/media/kapi/v4l2-dev.rst
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@@ -200,6 +200,7 @@ types exist:
- ``VFL_TYPE_VBI``: ``/dev/vbiX`` for vertical blank data (i.e. closed captions, teletext)
- ``VFL_TYPE_RADIO``: ``/dev/radioX`` for radio tuners
- ``VFL_TYPE_SDR``: ``/dev/swradioX`` for Software Defined Radio tuners
- ``VFL_TYPE_TOUCH``: ``/dev/v4l-touchX`` for touch sensors
The last argument gives you a certain amount of control over the device
device node number used (i.e. the X in ``videoX``). Normally you will pass -1